stealc | b8f6af49f1b7231391bade58f10645f6569aae7fbcb0c25afa29d50803cc868d

General

Target

b8f6af49f1b7231391bade58f10645f6569aae7fbcb0c25afa29d50803cc868d.exe
Size

2.4MB
MD5

6d9df364892d88badeb84fd95d5dc5a1
SHA1

f719e48bea82d2db4ba04a027e18e2945339eb1d
SHA256

b8f6af49f1b7231391bade58f10645f6569aae7fbcb0c25afa29d50803cc868d
SHA512

6175ad637569d57728a1cb15182c6970b8274ed27fd9c8ced2d5364e25075d1df223e46f94fb917a51156be18f80ae6eff37245781193fafca343b940f1cfe5e
SSDEEP

49152:wQc81KnB/a/hNT/dRYa8aesY3Ot4N7G/:wDta/hNT/dRn0etD/

Score

10^/10

stealc vidar discovery spyware stealer

Malware Config

Extracted

Family

stealc

rc4.plain

Extracted

Family

vidar

C2

https://t.me/ta904ek

https://steamcommunity.com/profiles/76561199695752269

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 14 IoCs

stealer

resource	yara_rule
behavioral1/memory/4932-2-0x0000000002AA0000-0x0000000002BEC000-memory.dmp	family_vidar_v7
behavioral1/memory/4500-8-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral1/memory/4500-10-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral1/memory/4500-4-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral1/memory/4500-24-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral1/memory/4500-25-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral1/memory/4500-26-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral1/memory/4500-43-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral1/memory/4500-44-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral1/memory/4500-60-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral1/memory/4500-61-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral1/memory/4500-72-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral1/memory/4500-73-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral1/memory/4500-74-0x0000000000400000-0x0000000000649000-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

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-1-5-21-1162180587-977231257-2194346871-1000\Control Panel\International\Geo\Nation	kat4258.tmp

Executes dropped EXE 1 IoCs

pid	Process
4500	kat4258.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
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 4932 set thread context of 4500	4932	b8f6af49f1b7231391bade58f10645f6569aae7fbcb0c25afa29d50803cc868d.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	kat4258.tmp

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1040	timeout.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4500	kat4258.tmp
4500	kat4258.tmp
4500	kat4258.tmp
4500	kat4258.tmp

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4932 wrote to memory of 4500	4932	b8f6af49f1b7231391bade58f10645f6569aae7fbcb0c25afa29d50803cc868d.exe	85
PID 4932 wrote to memory of 4500	4932	b8f6af49f1b7231391bade58f10645f6569aae7fbcb0c25afa29d50803cc868d.exe	85
PID 4932 wrote to memory of 4500	4932	b8f6af49f1b7231391bade58f10645f6569aae7fbcb0c25afa29d50803cc868d.exe	85
PID 4932 wrote to memory of 4500	4932	b8f6af49f1b7231391bade58f10645f6569aae7fbcb0c25afa29d50803cc868d.exe	85
PID 4932 wrote to memory of 4500	4932	b8f6af49f1b7231391bade58f10645f6569aae7fbcb0c25afa29d50803cc868d.exe	85
PID 4932 wrote to memory of 4500	4932	b8f6af49f1b7231391bade58f10645f6569aae7fbcb0c25afa29d50803cc868d.exe	85
PID 4932 wrote to memory of 4500	4932	b8f6af49f1b7231391bade58f10645f6569aae7fbcb0c25afa29d50803cc868d.exe	85
PID 4932 wrote to memory of 4500	4932	b8f6af49f1b7231391bade58f10645f6569aae7fbcb0c25afa29d50803cc868d.exe	85
PID 4500 wrote to memory of 4948	4500	kat4258.tmp	93
PID 4500 wrote to memory of 4948	4500	kat4258.tmp	93
PID 4500 wrote to memory of 4948	4500	kat4258.tmp	93
PID 4948 wrote to memory of 1040	4948	cmd.exe	95
PID 4948 wrote to memory of 1040	4948	cmd.exe	95
PID 4948 wrote to memory of 1040	4948	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\b8f6af49f1b7231391bade58f10645f6569aae7fbcb0c25afa29d50803cc868d.exe
"C:\Users\Admin\AppData\Local\Temp\b8f6af49f1b7231391bade58f10645f6569aae7fbcb0c25afa29d50803cc868d.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4932
- C:\Users\Admin\AppData\Local\Temp\kat4258.tmp
  C:\Users\Admin\AppData\Local\Temp\kat4258.tmp
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:4500
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Users\Admin\AppData\Local\Temp\kat4258.tmp" & rd /s /q "C:\ProgramData\HJDHCFCBGIDG" & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4948
  - - C:\Windows\SysWOW64\timeout.exe
      timeout /t 10
      4⤵
      Delays execution with timeout.exe
      PID:1040

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

3

T1552

Credentials In Files

3

T1552.001

Discovery

Query Registry

3

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Data from Local System

3

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\kat4258.tmp

Filesize
861KB

MD5
66064dbdb70a5eb15ebf3bf65aba254b

SHA1
0284fd320f99f62aca800fb1251eff4c31ec4ed7

SHA256
6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

SHA512
b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

Download Submit
memory/4500-25-0x0000000000400000-0x0000000000649000-memory.dmp

Filesize
2.3MB

Download
memory/4500-61-0x0000000000400000-0x0000000000649000-memory.dmp

Filesize
2.3MB

Download
memory/4500-26-0x0000000000400000-0x0000000000649000-memory.dmp

Filesize
2.3MB

Download
memory/4500-10-0x0000000000400000-0x0000000000649000-memory.dmp

Filesize
2.3MB

Download
memory/4500-28-0x00000000284B0000-0x000000002870F000-memory.dmp

Filesize
2.4MB

Download
memory/4500-4-0x0000000000400000-0x0000000000649000-memory.dmp

Filesize
2.3MB

Download
memory/4500-24-0x0000000000400000-0x0000000000649000-memory.dmp

Filesize
2.3MB

Download
memory/4500-43-0x0000000000400000-0x0000000000649000-memory.dmp

Filesize
2.3MB

Download
memory/4500-8-0x0000000000400000-0x0000000000649000-memory.dmp

Filesize
2.3MB

Download
memory/4500-74-0x0000000000400000-0x0000000000649000-memory.dmp

Filesize
2.3MB

Download
memory/4500-73-0x0000000000400000-0x0000000000649000-memory.dmp

Filesize
2.3MB

Download
memory/4500-44-0x0000000000400000-0x0000000000649000-memory.dmp

Filesize
2.3MB

Download
memory/4500-60-0x0000000000400000-0x0000000000649000-memory.dmp

Filesize
2.3MB

Download
memory/4500-72-0x0000000000400000-0x0000000000649000-memory.dmp

Filesize
2.3MB

Download
memory/4932-2-0x0000000002AA0000-0x0000000002BEC000-memory.dmp

Filesize
1.3MB

Download
memory/4932-0-0x00000000023C0000-0x00000000023C1000-memory.dmp

Filesize
4KB

Download
memory/4932-9-0x0000000000400000-0x0000000000663000-memory.dmp

Filesize
2.4MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads