acrstealer | 161056d20300a822c8d5ef2db367974946e979737dfd7d3abb6734bd5b744793

Analysis

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

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
20/08/2026, 08:32

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General

Target
161056d20300a822c8d5ef2db367974946e979737dfd7d3abb6734bd5b744793.bin.dll
Size 6.2MB
Sample260820-kfhhyscc56
SHA256 161056d20300a822c8d5ef2db367974946e979737dfd7d3abb6734bd5b744793
MD5 31dad99dac2969d30601b88b324851ae
SHA1 4c5618d89d7bf5de75bccc2ae0f912673ceb4083
SHA512 7d024a92a52432e44aa9b1fb9b9d36362954a8d00b6871de93074f4ad959b7cc693f178932f5016079fd818df12e072f896869480b3afdaa3ffa3b68b3d39176
SSDEEP 49152:MyYA9CnyXoSLFJP9p52UVHO7crGnAd2qDO7V2Tg+rRXWuauJyeAcW2:6KCyYSpJHZJpTlN/MqR
TLSH
T1CB66B63697211416E86FC0BE7972F7CCD47D746053A5A9B524A43AFE0C1AE3DABC810E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery acrstealer stealer

Malware Config

Signatures

Family: ACR stealer,GrMsk
ACR stealer (aka GrMsk stealer) is an infostealer written in C++.
stealer acrstealer

Detects ACRStealer V4.x 1 IoCs

resource	yara_rule
behavioral2/files/0x000b000000000441-6.dat	family_acrstealer_v3

Loads dropped DLL 1 IoCs

pid	Process
4296	explorer.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
4296	explorer.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 5300 set thread context of 4296	5300	rundll32.exe	90

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

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
4296	explorer.exe
4296	explorer.exe
4296	explorer.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 4588 wrote to memory of 5300	4588	rundll32.exe	89
PID 5300 wrote to memory of 4296	5300	rundll32.exe	90

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\161056d20300a822c8d5ef2db367974946e979737dfd7d3abb6734bd5b744793.bin.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:4588
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\161056d20300a822c8d5ef2db367974946e979737dfd7d3abb6734bd5b744793.bin.dll,#1
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5300
- - C:\Windows\SysWOW64\explorer.exe
    "C:\Windows\SysWOW64\explorer.exe"
    3⤵
    - Loads dropped DLL
    - Suspicious use of NtSetInformationThreadHideFromDebugger
    - Suspicious behavior: EnumeratesProcesses
    PID:4296

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

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

~DF85DB90FBB54F823F.tmp

Path C:\Windows\Temp\~DF85DB90FBB54F823F.tmp
Size 631KB
SHA256 00f8e7e71ddf3a55fa8d9421e9df4361b74e12dad5ac954891f39e125b417dd0
MD5 fba09eeb232790fe1fc23f36a71f255a
SHA1 1be72dbc6656023d8710ff53f5463fdc45317ff7
SHA512 86ae31a23f550783eabf623715a579008f3407f0aa552cbba5408f9267ee4dfc9e8234b8776b936d126f3c13f1e4b9c1f4ba115dbe3dfe6810f34614438a932f
SSDEEP 12288:YGoB9PtF+k2goGHtNosut4K+EUllqu8yQAp2qvcfxu2a2Zj86cJ3N+RGOeNIZ:YhHn+kiGLO4K+Eiqu3xp2qvcfHFC6cSN
TLSH
T12BD48C41EAD383F1EA434972666FF33F9BB26E028D30CADAD7F17951A872341164B191
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4296-9-0x0000000000E10000-0x0000000000E17000-memory.dmp

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memory/5300-0-0x0000000044CD0000-0x0000000044DB5000-memory.dmp

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memory/5300-1-0x0000000044CD0000-0x0000000044DB5000-memory.dmp

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