stealc | 83c0c6ee5015ea0fef17e099e4b8f4ab923009349b6a0571a7fa1cc2502cc8f5

Analysis

max time kernel
51s
max time network
51s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
18/06/2024, 19:25

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General

Target
^@l@tEst_SetUp_2025__P@ssCodE@^/Setup.exe
Size 293KB
Sample240618-x451dayhmk
SHA256 63ec17feda1f0ea80e0dd7b7938fbf7354aedf8d9f4041543afca9a35337f7bf
MD5 d9602ab0e6370519bd54d13d22dd6ef5
SHA1 95a3a7afdb00e1b2a99fddfe5d3203aa5cd4a09d
SHA512 4587ca630bf5e421e48d5ac7f9ac6866000b06a99d89c1ca31c999414a63ba06a6be2e11467c045b0e2cddb21d792342e69977e6abda6e265b91044e2c8007cd
SSDEEP 6144:jFnHaRGVUA2LOPQNk1Ekle0SnYBV+MiySwq+Q+KxwpwF1oPOmYjeTV4jog:ZnHaRPKIk1Ekle0SQq+Q+OwpwnV4g
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

stealc vidar discovery spyware stealer

Malware Config

Extracted

Family

stealc

rc4.plain

Signatures

Detect Vidar Stealer 3 IoCs

stealer

resource	yara_rule
behavioral2/memory/3040-21-0x00000000014C0000-0x0000000001C0C000-memory.dmp	family_vidar_v7
behavioral2/memory/3040-24-0x00000000014C0000-0x0000000001C0C000-memory.dmp	family_vidar_v7
behavioral2/memory/3040-44-0x00000000014C0000-0x0000000001C0C000-memory.dmp	family_vidar_v7

Stealc
Stealc is an infostealer written in C++.
stealer stealc
Vidar
Vidar is an infostealer based on Arkei stealer.
stealer vidar

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation	CUF.au3

Loads dropped DLL 1 IoCs

pid	Process
3040	CUF.au3

Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1988 set thread context of 512	1988	Setup.exe	84

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 1 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	CUF.au3

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4932	timeout.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1988	Setup.exe
1988	Setup.exe
512	more.com
512	more.com
3040	CUF.au3
3040	CUF.au3

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
1988	Setup.exe
512	more.com

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1988 wrote to memory of 512	1988	Setup.exe	84
PID 1988 wrote to memory of 512	1988	Setup.exe	84
PID 1988 wrote to memory of 512	1988	Setup.exe	84
PID 1988 wrote to memory of 512	1988	Setup.exe	84
PID 512 wrote to memory of 3040	512	more.com	86
PID 512 wrote to memory of 3040	512	more.com	86
PID 512 wrote to memory of 3040	512	more.com	86
PID 512 wrote to memory of 3040	512	more.com	86
PID 512 wrote to memory of 3040	512	more.com	86
PID 3040 wrote to memory of 2408	3040	CUF.au3	89
PID 3040 wrote to memory of 2408	3040	CUF.au3	89
PID 3040 wrote to memory of 2408	3040	CUF.au3	89
PID 2408 wrote to memory of 4932	2408	cmd.exe	91
PID 2408 wrote to memory of 4932	2408	cmd.exe	91
PID 2408 wrote to memory of 4932	2408	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\^@l@tEst_SetUp_2025__P@ssCodE@^\Setup.exe
"C:\Users\Admin\AppData\Local\Temp\^@l@tEst_SetUp_2025__P@ssCodE@^\Setup.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1988
- C:\Windows\SysWOW64\more.com
  C:\Windows\SysWOW64\more.com
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:512
- - C:\Users\Admin\AppData\Local\Temp\CUF.au3
    C:\Users\Admin\AppData\Local\Temp\CUF.au3
    3⤵
    - Checks computer location settings
    - Loads dropped DLL
    - Checks processor information in registry
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:3040
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Users\Admin\AppData\Local\Temp\CUF.au3" & rd /s /q "C:\ProgramData\CBAKFCBFHJDH" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2408
    - - C:\Windows\SysWOW64\timeout.exe
        
        timeout /t 10
        5⤵
        Delays execution with timeout.exe
        
        PID:4932

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

9ab7d63f

Path C:\Users\Admin\AppData\Local\Temp\9ab7d63f
Size 6.8MB
SHA256 56217a3109d08038c2e31f366c194e2a4f66c43f92995bcc1e6f38a2a7b0120c
MD5 9f943d9026079c8de2f1e76ea3c7f3bf
SHA1 a5dc5df177e382e2590c830c4f3ddf59a603aec2
SHA512 602b8b122969dd3b3a1610e631cce120409e02e27e74d20b0459bd6731b36d62cdf059bcdc2940f93914580143af186d6fc49a90daec3ef6538ff0577b72b7f9
SSDEEP 196608:baKiHf07PZcMnaD7MZUlFK0WKQfOXPv3vHtFks2w:baHf07xvaD7MZ2FK/EXHvfXv
MD5 SHA1 SHA512 SSDEEP

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CUF.au3

Path C:\Users\Admin\AppData\Local\Temp\CUF.au3
Size 872KB
SHA256 237d1bca6e056df5bb16a1216a434634109478f882d3b1d58344c801d184f95d
MD5 c56b5f0201a3b3de53e561fe76912bfd
SHA1 2a4062e10a5de813f5688221dbeb3f3ff33eb417
SHA512 195b98245bb820085ae9203cdb6d470b749d1f228908093e8606453b027b7d7681ccd7952e30c2f5dd40f8f0b999ccfc60ebb03419b574c08de6816e75710d2c
SSDEEP 12288:6pVWeOV7GtINsegA/hMyyzlcqikvAfcN9b2MyZa31twoPTdFxgawV2M01:6T3E53Myyzl0hMf1tr7Caw8M01
MD5 SHA1 SHA512 SSDEEP

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memory/512-11-0x00007FFE4F5B0000-0x00007FFE4F7A5000-memory.dmp

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memory/512-19-0x0000000074A00000-0x0000000074B7B000-memory.dmp

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memory/512-15-0x0000000074A00000-0x0000000074B7B000-memory.dmp

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memory/512-13-0x0000000074A00000-0x0000000074B7B000-memory.dmp

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memory/512-9-0x0000000074A00000-0x0000000074B7B000-memory.dmp

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memory/1988-7-0x0000000074A00000-0x0000000074B7B000-memory.dmp

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memory/1988-0-0x0000000074A00000-0x0000000074B7B000-memory.dmp

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memory/1988-6-0x0000000074A00000-0x0000000074B7B000-memory.dmp

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memory/1988-5-0x0000000074A12000-0x0000000074A14000-memory.dmp

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memory/1988-1-0x00007FFE4F5B0000-0x00007FFE4F7A5000-memory.dmp

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memory/3040-21-0x00000000014C0000-0x0000000001C0C000-memory.dmp

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memory/3040-23-0x00007FFE4F5B0000-0x00007FFE4F7A5000-memory.dmp

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memory/3040-24-0x00000000014C0000-0x0000000001C0C000-memory.dmp

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memory/3040-26-0x0000000061E00000-0x0000000061EF3000-memory.dmp

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memory/3040-44-0x00000000014C0000-0x0000000001C0C000-memory.dmp

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