9b29cf0680c2e5aacdb36e82ecfbacf130f463eef8a6f1db82de737039d61cb4

Analysis

max time kernel
148s
max time network
114s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
24/08/2026, 11:22

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General

Target
GRSIMWrite4.4.7+/GRCOSEN.dll
Size 40KB
Sample260824-ngxwtafp21
SHA256 9b29cf0680c2e5aacdb36e82ecfbacf130f463eef8a6f1db82de737039d61cb4
MD5 870fd4b395afca1efab9e13852ffe185
SHA1 8f622eaa074e82e1ef922b1ccd7db8675e39d868
SHA512 ebd67b059853f213f6cc83833cb97cda70d7aec19c1827075e0d9acb10e836660decd7cf56b012110e8979f6d9cb76e0b5e5499ddec47f4b0301b0ca4441ce6f
SSDEEP 768:zEdiGFTy6oTVo95tKCqGp1E63/ohelEZthu7v5Pc1oUyHM8/h:mhoTVaKCqGnEiohelEBulqoDs85
TLSH
T15A038E11749086F7E29E963524F5AF3A9B7F892107E148C38F77894A1E32590B63F387
MD5 SHA1 SHA512 SSDEEP TLSH

Score

3^/10

defense_evasion discovery spyware trojan

Malware Config

Signatures

Program crash 1 IoCs

pid	pid_target	Process	procid_target
904	3452	WerFault.exe	89

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe

Modifies system certificate store 2 TTPs 3 IoCs

defense_evasion spyware trojan

Install Root Certificate

T1553.004

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-189034102-168398478-1159367937-1000\SOFTWARE\Microsoft\SystemCertificates\Disallowed\Certificates\303133DFDBE6F9BF921CD04CA0F1DA86B9A6F7D9	rundll32.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-189034102-168398478-1159367937-1000\Software\Microsoft\SystemCertificates\Disallowed\Certificates\303133DFDBE6F9BF921CD04CA0F1DA86B9A6F7D9\Blobudf = f06e062f012b4545e669e79a518de32eef119b0a7fed3d98	rundll32.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-189034102-168398478-1159367937-1000\Software\Microsoft\SystemCertificates\Disallowed\Certificates\303133DFDBE6F9BF921CD04CA0F1DA86B9A6F7D9\Blobudl = f06e062f012b4545e669e79a518de32eef119b0a7fed3d98	rundll32.exe

Suspicious use of WriteProcessMemory 1 IoCs

description	pid	Process	procid_target
PID 2580 wrote to memory of 3452	2580	rundll32.exe	89

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\GRSIMWrite4.4.7+\GRCOSEN.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:2580
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\GRSIMWrite4.4.7+\GRCOSEN.dll,#1
  2⤵
  - System Location Discovery: System Language Discovery
  - Modifies system certificate store
  PID:3452
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 3452 -s 532
    3⤵
    - Program crash
    PID:904

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 3452 -ip 3452
1⤵
PID:2960

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Subvert Trust Controls

T1553

Install Root Certificate

T1553.004

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/3452-0-0x0000000000A30000-0x0000000000A43000-memory.dmp

Download

memory/3452-1-0x0000000000A50000-0x0000000000A68000-memory.dmp