unix_stealer | 2ef914a44e5d9a571553062e5348ac75e165976d8e0e8ab592c4edebedb60d18

Analysis

max time kernel
148s
max time network
141s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260911-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
26/10/2026, 00:34

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General

Target
Build.exe
Size 296KB
Sample261026-aw2xesab29
SHA256 2ef914a44e5d9a571553062e5348ac75e165976d8e0e8ab592c4edebedb60d18
MD5 c64b6880943a195a77c12e07eb629552
SHA1 b3973fcc763e36928a61dcc8a7a3056bdeedfed1
SHA512 32bcce59150cc9486f6e54e0e43a4b26d4627ece4c9936bf9dcd3c14db08388db35d90237a17f3c66ff847c071f05c5a65546334c06d281eb22cd7e7596a113a
SSDEEP 6144:i59IhSQf0Ou8yegCyThvFhIpWbYNoAIIypwC+9bJjU/HIR6pUX:Hh6OTyejyThvFhIpQrAHYR/H7UX
TLSH
T1C3545C0127ED465AF2FF5BF8E4B1212583B1B862F83EDB8F6D4464ED1922740D950BA3
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

defense_evasion discovery execution unix_stealer ransomware spyware stealer

Malware Config

Signatures

Family: UnixStealer
UnixStealer is a Windows stealer written in C#.
stealer unix_stealer

Detects UnixStealer payload 1 IoCs

resource	yara_rule
behavioral2/memory/2420-0-0x00000157B5DA0000-0x00000157B5DF0000-memory.dmp	family_unixstealer

Clears Windows event logs 1 TTPs 3 IoCs

defense_evasion ransomware

Clear Windows Event Logs

T1070.001

pid	Process
3516	wevtutil.exe
5500	wevtutil.exe
1156	wevtutil.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials In Files
T1552.001

Looks up external IP address via web service 1 TTPs 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

discovery

Internet Connection Discovery

T1016.001

flow	ioc
1	ip-api.com

Enumerates video capture drivers 2 TTPs 1 IoCs

Queries the legacy Video for Windows capture drivers. This is commonly abused by RATs to check for available webcams on the system before reporting to their C2.

discovery defense_evasion

Peripheral Device Discovery

T1120

Video Capture

T1125

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Drivers32\msvideo9	Build.exe

Browser Information Discovery 1 TTPs
Enumerate browser information.
discovery

Browser Information Discovery
T1217

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
5904	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	Build.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	Build.exe

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\Description\System\CentralProcessor\0	Build.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	Build.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
5956	timeout.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2420	Build.exe
2420	Build.exe
2420	Build.exe
2420	Build.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	2420	Build.exe
Token: SeSecurityPrivilege	5500	wevtutil.exe
Token: SeBackupPrivilege	5500	wevtutil.exe
Token: SeSecurityPrivilege	3516	wevtutil.exe
Token: SeBackupPrivilege	3516	wevtutil.exe
Token: SeSecurityPrivilege	1156	wevtutil.exe
Token: SeBackupPrivilege	1156	wevtutil.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 2420 wrote to memory of 3516	2420	Build.exe	89
PID 2420 wrote to memory of 5500	2420	Build.exe	90
PID 2420 wrote to memory of 1156	2420	Build.exe	91
PID 2420 wrote to memory of 5904	2420	Build.exe	92
PID 5904 wrote to memory of 5956	5904	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\Build.exe
"C:\Users\Admin\AppData\Local\Temp\Build.exe"
1⤵
- Enumerates video capture drivers
- Reads the TCP/IP host and domain name from the registry
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2420
- C:\Windows\SYSTEM32\wevtutil.exe
  "wevtutil.exe" cl System
  2⤵
  - Clears Windows event logs
  - Suspicious use of AdjustPrivilegeToken
  PID:3516
- C:\Windows\SYSTEM32\wevtutil.exe
  "wevtutil.exe" cl Application
  2⤵
  - Clears Windows event logs
  - Suspicious use of AdjustPrivilegeToken
  PID:5500
- C:\Windows\SYSTEM32\wevtutil.exe
  "wevtutil.exe" cl Security
  2⤵
  - Clears Windows event logs
  - Suspicious use of AdjustPrivilegeToken
  PID:1156
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\cleanup.bat""
  2⤵
  - Executes a command shell one-liner
  - Suspicious use of WriteProcessMemory
  PID:5904
- - C:\Windows\system32\timeout.exe
    timeout /t 3 /nobreak
    3⤵
    - Delays execution with timeout.exe
    PID:5956

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Windows Command Shell

T1059.003

Persistence

Privilege Escalation

Defense Evasion

Indicator Removal

T1070

Clear Windows Event Logs

T1070.001

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Browser Information Discovery

T1217

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Data from Local System

T1005

Video Capture

T1125

Command and Control

Exfiltration

Impact

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Downloads

Unix-ADMIN-BF91128.zip

Path C:\ProgramData\Unix8797\Unix-ADMIN-BF91128.zip
Size 529KB
SHA256 a3766e89419ffcebf6a0fd681d0eff319df9242f1cf3f64e8735eaece8222171
MD5 f3abcc5a1d6b37abc2a5d05a8deb7673
SHA1 bc001d4717fc3e03259931b602b45f718640219d
SHA512 af5bfcd575858fb1cc004f5b4f19eb15b191228602e6d61ece0dd88fd698b08ce3f682206fb6da993ee486265bf968977196f453f550cccb6da03d2f72845017
SSDEEP 12288:JNyxGNu3/UGtpQCD4z8tzhIav6zZKCQJStuXATnu:JoZUGtpQz8Uav65QJmS
TLSH
T1E6B423E1038DBA0DDE5188B49851F322A4A26E7FD69989514B33EF3E5BF6F0835136C1
MD5 SHA1 SHA512 SSDEEP TLSH

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cleanup.bat

Path C:\Users\Admin\AppData\Local\Temp\cleanup.bat
Size 145B
SHA256 e96f4b25b92128eab425545a6017c5f890558521dfe5e3a9a23643571259ad10
MD5 72984b305d6936646c60e90688f88410
SHA1 c81d8e2fcd4efe193bbed6672eec517aa7b6693c
SHA512 249bc2d6848233840af36d00aeeedf4d90277f448bc0ebadb736661f45c3385469d824182474d7c8efd5cd7d9684f5af2754d4c66a7e91a97c5065ba37465c30
TLSH
T115C08C0352A78AAC0444A0A70ABA718C907918896E4077D00701C4A8528242EAA82651
MD5 SHA1 SHA512 TLSH

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memory/2420-0-0x00000157B5DA0000-0x00000157B5DF0000-memory.dmp

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memory/2420-1-0x00007FFDD535F000-0x00007FFDD5360000-memory.dmp

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memory/2420-2-0x00007FFDD51D0000-0x00007FFDD5B74000-memory.dmp

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memory/2420-3-0x00007FFDD51D0000-0x00007FFDD5B74000-memory.dmp

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memory/2420-4-0x00007FFDD51D0000-0x00007FFDD5B74000-memory.dmp

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memory/2420-5-0x00007FFDD51D0000-0x00007FFDD5B74000-memory.dmp

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memory/2420-105-0x00007FFDD51D0000-0x00007FFDD5B74000-memory.dmp

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memory/2420-108-0x00007FFDD51D0000-0x00007FFDD5B74000-memory.dmp

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