acrstealer | ec3a531649e724dc40ba36cd8df9a72dd722e6cda9930ca2847437e0c063d103

Analysis

max time kernel
148s
max time network
139s
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, 08:31

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General

Target
ec3a531649e724dc40ba36cd8df9a72dd722e6cda9930ca2847437e0c063d103.bin.dll
Size 6.2MB
Sample260820-ke3gqsgr71
SHA256 ec3a531649e724dc40ba36cd8df9a72dd722e6cda9930ca2847437e0c063d103
MD5 07acaf862128c3a5d0d12c09386bb921
SHA1 509dab7320845ababfa8d6cb35692ff289a9b047
SHA512 d2bd3fb95e67da225f937885d8f5fbb5743647a9fbaacfd5978a5554c6702af9cdf4405c0962b02e9a3c8f7cdb697f9d7270e7125b4fbbacf2fa10f64ca49797
SSDEEP 49152:MyYA9CnyXoSLFJP9p52UVHO7crGnAd2qDO7V2Tg+rRXWuauJyeAcWE:6KCyYSpJHZJpTlN/MqX
TLSH
T17B66B63697211416E86FC0BE7972F7CCD47D746053A5A9B524A43AFE0C1AE3DABC810E
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/0x000700000000bb41-6.dat	family_acrstealer_v3

Loads dropped DLL 1 IoCs

pid	Process
1860	explorer.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
1860	explorer.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4124 set thread context of 1860	4124	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
1860	explorer.exe
1860	explorer.exe
1860	explorer.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 5708 wrote to memory of 4124	5708	rundll32.exe	89
PID 4124 wrote to memory of 1860	4124	rundll32.exe	90

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\ec3a531649e724dc40ba36cd8df9a72dd722e6cda9930ca2847437e0c063d103.bin.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:5708
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\ec3a531649e724dc40ba36cd8df9a72dd722e6cda9930ca2847437e0c063d103.bin.dll,#1
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4124
- - C:\Windows\SysWOW64\explorer.exe
    "C:\Windows\SysWOW64\explorer.exe"
    3⤵
    - Loads dropped DLL
    - Suspicious use of NtSetInformationThreadHideFromDebugger
    - Suspicious behavior: EnumeratesProcesses
    PID:1860

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

~DF68543CA0F7B7B32B.tmp

Path C:\Windows\Temp\~DF68543CA0F7B7B32B.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/1860-9-0x0000000000B20000-0x0000000000B27000-memory.dmp

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memory/4124-2-0x0000000044CD0000-0x0000000044DB5000-memory.dmp

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