unix_stealer | a38b6a4e5eb842c3280013d4a235537615c79402b9223f7c6bada563efba6684

Analysis

max time kernel
148s
max time network
152s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
08/09/2026, 19:53

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General

Target
Build.exe
Size 296KB
Sample260908-yl7xpaxsev
SHA256 a38b6a4e5eb842c3280013d4a235537615c79402b9223f7c6bada563efba6684
MD5 10f86008521e0134346dcf9698de249d
SHA1 b76b1ef1953ee7dd42128ac96061d14076693267
SHA512 6f2f13590bea694e870bca3b50e3768a58d753d33e6a6b4028c9e0ff2f55cd7f1da2a7c1f22898f3c786495b226a61d9cfe490c62937fd8525237846a2f00637
SSDEEP 6144:i59IhSQf0Ou8yegCyThvFhIpWbYNoAIIypwC+9bJjU/HIR6pUR:Hh6OTyejyThvFhIpQrAHYR/H7UR
TLSH
T1C9545C0127ED4659F2FF5BF8E4B1212583B1B862F83EDB8F6D4464ED1922740D950BA3
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/4696-0-0x000001F6BC260000-0x000001F6BC2B0000-memory.dmp	family_unixstealer

Clears Windows event logs 1 TTPs 3 IoCs

defense_evasion ransomware

Clear Windows Event Logs

T1070.001

pid	Process
5268	wevtutil.exe
2796	wevtutil.exe
4480	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

Contacts third-party web service commonly abused for C2 1 TTPs 1 IoCs

Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.

Web Service

T1102

flow	ioc
4	discord.com

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
4	ip-api.com

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
1488	cmd.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
2980	timeout.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4696	Build.exe
4696	Build.exe
4696	Build.exe
4696	Build.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	4696	Build.exe
Token: SeSecurityPrivilege	5268	wevtutil.exe
Token: SeBackupPrivilege	5268	wevtutil.exe
Token: SeSecurityPrivilege	4480	wevtutil.exe
Token: SeBackupPrivilege	4480	wevtutil.exe
Token: SeSecurityPrivilege	2796	wevtutil.exe
Token: SeBackupPrivilege	2796	wevtutil.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4696 wrote to memory of 5268	4696	Build.exe	91
PID 4696 wrote to memory of 2796	4696	Build.exe	92
PID 4696 wrote to memory of 4480	4696	Build.exe	93
PID 4696 wrote to memory of 1488	4696	Build.exe	94
PID 1488 wrote to memory of 2980	1488	cmd.exe	99

C:\Users\Admin\AppData\Local\Temp\Build.exe
"C:\Users\Admin\AppData\Local\Temp\Build.exe"
1⤵
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4696
- C:\Windows\SYSTEM32\wevtutil.exe
  "wevtutil.exe" cl System
  2⤵
  - Clears Windows event logs
  - Suspicious use of AdjustPrivilegeToken
  PID:5268
- C:\Windows\SYSTEM32\wevtutil.exe
  "wevtutil.exe" cl Application
  2⤵
  - Clears Windows event logs
  - Suspicious use of AdjustPrivilegeToken
  PID:2796
- C:\Windows\SYSTEM32\wevtutil.exe
  "wevtutil.exe" cl Security
  2⤵
  - Clears Windows event logs
  - Suspicious use of AdjustPrivilegeToken
  PID:4480
- 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:1488
- - C:\Windows\system32\timeout.exe
    timeout /t 3 /nobreak
    3⤵
    - Delays execution with timeout.exe
    PID:2980

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

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

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

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/4696-0-0x000001F6BC260000-0x000001F6BC2B0000-memory.dmp

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memory/4696-1-0x00007FFC827BF000-0x00007FFC827C0000-memory.dmp

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memory/4696-2-0x00007FFC82630000-0x00007FFC82FD4000-memory.dmp

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memory/4696-3-0x00007FFC82630000-0x00007FFC82FD4000-memory.dmp

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memory/4696-4-0x00007FFC82630000-0x00007FFC82FD4000-memory.dmp

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memory/4696-5-0x00007FFC82630000-0x00007FFC82FD4000-memory.dmp

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memory/4696-6-0x00007FFC82630000-0x00007FFC82FD4000-memory.dmp

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memory/4696-106-0x000001F6D6BA0000-0x000001F6D6D6A000-memory.dmp

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memory/4696-120-0x000001F6D6BA0000-0x000001F6D6D6A000-memory.dmp

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memory/4696-122-0x00007FFC82630000-0x00007FFC82FD4000-memory.dmp

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