acrstealer | 85af3530d822a15a8f0de4560357e562003254369600ffa17c272425e1d65102

Analysis

max time kernel
148s
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, 08:32

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General

Target
85af3530d822a15a8f0de4560357e562003254369600ffa17c272425e1d65102.bin.dll
Size 5.9MB
Sample260820-kfegassgpf
SHA256 85af3530d822a15a8f0de4560357e562003254369600ffa17c272425e1d65102
MD5 1d815fadec0539d77aab2e5168f11caf
SHA1 860939373f178e6b3b496f16ca9541d0f80f45d5
SHA512 3ecb965cc1c21b6f835d73fbb1401983ee83de2f83a651b07f8d386d9f82c7eb9b86f6b6dc4355cf0ecfc29c034c59e712a86da427050e35b0366dc4e9fe92ff
SSDEEP 49152:Jzn1wFYShFJl8iBfk/PHf+rfcW2TMUuXhKtyHYwQBScobCgzg9s/LL50kVq1UZNO:MK4lIkiQZfArtm0NInk9aEtxt
TLSH
T112564D222051672EC6A5017E295E775CD3DED912C8BCB06ECD6271D6C4A38632BBF12F
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery acrstealer stealer

Malware Config

Extracted

Family

acrstealer

Version

4.3.3-alpha1

media.barmaidlushness.cc

Decoy

stackpathcdn.com

Attributes

ddrs
https://telegra.ph/String-Methods-08-01
guids
f1575b64-8492-4e8b-b102-4d26e8c70371

019fd857-3f03-755f-9497-110061ed4da0
user_agent
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.2.6187.130 Safari/537.36

xor.hex

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/0x0006000000016b3f-6.dat	family_acrstealer_v3

Loads dropped DLL 1 IoCs

pid	Process
1928	explorer.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
1928	explorer.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1116 set thread context of 1928	1116	rundll32.exe	91

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
1928	explorer.exe
1928	explorer.exe
1928	explorer.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 3724 wrote to memory of 1116	3724	rundll32.exe	89
PID 1116 wrote to memory of 1928	1116	rundll32.exe	91

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\85af3530d822a15a8f0de4560357e562003254369600ffa17c272425e1d65102.bin.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:3724
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\85af3530d822a15a8f0de4560357e562003254369600ffa17c272425e1d65102.bin.dll,#1
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1116
- - C:\Windows\SysWOW64\explorer.exe
    "C:\Windows\SysWOW64\explorer.exe"
    3⤵
    - Loads dropped DLL
    - Suspicious use of NtSetInformationThreadHideFromDebugger
    - Suspicious behavior: EnumeratesProcesses
    PID:1928

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

~DFC736C695DD6B5A7E.tmp

Path C:\Windows\Temp\~DFC736C695DD6B5A7E.tmp
Size 597KB
SHA256 047d4a22451027e6b351b49c0357caa8604ade070332eeeb589c937c6aaa5b24
MD5 841a1056f8846de20673a6b69b22f40d
SHA1 1f6846d9c3872536bbe1b0a370b73215d5795a37
SHA512 b7278b98e975bf9d79aca5bfeba505260b724af79f37dcea5bced0b9643be34223326cdfc32824925cc71870a94fb9ec92c7c351433f674b674f5fa984ad10f7
SSDEEP 12288:R+q3wf3hd61NGDPAgVE6/Kg45t9Sfqyughh5YHtpgm/kkPReCwx0:R+qgPhdON6b7/Kg45t9SfqyuUY7gm/5t
TLSH
T196D49D56DAC280F1EC4399B2332FF73F6B726E068835C9EADBE419559C73761660B081
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1116-1-0x0000000043DA0000-0x0000000043E76000-memory.dmp

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memory/1116-0-0x0000000043DA0000-0x0000000043E76000-memory.dmp

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memory/1928-9-0x0000000000600000-0x0000000000607000-memory.dmp

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