MD5: 691b74fb23ab187078bc20c3689deaf0
SHA1: 9e1d27acd5a13b636a7b2d619b68318c903aff1f
SHA256: 9ff71f969c5b9a96bd0b68c84be7646cdb52f27e4e511e01997132e6022e70be
SSDeep: 12288:P1/aGLDCMNpNAkoSzZWD8ayX2MQCw7D0SP pcOH6zf9D87goS:P1/aGLDCM4D8ayGM PEcO f9DeW
Size: 526697 bytes
File type: EXE
Platform: WIN32
Entropy: Packed
PEID: UPolyXv05_v6
Company: no certificate found
Created at: 2014-02-27 08:41:59
Analyzed on: WindowsXP SP3 32-bit

Summary:

Trojan. A program that appears to do one thing but actually does another (a.k.a. Trojan Horse).

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

HOSTS file anomalies

No changes have been detected.

Rootkit activity

No anomalies have been detected.

Propagation

VersionInfo

No information is available.

PE Sections

Dropped from:

60aabd508cfe263c46f9ae0539a249bf

Downloaded by:

Similar by SSDeep:

Similar by Lavasoft Polymorphic Checker:

URLs

No activity has been detected.

IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)

Traffic

Web Traffic was not found.

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

.text

`.data

.rdata

@.bss

.idata

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

Software\Microsoft\Windows\CurrentVersion\Run

Windows

Operating System

%H:%M:%S

%m/%d/%y

-0123456789

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

RegCloseKey

RegOpenKeyA

ADVAPI32.DLL

KERNEL32.dll

msvcrt.dll

SHELL32.DLL

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.