stealc | 1caa1790ecbba50f9c8323d5cfe655b2609085cbf3105ebf9edc0466154de668

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
13/06/2024, 19:52

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General

Target
1caa1790ecbba50f9c8323d5cfe655b2609085cbf3105ebf9edc0466154de668.exe
Size 2.1MB
Sample240613-ylteasshmn
SHA256 1caa1790ecbba50f9c8323d5cfe655b2609085cbf3105ebf9edc0466154de668
MD5 f87c89ad77390b1791b0fb25a200afcd
SHA1 80fa0447f0c7d591938e1df89ab340045a193174
SHA512 20251f277c3ef9c9fa7f9025c1e9ce217ec2b90af6f8a0dcbfc5c24abedaca692c7fd3b7b15b19a0f9767d40219b587f2bef348e2d62d37bfa00119f7e816f31
SSDEEP 24576:Ub4m+sws1qLVNMIlJl6DRKbAlcNRfCKJUfMxVVtes12FxwojKr98YGeGG9iO:UZXOjt6DuAwCKJUkxVVChjHZQs
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/r8z0l
https://steamcommunity.com/profiles/76561199698764354

Attributes

user_agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:128.0) Gecko/20100101 Firefox/128.0

Signatures

Detect Vidar Stealer 9 IoCs

stealer

resource	yara_rule
behavioral2/memory/3016-2-0x0000000004000000-0x0000000004110000-memory.dmp	family_vidar_v7
behavioral2/memory/4908-4-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4908-9-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4908-8-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4908-11-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4908-12-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4908-13-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4908-14-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4908-17-0x0000000000400000-0x0000000000648000-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

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-1-5-21-2539840389-1261165778-1087677076-1000\Control Panel\International\Geo\Nation	kat4779.tmp

Executes dropped EXE 1 IoCs

pid	Process
4908	kat4779.tmp

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 3016 set thread context of 4908	3016	1caa1790ecbba50f9c8323d5cfe655b2609085cbf3105ebf9edc0466154de668.exe	80

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	kat4779.tmp

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2720	timeout.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4908	kat4779.tmp
4908	kat4779.tmp

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 3016 wrote to memory of 4908	3016	1caa1790ecbba50f9c8323d5cfe655b2609085cbf3105ebf9edc0466154de668.exe	80
PID 3016 wrote to memory of 4908	3016	1caa1790ecbba50f9c8323d5cfe655b2609085cbf3105ebf9edc0466154de668.exe	80
PID 3016 wrote to memory of 4908	3016	1caa1790ecbba50f9c8323d5cfe655b2609085cbf3105ebf9edc0466154de668.exe	80
PID 3016 wrote to memory of 4908	3016	1caa1790ecbba50f9c8323d5cfe655b2609085cbf3105ebf9edc0466154de668.exe	80
PID 3016 wrote to memory of 4908	3016	1caa1790ecbba50f9c8323d5cfe655b2609085cbf3105ebf9edc0466154de668.exe	80
PID 3016 wrote to memory of 4908	3016	1caa1790ecbba50f9c8323d5cfe655b2609085cbf3105ebf9edc0466154de668.exe	80
PID 3016 wrote to memory of 4908	3016	1caa1790ecbba50f9c8323d5cfe655b2609085cbf3105ebf9edc0466154de668.exe	80
PID 3016 wrote to memory of 4908	3016	1caa1790ecbba50f9c8323d5cfe655b2609085cbf3105ebf9edc0466154de668.exe	80
PID 4908 wrote to memory of 656	4908	kat4779.tmp	82
PID 4908 wrote to memory of 656	4908	kat4779.tmp	82
PID 4908 wrote to memory of 656	4908	kat4779.tmp	82
PID 656 wrote to memory of 2720	656	cmd.exe	84
PID 656 wrote to memory of 2720	656	cmd.exe	84
PID 656 wrote to memory of 2720	656	cmd.exe	84

C:\Users\Admin\AppData\Local\Temp\1caa1790ecbba50f9c8323d5cfe655b2609085cbf3105ebf9edc0466154de668.exe
"C:\Users\Admin\AppData\Local\Temp\1caa1790ecbba50f9c8323d5cfe655b2609085cbf3105ebf9edc0466154de668.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3016
- C:\Users\Admin\AppData\Local\Temp\kat4779.tmp
  C:\Users\Admin\AppData\Local\Temp\kat4779.tmp
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:4908
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Users\Admin\AppData\Local\Temp\kat4779.tmp" & rd /s /q "C:\ProgramData\BGCFBGDHJKFI" & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:656
  - - C:\Windows\SysWOW64\timeout.exe
      timeout /t 10
      4⤵
      Delays execution with timeout.exe
      PID:2720

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

kat4779.tmp

Path C:\Users\Admin\AppData\Local\Temp\kat4779.tmp
Size 861KB
SHA256 6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795
MD5 66064dbdb70a5eb15ebf3bf65aba254b
SHA1 0284fd320f99f62aca800fb1251eff4c31ec4ed7
SHA512 b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f
SSDEEP 24576:o0ESdQpglO1CxDyawn27h+9hrlgKQY9SGcZwCdTp:o0RIglO1CuL9VNcaCd9
MD5 SHA1 SHA512 SSDEEP

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memory/3016-0-0x0000000002280000-0x0000000002281000-memory.dmp

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memory/3016-2-0x0000000004000000-0x0000000004110000-memory.dmp

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memory/3016-10-0x0000000000400000-0x0000000000629000-memory.dmp

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memory/4908-4-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/4908-9-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/4908-8-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/4908-11-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/4908-12-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/4908-13-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/4908-14-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/4908-17-0x0000000000400000-0x0000000000648000-memory.dmp

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