stealc | a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329

Analysis

max time kernel
134s
max time network
299s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
submitted
17/06/2024, 05:08

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General

Target
a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe
Size 435KB
Sample240617-fsx2yszdml
SHA256 a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329
MD5 9e49e965497860a4ea1e4065afad6304
SHA1 aff9631611d09814d7acd75b3ee18b50ea074e2d
SHA512 bdd24dee78518ae709e061ac6f7761f76e59c0013876b5076c2648e6f531f253e5d507dd2629352bd4dd8fad8bacbd4458576a6f451f87ab4db203f97605e06f
SSDEEP 6144:0S1gnkIzWbaEBCS2Ra43A2khln30krfESFDhORgYzUQMnlw9NPNDL5NXPMPvnT2Y:0IgnkIzcRYkrfDXCgYwnlwD1fMPvyaH
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

stealc vidar discovery spyware stealer

Malware Config

Extracted

Family

stealc

rc4.plain

Extracted

Family

vidar

https://t.me/memve4erin
https://steamcommunity.com/profiles/76561199699680841

Attributes

user_agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:129.0) Gecko/20100101 Firefox/129.0

Signatures

Detect Vidar Stealer 9 IoCs

stealer

resource	yara_rule
behavioral2/memory/3028-1-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/3028-4-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/3028-5-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/3028-20-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/3028-21-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/3028-38-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/3028-39-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/3028-51-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/3028-52-0x0000000000400000-0x0000000000648000-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
Downloads MZ/PE file
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
Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
Reads user/profile data of web browsers 2 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
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

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 3080 set thread context of 3028	3080	a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe	77

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

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3784	3080	WerFault.exe	72

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	RegAsm.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3476	timeout.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
3028	RegAsm.exe
3028	RegAsm.exe
3028	RegAsm.exe
3028	RegAsm.exe
3028	RegAsm.exe
3028	RegAsm.exe
3028	RegAsm.exe
3028	RegAsm.exe
3028	RegAsm.exe
3028	RegAsm.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 3080 wrote to memory of 492	3080	a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe	73
PID 3080 wrote to memory of 492	3080	a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe	73
PID 3080 wrote to memory of 492	3080	a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe	73
PID 3080 wrote to memory of 4316	3080	a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe	74
PID 3080 wrote to memory of 4316	3080	a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe	74
PID 3080 wrote to memory of 4316	3080	a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe	74
PID 3080 wrote to memory of 3628	3080	a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe	75
PID 3080 wrote to memory of 3628	3080	a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe	75
PID 3080 wrote to memory of 3628	3080	a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe	75
PID 3080 wrote to memory of 3560	3080	a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe	76
PID 3080 wrote to memory of 3560	3080	a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe	76
PID 3080 wrote to memory of 3560	3080	a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe	76
PID 3080 wrote to memory of 3028	3080	a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe	77
PID 3080 wrote to memory of 3028	3080	a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe	77
PID 3080 wrote to memory of 3028	3080	a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe	77
PID 3080 wrote to memory of 3028	3080	a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe	77
PID 3080 wrote to memory of 3028	3080	a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe	77
PID 3080 wrote to memory of 3028	3080	a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe	77
PID 3080 wrote to memory of 3028	3080	a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe	77
PID 3080 wrote to memory of 3028	3080	a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe	77
PID 3080 wrote to memory of 3028	3080	a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe	77
PID 3028 wrote to memory of 2440	3028	RegAsm.exe	81
PID 3028 wrote to memory of 2440	3028	RegAsm.exe	81
PID 3028 wrote to memory of 2440	3028	RegAsm.exe	81
PID 2440 wrote to memory of 3476	2440	cmd.exe	83
PID 2440 wrote to memory of 3476	2440	cmd.exe	83
PID 2440 wrote to memory of 3476	2440	cmd.exe	83

C:\Users\Admin\AppData\Local\Temp\a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe
"C:\Users\Admin\AppData\Local\Temp\a6aa41c4146d958de74395c388ef2af7cc1b47c381c8d4661130d510143e7329.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3080
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:492
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:4316
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:3628
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:3560
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:3028
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c timeout /t 10 & rd /s /q "C:\ProgramData\AEGHJKJKKJDH" & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2440
  - - C:\Windows\SysWOW64\timeout.exe
      timeout /t 10
      4⤵
      Delays execution with timeout.exe
      PID:3476
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3080 -s 320
  2⤵
  - Program crash
  PID:3784

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

memory/3028-1-0x0000000000400000-0x0000000000648000-memory.dmp

Download

memory/3028-4-0x0000000000400000-0x0000000000648000-memory.dmp

Download

memory/3028-5-0x0000000000400000-0x0000000000648000-memory.dmp

Download

memory/3028-20-0x0000000000400000-0x0000000000648000-memory.dmp

Download

memory/3028-21-0x0000000000400000-0x0000000000648000-memory.dmp

Download

memory/3028-24-0x0000000019030000-0x000000001928F000-memory.dmp

Download

memory/3028-38-0x0000000000400000-0x0000000000648000-memory.dmp

Download

memory/3028-39-0x0000000000400000-0x0000000000648000-memory.dmp

Download

memory/3028-51-0x0000000000400000-0x0000000000648000-memory.dmp

Download

memory/3028-52-0x0000000000400000-0x0000000000648000-memory.dmp

Download

memory/3080-0-0x0000000000FD0000-0x0000000000FD1000-memory.dmp

Download

memory/3080-53-0x0000000000FD0000-0x0000000000FD1000-memory.dmp

Download