stealc | d9d3d28b7eaeb8602a9e8d2a98d3f48b5f318f4123b637556048bd1e93028f54

Analysis

max time kernel
147s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
21/06/2024, 03:42

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General

Target
#^NeW_PcSetUp_6677_PaS?K?Y#$/Setup.exe
Size 293KB
Sample240621-d9mansxdph
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/1592-21-0x0000000000C00000-0x000000000134B000-memory.dmp	family_vidar_v7
behavioral2/memory/1592-24-0x0000000000C00000-0x000000000134B000-memory.dmp	family_vidar_v7
behavioral2/memory/1592-44-0x0000000000C00000-0x000000000134B000-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
1592	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 2532 set thread context of 3956	2532	Setup.exe	85

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
3824	timeout.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2532	Setup.exe
2532	Setup.exe
3956	more.com
3956	more.com
1592	CUF.au3
1592	CUF.au3

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
2532	Setup.exe
3956	more.com

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2532 wrote to memory of 3956	2532	Setup.exe	85
PID 2532 wrote to memory of 3956	2532	Setup.exe	85
PID 2532 wrote to memory of 3956	2532	Setup.exe	85
PID 2532 wrote to memory of 3956	2532	Setup.exe	85
PID 3956 wrote to memory of 1592	3956	more.com	87
PID 3956 wrote to memory of 1592	3956	more.com	87
PID 3956 wrote to memory of 1592	3956	more.com	87
PID 3956 wrote to memory of 1592	3956	more.com	87
PID 3956 wrote to memory of 1592	3956	more.com	87
PID 1592 wrote to memory of 1976	1592	CUF.au3	90
PID 1592 wrote to memory of 1976	1592	CUF.au3	90
PID 1592 wrote to memory of 1976	1592	CUF.au3	90
PID 1976 wrote to memory of 3824	1976	cmd.exe	92
PID 1976 wrote to memory of 3824	1976	cmd.exe	92
PID 1976 wrote to memory of 3824	1976	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\#^NeW_PcSetUp_6677_PaS_K_Y#$\Setup.exe
"C:\Users\Admin\AppData\Local\Temp\#^NeW_PcSetUp_6677_PaS_K_Y#$\Setup.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2532
- C:\Windows\SysWOW64\more.com
  C:\Windows\SysWOW64\more.com
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:3956
- - 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:1592
  - - 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\CAAAAFBKFIEC" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:1976
    - - C:\Windows\SysWOW64\timeout.exe
        
        timeout /t 10
        5⤵
        Delays execution with timeout.exe
        
        PID:3824

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

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Downloads

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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ad1edc18

Path C:\Users\Admin\AppData\Local\Temp\ad1edc18
Size 6.8MB
SHA256 c101f1a5faf74d88c9c3be7a2bd6ab9535e4da6e8ace6dc152b24385aac17995
MD5 1f54260b7b669ec21312ff58528a39fc
SHA1 4ca2e9504cec144678f24ca41f0e3204b5ae7e57
SHA512 07c1f6b38ddc02a77f334c290bcf9baec52a6ceb3e0fa2fc343a6f2dd52bea945b5399b4bc4ba37357c62a6ea751a22798a76fa324d159dfaa2eb85ecd7955a8
SSDEEP 196608:baKiIS6BhwZDTL/QpLXU4mTPVh2FaI7BGa:bayCXbgLXUvTN0FX1
MD5 SHA1 SHA512 SSDEEP

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memory/1592-21-0x0000000000C00000-0x000000000134B000-memory.dmp

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memory/1592-44-0x0000000000C00000-0x000000000134B000-memory.dmp

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memory/1592-26-0x0000000061E00000-0x0000000061EF3000-memory.dmp

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memory/1592-24-0x0000000000C00000-0x000000000134B000-memory.dmp

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memory/1592-23-0x00007FFDD1270000-0x00007FFDD1465000-memory.dmp

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memory/2532-7-0x0000000074900000-0x0000000074A7B000-memory.dmp

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memory/2532-0-0x0000000074900000-0x0000000074A7B000-memory.dmp

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memory/2532-6-0x0000000074900000-0x0000000074A7B000-memory.dmp

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memory/2532-5-0x0000000074912000-0x0000000074914000-memory.dmp

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memory/2532-1-0x00007FFDD1270000-0x00007FFDD1465000-memory.dmp

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memory/3956-13-0x0000000074900000-0x0000000074A7B000-memory.dmp

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memory/3956-14-0x0000000074900000-0x0000000074A7B000-memory.dmp

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memory/3956-19-0x0000000074900000-0x0000000074A7B000-memory.dmp

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memory/3956-11-0x00007FFDD1270000-0x00007FFDD1465000-memory.dmp

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memory/3956-9-0x0000000074900000-0x0000000074A7B000-memory.dmp

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