acrstealer | 68331ffbe79396f872bd31fafcce15c052fcbbde92a0b1ab02555265132da81f

Analysis

max time kernel
148s
max time network
155s
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, 08:00

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General

Target
68331ffbe79396f872bd31fafcce15c052fcbbde92a0b1ab02555265132da81f.bin.dll
Size 6.2MB
Sample260820-jvym2scb47
SHA256 68331ffbe79396f872bd31fafcce15c052fcbbde92a0b1ab02555265132da81f
MD5 4a2460114a784be0db92edb07c757c5b
SHA1 23b4a76b5efa8149f1e45f7e8027a1d4a5d22ae9
SHA512 fe32dca80e99de799c48e845798312f36cd9e84618378ef516ecb2e8e555018167826ecfcebbe10284a3a3b8080eaa1a3803dd5ca1fcccd43582c9d4b3c25f34
SSDEEP 49152:MyYA9CnyXoSLFJP9p52UVHO7crGnAd2qDO7V2Tg+rRXWuauJyeAcWp:6KCyYSpJHZJpTlN/Mq2
TLSH
T14466B63697211416E86FC0BE7972F7CCD47D746053A5A9B524A43AFE0C1AE3DABC810E
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/0x000e00000001c54f-6.dat	family_acrstealer_v3

Loads dropped DLL 1 IoCs

pid	Process
3300	explorer.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
3300	explorer.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4900 set thread context of 3300	4900	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
3300	explorer.exe
3300	explorer.exe
3300	explorer.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 2836 wrote to memory of 4900	2836	rundll32.exe	89
PID 4900 wrote to memory of 3300	4900	rundll32.exe	90

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\68331ffbe79396f872bd31fafcce15c052fcbbde92a0b1ab02555265132da81f.bin.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:2836
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\68331ffbe79396f872bd31fafcce15c052fcbbde92a0b1ab02555265132da81f.bin.dll,#1
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4900
- - C:\Windows\SysWOW64\explorer.exe
    "C:\Windows\SysWOW64\explorer.exe"
    3⤵
    - Loads dropped DLL
    - Suspicious use of NtSetInformationThreadHideFromDebugger
    - Suspicious behavior: EnumeratesProcesses
    PID:3300

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

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Downloads

~DF4CFF33BFFA438625.tmp

Path C:\Windows\Temp\~DF4CFF33BFFA438625.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/3300-10-0x0000000000AC0000-0x0000000000AC7000-memory.dmp

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memory/4900-1-0x0000000044CD0000-0x0000000044DB5000-memory.dmp

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