Gen.Variant.Kazy.488548_3cf6abb049

Dynamic Analysis

Payload

Behaviour	Description
WormAutorun	A worm can spread via removable drives. It writes its executable and creates "autorun.inf" scripts on all removable drives. The autorun script will execute the Trojan's file once a user opens a drive's folder in Windows Explorer.

Process activity

The Trojan creates the following process(es):

vbc.exe:2568
vbc.exe:2680
%original file name%.exe:3672

The Trojan injects its code into the following process(es):

%original file name%.exe:3928

Mutexes

The following mutexes were created/opened:No objects were found.

File activity

The process vbc.exe:2568 makes changes in the file system.

The Trojan creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\holdermail.txt (2 bytes)

The process %original file name%.exe:3672 makes changes in the file system.

The Trojan creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Application Data\Microsoft\JiVlrz.exe (4185 bytes)

The process %original file name%.exe:3928 makes changes in the file system.

The Trojan creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Application Data\pid.txt (4 bytes)
%Documents and Settings%\%current user%\Application Data\WindowsUpdate.exe (4185 bytes)
%System%\wbem\Logs\wbemprox.log (160 bytes)
%Documents and Settings%\%current user%\Application Data\pidloc.txt (39 bytes)

The Trojan deletes the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\holdermail.txt (0 bytes)

Registry activity

The process vbc.exe:2568 makes changes in the system registry.

The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "5D B5 8D FF 3C 28 C1 84 7F 38 B4 B4 1B 72 30 1C"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"AppData" = "%Documents and Settings%\%current user%\Application Data"
"Local AppData" = "%Documents and Settings%\%current user%\Local Settings\Application Data"
"History" = "%Documents and Settings%\%current user%\Local Settings\History"

The process vbc.exe:2680 makes changes in the system registry.

The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "9C 21 64 BA F0 FC FE 7B 02 32 16 B6 70 3B AA FF"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"AppData" = "%Documents and Settings%\%current user%\Application Data"
"Local AppData" = "%Documents and Settings%\%current user%\Local Settings\Application Data"

The process %original file name%.exe:3672 makes changes in the system registry.

The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "B8 27 00 2D 61 DB 67 76 AF 49 BD 39 A9 B4 04 2C"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"AppData" = "%Documents and Settings%\%current user%\Application Data"
"Cache" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files"

To automatically run itself each time Windows is booted, the Trojan adds the following link to its file to the system registry autorun key:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"bSILlzCwXBS" = "%Documents and Settings%\%current user%\Application Data\Microsoft\JiVlrz.exe"

The process %original file name%.exe:3928 makes changes in the system registry.

The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\eappprxy\traceIdentifier]
"Guid" = "5f31090b-d990-4e91-b16d-46121d0255aa"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\QUtil\traceIdentifier]
"Guid" = "8aefce96-4618-42ff-a057-3536aa78233e"

[HKLM\System\CurrentControlSet\Services\Eventlog\Application\ESENT]
"EventMessageFile" = "%System%\ESENT.dll"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"AppData" = "%Documents and Settings%\%current user%\Application Data"
"Local AppData" = "%Documents and Settings%\%current user%\Local Settings\Application Data"

[HKLM\System\CurrentControlSet\Services\Eventlog\Application\ESENT]
"CategoryCount" = "16"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\eappprxy]
"Active" = "1"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\eappcfg\traceIdentifier]
"BitNames" = " Error Unusual Info Debug"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\eappcfg]
"Active" = "1"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common AppData" = "%Documents and Settings%\All Users\Application Data"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\eappprxy\traceIdentifier]
"BitNames" = " Error Unusual Info Debug"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cache" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\eappcfg]
"ControlFlags" = "1"
"LogSessionName" = "stdout"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\QUtil]
"Active" = "1"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
"Hidden" = "1"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\eappprxy]
"LogSessionName" = "stdout"
"ControlFlags" = "1"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\eappcfg\traceIdentifier]
"Guid" = "5f31090b-d990-4e91-b16d-46121d0255aa"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\QUtil\traceIdentifier]
"BitNames" = " Error Unusual Info Debug"

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "CB 4D C4 73 98 B5 C6 1A 31 1B 83 C3 D0 2D 0D EE"

[HKLM\System\CurrentControlSet\Services\Eventlog\Application\ESENT]
"CategoryMessageFile" = "%System%\ESENT.dll"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\QUtil]
"LogSessionName" = "stdout"

[HKLM\System\CurrentControlSet\Services\Eventlog\Application\ESENT]
"TypesSupported" = "7"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\QUtil]
"ControlFlags" = "1"

[HKLM\SOFTWARE\Microsoft\ESENT\Process\3cf6abb0498d73caf7b138a082cd7d97\DEBUG]
"Trace Level" = ""

To automatically run itself each time Windows is booted, the Trojan adds the following link to its file to the system registry autorun key:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"Windows Update" = "%Documents and Settings%\%current user%\Application Data\WindowsUpdate.exe"

The Trojan deletes the following value(s) in system registry:

[HKLM\SOFTWARE\Microsoft\ESENT\Process\3cf6abb0498d73caf7b138a082cd7d97\DEBUG]
"Trace Level"

Dropped PE files

There are no dropped PE files.

HOSTS file anomalies

No changes have been detected.

Rootkit activity

No anomalies have been detected.

Propagation

A worm can spread via removable drives. It writes its executable and creates "autorun.inf" scripts on all removable drives. The autorun script will execute the Trojan's file once a user opens a drive's folder in Windows Explorer.

Removals

Remove it with Ad-Aware

1. Click (here) to download and install Ad-Aware Free Antivirus.
2. Update the definition files.
3. Run a full scan of your computer.

Manual removal*

1. Terminate malicious process(es) (How to End a Process With the Task Manager):

   vbc.exe:2568
   vbc.exe:2680
   %original file name%.exe:3672
   

2. Delete the original Trojan file.
   
3. Delete or disinfect the following files created/modified by the Trojan:

   %Documents and Settings%\%current user%\Local Settings\Temp\holdermail.txt (2 bytes)
   %Documents and Settings%\%current user%\Application Data\Microsoft\JiVlrz.exe (4185 bytes)
   %Documents and Settings%\%current user%\Application Data\pid.txt (4 bytes)
   %Documents and Settings%\%current user%\Application Data\WindowsUpdate.exe (4185 bytes)
   %System%\wbem\Logs\wbemprox.log (160 bytes)
   %Documents and Settings%\%current user%\Application Data\pidloc.txt (39 bytes)

4. Delete the following value(s) in the autorun key (How to Work with System Registry):

   [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   "bSILlzCwXBS" = "%Documents and Settings%\%current user%\Application Data\Microsoft\JiVlrz.exe"
   
   [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   "Windows Update" = "%Documents and Settings%\%current user%\Application Data\WindowsUpdate.exe"

5. Clean the Temporary Internet Files folder, which may contain infected files (How to clean Temporary Internet Files folder).
   
6. Find and delete all copies of the worm's file together with "autorun.inf" scripts on removable drives.
   
7. Reboot the computer.
   

*Manual removal may cause unexpected system behaviour and should be performed at your own risk.

Static Analysis

VersionInfo

Company Name:
Product Name: JiVlrz
Product Version: 2.5.10.54837
Legal Copyright: (c)2014 Jnz68m All Rights Reserved.
Legal Trademarks:
Original Filename: 6239.exe
Internal Name: 6239.exe
File Version: 2.5.10.54837
File Description: JiVlrz
Comments: JiVlrz
Language: English (United States)

Company Name: Product Name: JiVlrzProduct Version: 2.5.10.54837Legal Copyright: (c)2014 Jnz68m All Rights Reserved.Legal Trademarks: Original Filename: 6239.exeInternal Name: 6239.exeFile Version: 2.5.10.54837File Description: JiVlrzComments: JiVlrzLanguage: English (United States)

PE Sections

Name	Virtual Address	Virtual Size	Raw Size	Entropy	Section MD5
.text	8192	581097	581120	5.53652	32abe61571f590f0976597a8144d9ddc
.rsrc	589824	24402	24576	3.74719	44bba85a286527159f50ad2f2edc0fe9
.reloc	614400	12	512	0.070639	ab1feb615a5816a4ab35827d3dccc6ee

Dropped from:

Downloaded by:

Similar by SSDeep:

Similar by Lavasoft Polymorphic Checker:

Network Activity

URLs

URL	IP
hxxp://whatismyipaddress.com/	66.171.248.172
smtp.gmail.com	173.194.76.108

IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)

Traffic

Map

The Trojan connects to the servers at the folowing location(s):

Strings from Dumps