c6079f689a8a692799e84ae1fbb1341d1ee5519e89cc5a622f315da8e651abeb

General

Target

csrts.exe
Size

498KB
MD5

aa877144edcef2e8d5a8d37d7ea0d4b6
SHA1

865fe61d037b67841c36468a9e7af15656621abc
SHA256

3dca9bd1af28bbf348c0562475edd60de2b5a2424e586eaf118909b013054eee
SHA512

300386cf27f163867e5448acb6119ef774d9ebf4e3702ff8ceb578477c583982151f95d21ac0ec2979b72034d51fae244eca37ba60256334cee42926cdcbad6b

Score

8^/10

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
2464	updater.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2361464256-2201551969-2316606395-1000\Control Panel\International\Geo\Nation	updater.exe

Loads dropped DLL 2 IoCs

pid	Process
2464	updater.exe
2464	updater.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

Drops desktop.ini file(s) 1 IoCs

description	ioc	Process
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini	updater.exe

Drops file in Program Files directory 8 IoCs

description	ioc	Process
File opened for modification	C:\Program Files\Mozilla Firefox\Myou.dll	updater.exe
File created	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\A‎c‎r‎o‎R‎d‎3‎2‎.exe	updater.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\A‎c‎r‎o‎R‎d‎3‎2‎.exe	updater.exe
File created	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\Myou.dll	updater.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\Myou.dll	updater.exe
File created	C:\Program Files\Mozilla Firefox\f‎i‎r‎e‎f‎o‎x‎.exe	updater.exe
File opened for modification	C:\Program Files\Mozilla Firefox\f‎i‎r‎e‎f‎o‎x‎.exe	updater.exe
File created	C:\Program Files\Mozilla Firefox\Myou.dll	updater.exe

Drops file in Windows directory 5 IoCs

description	ioc	Process
File created	C:\Windows\Installer\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\S‎C‎_‎R‎e‎a‎d‎e‎r‎.ico	updater.exe
File opened for modification	C:\Windows\Installer\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\S‎C‎_‎R‎e‎a‎d‎e‎r‎.ico	updater.exe
File created	C:\Windows\Installer\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\Myou.dll	updater.exe
File opened for modification	C:\Windows\Installer\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\Myou.dll	updater.exe
File opened for modification	C:\Windows\Debug\WIA\wiatrace.log	mspaint.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1f3427c8-5c10-4210-aa03-2ee45287d668}\Instance	updater.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2464	updater.exe
3800	mspaint.exe
3800	mspaint.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1800	csrts.exe
Token: SeDebugPrivilege	2464	updater.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2464	updater.exe

Suspicious use of SetWindowsHookEx 4 IoCs

pid	Process
3800	mspaint.exe
3800	mspaint.exe
3800	mspaint.exe
3800	mspaint.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1800 wrote to memory of 2464	1800	csrts.exe	69
PID 1800 wrote to memory of 2464	1800	csrts.exe	69
PID 1800 wrote to memory of 2464	1800	csrts.exe	69
PID 1800 wrote to memory of 1900	1800	csrts.exe	70
PID 1800 wrote to memory of 1900	1800	csrts.exe	70
PID 1800 wrote to memory of 1900	1800	csrts.exe	70
PID 2464 wrote to memory of 3112	2464	updater.exe	73
PID 2464 wrote to memory of 3112	2464	updater.exe	73
PID 2464 wrote to memory of 3112	2464	updater.exe	73

C:\Users\Admin\AppData\Local\Temp\csrts.exe
"C:\Users\Admin\AppData\Local\Temp\csrts.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1800
- C:\Users\Admin\AppData\Roaming\updater.exe
  "C:\Users\Admin\AppData\Roaming\updater.exe"
  2⤵
  - Executes dropped EXE
  - Checks computer location settings
  - Loads dropped DLL
  - Drops desktop.ini file(s)
  - Drops file in Program Files directory
  - Drops file in Windows directory
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of WriteProcessMemory
  PID:2464
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\b23aba79-0484-4260-98e6-5f13849138d9.bat" "
    3⤵
    PID:3112
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\62701414-a807-4782-abb9-4bc778f3dfb5.bat" "
  2⤵
  PID:1900

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:3680

C:\Windows\system32\mspaint.exe
"C:\Windows\system32\mspaint.exe" "C:\Users\Admin\Downloads\CompleteInvoke.emf"
1⤵
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
PID:3800

\??\c:\windows\system32\svchost.exe
c:\windows\system32\svchost.exe -k localsystemnetworkrestricted -s DeviceAssociationService
1⤵
PID:1908

C:\Windows\system32\NOTEPAD.EXE
"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Downloads\请阅读我.RSA.txt
1⤵
PID:744

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1800-120-0x0000000005430000-0x00000000054C2000-memory.dmp

Filesize
584KB

Download
memory/1800-115-0x0000000073F6E000-0x0000000073F6F000-memory.dmp

Filesize
4KB

Download
memory/1800-119-0x0000000005850000-0x0000000005D4E000-memory.dmp

Filesize
5.0MB

Download
memory/1800-118-0x00000000029B0000-0x00000000029BE000-memory.dmp

Filesize
56KB

Download
memory/1800-117-0x0000000004F00000-0x0000000004F01000-memory.dmp

Filesize
4KB

Download
memory/1800-116-0x0000000000610000-0x000000000068E000-memory.dmp

Filesize
504KB

Download
memory/2464-128-0x0000000005090000-0x0000000005091000-memory.dmp

Filesize
4KB

Download
memory/2464-127-0x0000000073F6E000-0x0000000073F6F000-memory.dmp

Filesize
4KB

Download
memory/2464-130-0x00000000061C0000-0x00000000061F0000-memory.dmp

Filesize
192KB

Download
memory/2464-131-0x0000000005093000-0x0000000005095000-memory.dmp

Filesize
8KB

Download
memory/2464-132-0x0000000006940000-0x000000000694A000-memory.dmp

Filesize
40KB

Download
memory/2464-133-0x0000000008FD0000-0x0000000008FF2000-memory.dmp

Filesize
136KB

Download

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