acrstealer | a6c42fda8d0e72a52f92c73a83ff7acfe0688a938dd879471c275309bfd03abe

Analysis

max time kernel
150s
max time network
115s
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, 08:33

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General

Target
a6c42fda8d0e72a52f92c73a83ff7acfe0688a938dd879471c275309bfd03abe.bin.dll
Size 5.9MB
Sample260820-kf67bawsay
SHA256 a6c42fda8d0e72a52f92c73a83ff7acfe0688a938dd879471c275309bfd03abe
MD5 3b963b1087cb3984702e2de36e5fba5e
SHA1 97da1429e598240992be7daef9388445d9231ac1
SHA512 0043c193ffcb4b4852dd294e8c48be951a6a70a8f89dce25d5f6be8d9896064cb0a6a154deeb798440976f6a99e7c271891fba10672a0c88b4b69c96778dc503
SSDEEP 49152:8BYvboJtjLjGofSOo8IVhPoCIEdowTrTn0zadrCnpg/oIFzJAcU3LoCIlHggcfaq:I
TLSH
T1EA5609124E5C24A7D1E5C1FD25DA76C8CD9E48289AE877972CD381FCA5CEC2508CA2F7
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/0x000d00000001c65a-6.dat	family_acrstealer_v3

Loads dropped DLL 1 IoCs

pid	Process
4324	explorer.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
4324	explorer.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4996 set thread context of 4324	4996	rundll32.exe	92

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
4324	explorer.exe
4324	explorer.exe
4324	explorer.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 2680 wrote to memory of 4996	2680	rundll32.exe	91
PID 4996 wrote to memory of 4324	4996	rundll32.exe	92

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\a6c42fda8d0e72a52f92c73a83ff7acfe0688a938dd879471c275309bfd03abe.bin.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:2680
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\a6c42fda8d0e72a52f92c73a83ff7acfe0688a938dd879471c275309bfd03abe.bin.dll,#1
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4996
- - C:\Windows\SysWOW64\explorer.exe
    "C:\Windows\SysWOW64\explorer.exe"
    3⤵
    - Loads dropped DLL
    - Suspicious use of NtSetInformationThreadHideFromDebugger
    - Suspicious behavior: EnumeratesProcesses
    PID:4324

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

~DF8B8F405570B25CCF.tmp

Path C:\Windows\Temp\~DF8B8F405570B25CCF.tmp
Size 589KB
SHA256 36f61265af7ef12dbbe86c482d80936855306bf6d8a6feeb6396da348339a419
MD5 8c360c8804116cbcb1a7322267dffc93
SHA1 14c11b9a78c9f9986db211676661349e12489c6e
SHA512 087acd0241a36d687bb741fc199c4b2815892d97cef0cabff8200981764a0795bc37759c51684f6673e93a804005704f48e5e370355e4e21a9aa92abbb383e51
SSDEEP 12288:XxgK6wQU7amMm1MdyLtzaC6EWNLWUUPg3DQyhoe3Ifp5cTrOsFI:XxgK6wQU7amMm1MdStuC6EWNkuvie3w1
TLSH
T126D4AF45EAC380F1ED436871326FF33F6B72AE16C871C9DAE7E19952AD63360161B181
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4324-9-0x0000000000190000-0x0000000000197000-memory.dmp

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memory/4996-1-0x00000000374F0000-0x00000000375CA000-memory.dmp

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