Gen.Heur.Minggy.1_691b74fb23

Dynamic Analysis

Payload

No specific payload has been found.

Process activity

The Trojan creates the following process(es):

%original file name%.exe:1736
uyrmk.exe:900

The Trojan injects its code into the following process(es):No processes have been created.

Mutexes

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

File activity

The process %original file name%.exe:1736 makes changes in the file system.

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

%Documents and Settings%\All Users\Application Data\uyrmk.exe (515770 bytes)
%Documents and Settings%\All Users\Application Data\Saaaalamm\Mira.h (512124 bytes)

The process uyrmk.exe:900 makes changes in the file system.

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

C:\AUTOEXEC.BAT .exe (1029784 bytes)
C:\MSDOS.SYS .exe (1029784 bytes)
C:\IO.SYS .exe (1029784 bytes)
C:\boot.ini .exe (1029784 bytes)
%Documents and Settings% .exe (1029784 bytes)
C:\RECYCLER .exe (1029784 bytes)
C:\ntldr .exe (1029784 bytes)
C:\original .exe (1029784 bytes)
C:\totalcmd .exe (1029784 bytes)
C:\NTDETECT.COM .exe (1029784 bytes)
C:\System Volume Information .exe (1029784 bytes)
C:\CONFIG.SYS .exe (1029784 bytes)
C:\marker .exe (1029784 bytes)
%Program Files% .exe (1029784 bytes)
%WinDir% .exe (1029784 bytes)
C:\%original file name%.exe .exe (1029784 bytes)
C:\pagefile.sys .exe (1029784 bytes)

The Trojan deletes the following file(s):

C:\Mirax (0 bytes)
C:\Mirat (0 bytes)
C:\Mirau (0 bytes)
C:\Mirav (0 bytes)
C:\Mirap (0 bytes)
C:\Miras (0 bytes)
C:\Miral (0 bytes)
C:\Miraj (0 bytes)
C:\Mirak (0 bytes)
C:\Mirad (0 bytes)
C:\Mirae (0 bytes)
C:\Miraf (0 bytes)
C:\Mirag (0 bytes)
C:\Mirab (0 bytes)
C:\Mirac (0 bytes)

Registry activity

The process %original file name%.exe:1736 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "93 C2 74 D1 07 88 C8 6C 65 3C 77 57 C5 A3 F7 68"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd73-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd72-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{b98117e8-75ca-11e2-81b2-000c293708fb}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd75-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

The process uyrmk.exe:900 makes changes in the system registry.

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

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

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]
"Microsoft® Windows® Operating System" = "%Documents and Settings%\All Users\Application Data\uyrmk.exe"

Dropped PE files

MD5	File path
618ec723d296fcbb1e27d786419c0025	c:\%original file name%.exe .exe
1fcd8962b4fc56c55fbd653607fe9b18	c:\AUTOEXEC.BAT .exe
072d5ffacb5bec1c38514ffbafb86724	c:\CONFIG.SYS .exe
e801bf9ebf28e963bf8f68535202758f	c:\Documents and Settings .exe
30d5010415bd31dee3e2e7e30de1a5f5	c:\Documents and Settings\All Users\Application Data\Saaaalamm\Mira.h
5c675123890aa2858df76d411c39ddc0	c:\Documents and Settings\All Users\Application Data\uyrmk.exe
84faa3be5aaef64601c8ccc24970ca61	c:\IO.SYS .exe
bf778ab4d227dcdc3e46e8c72c5927d0	c:\MSDOS.SYS .exe
2d4dde1c0c7ea50eba7bd291229484b3	c:\NTDETECT.COM .exe
a374e5808041b1896e8f78ce6ded1b42	c:\Perl .exe
5f8f5b016db9c6a0d5b6653c6857a118	c:\Program Files .exe
a349c94023b4a725fb692e679275c44a	c:\RECYCLER .exe
f0551ce8a7979e22b53630163572aa87	c:\System Volume Information .exe
a3dbdb622dceb776251b7e2816da1c0e	c:\WINDOWS .exe
4d303675ad4946ca682234d07ea84c98	c:\boot.ini .exe
7d50978651d75ac193755acf6900bfa5	c:\marker .exe
2e2fec7d56d00a4c0f55f8e3e899f98e	c:\ntldr .exe
3a8f16a76cc6a0947a82b77382e08b31	c:\original .exe
ed0fde1647ca077d08b4871cbfe6e22d	c:\pagefile.sys .exe
fda5aa32375792a4d7d7336fd49d64ca	c:\totalcmd .exe

HOSTS file anomalies

No changes have been detected.

Rootkit activity

No anomalies have been detected.

Propagation

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):

   %original file name%.exe:1736
   uyrmk.exe:900

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

   %Documents and Settings%\All Users\Application Data\uyrmk.exe (515770 bytes)
   %Documents and Settings%\All Users\Application Data\Saaaalamm\Mira.h (512124 bytes)
   C:\AUTOEXEC.BAT .exe (1029784 bytes)
   C:\MSDOS.SYS .exe (1029784 bytes)
   C:\IO.SYS .exe (1029784 bytes)
   C:\boot.ini .exe (1029784 bytes)
   %Documents and Settings% .exe (1029784 bytes)
   C:\RECYCLER .exe (1029784 bytes)
   C:\ntldr .exe (1029784 bytes)
   C:\original .exe (1029784 bytes)
   C:\totalcmd .exe (1029784 bytes)
   C:\NTDETECT.COM .exe (1029784 bytes)
   C:\System Volume Information .exe (1029784 bytes)
   C:\CONFIG.SYS .exe (1029784 bytes)
   C:\marker .exe (1029784 bytes)
   %Program Files% .exe (1029784 bytes)
   %WinDir% .exe (1029784 bytes)
   C:\%original file name%.exe .exe (1029784 bytes)
   C:\pagefile.sys .exe (1029784 bytes)

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

   [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   "Microsoft® Windows® Operating System" = "%Documents and Settings%\All Users\Application Data\uyrmk.exe"

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

Static Analysis

VersionInfo

No information is available.

No information is available.

PE Sections

Name	Virtual Address	Virtual Size	Raw Size	Entropy	Section MD5
.text	4096	245368	245760	4.21465	8b164ac8ef3742f37830dc1842275667
.data	249856	608	1024	0.488703	6fda88cf7188a8245a53dfde927250fd
.rdata	253952	9384	9728	3.47165	dbe852009dbd077a9976cb0ecfb9aadf
.bss	266240	18576	0	0	d41d8cd98f00b204e9800998ecf8427e
.idata	286720	2212	2560	2.97703	5e5242c565219f3bd33a6568632559dc
.rsrc	290816	26552	26624	4.81839	022d9ab365451d1984da97e7e926a6af

Dropped from:

60aabd508cfe263c46f9ae0539a249bf

Downloaded by:

Similar by SSDeep:

Similar by Lavasoft Polymorphic Checker:

Network Activity

URLs

IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)

Traffic

Map

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

Strings from Dumps

uyrmk.exe_900:

.text

.text

`.data

`.data

.rdata

.rdata

@.bss

@.bss

.idata

.idata

%Documents and Settings%\All Users\Application Data\uyrmk.exe

%Documents and Settings%\All Users\Application Data\uyrmk.exe

Software\Microsoft\Windows\CurrentVersion\Run

Software\Microsoft\Windows\CurrentVersion\Run

Windows

Windows

Operating System

Operating System

%H:%M:%S

%H:%M:%S

%m/%d/%y

%m/%d/%y

-0123456789

-0123456789

%s:%u: failed assertion `%s'

%s:%u: failed assertion `%s'

RegCloseKey

RegCloseKey

RegOpenKeyA

RegOpenKeyA

ADVAPI32.DLL

ADVAPI32.DLL

KERNEL32.dll

KERNEL32.dll

msvcrt.dll

msvcrt.dll

SHELL32.DLL

SHELL32.DLL