stealc | a55c39a03b0ba1c3640389eb7b3d367cda295f07690525abc16b77ba7af83bef

General

Target

a55c39a03b0ba1c3640389eb7b3d367cda295f07690525abc16b77ba7af83bef.exe
Size

2.1MB
MD5

fb99581f36a92093eaab5a01ffaeeaa3
SHA1

ca1620ddd5d3ea7f3980eb79e4166d7bec9a7b8f
SHA256

a55c39a03b0ba1c3640389eb7b3d367cda295f07690525abc16b77ba7af83bef
SHA512

dd68d9cf891927997b240632206f97a60688c5bdf6401df2acc59307e114df46e698c53aa84a3778107e3022ed12f6b5c5e6ad6521b9f92d1c6941b65b0c9436
SSDEEP

24576:cC/gyrgOo5VvmUfq+Zc1Fsuqf9sRUfMxVVtes12FxwojKr98YGeGGHzqqikY+rPN:c3xbZcjHRUkxVVChjHZQHzqZ+rPlV

Score

10^/10

stealc vidar discovery spyware stealer

Malware Config

Extracted

Family

vidar

C2

https://t.me/g067n

https://steamcommunity.com/profiles/76561199707802586

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 16 IoCs

stealer

resource	yara_rule
behavioral2/memory/3868-2-0x0000000002C50000-0x0000000002D60000-memory.dmp	family_vidar_v7
behavioral2/memory/4628-4-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4628-8-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4628-10-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4628-24-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4628-25-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4628-35-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4628-36-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4628-44-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4628-45-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4628-61-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4628-62-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4628-73-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4628-74-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4628-75-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4628-78-0x0000000000400000-0x0000000000648000-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

Executes dropped EXE 1 IoCs

pid	Process
4628	kat6CF2.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 3868 set thread context of 4628	3868	a55c39a03b0ba1c3640389eb7b3d367cda295f07690525abc16b77ba7af83bef.exe	81

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 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	kat6CF2.tmp
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	kat6CF2.tmp

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2860	timeout.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
4628	kat6CF2.tmp
4628	kat6CF2.tmp
4628	kat6CF2.tmp
4628	kat6CF2.tmp
4628	kat6CF2.tmp
4628	kat6CF2.tmp
4628	kat6CF2.tmp
4628	kat6CF2.tmp

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 3868 wrote to memory of 4628	3868	a55c39a03b0ba1c3640389eb7b3d367cda295f07690525abc16b77ba7af83bef.exe	81
PID 3868 wrote to memory of 4628	3868	a55c39a03b0ba1c3640389eb7b3d367cda295f07690525abc16b77ba7af83bef.exe	81
PID 3868 wrote to memory of 4628	3868	a55c39a03b0ba1c3640389eb7b3d367cda295f07690525abc16b77ba7af83bef.exe	81
PID 3868 wrote to memory of 4628	3868	a55c39a03b0ba1c3640389eb7b3d367cda295f07690525abc16b77ba7af83bef.exe	81
PID 3868 wrote to memory of 4628	3868	a55c39a03b0ba1c3640389eb7b3d367cda295f07690525abc16b77ba7af83bef.exe	81
PID 3868 wrote to memory of 4628	3868	a55c39a03b0ba1c3640389eb7b3d367cda295f07690525abc16b77ba7af83bef.exe	81
PID 3868 wrote to memory of 4628	3868	a55c39a03b0ba1c3640389eb7b3d367cda295f07690525abc16b77ba7af83bef.exe	81
PID 3868 wrote to memory of 4628	3868	a55c39a03b0ba1c3640389eb7b3d367cda295f07690525abc16b77ba7af83bef.exe	81
PID 4628 wrote to memory of 4364	4628	kat6CF2.tmp	84
PID 4628 wrote to memory of 4364	4628	kat6CF2.tmp	84
PID 4628 wrote to memory of 4364	4628	kat6CF2.tmp	84
PID 4364 wrote to memory of 2860	4364	cmd.exe	86
PID 4364 wrote to memory of 2860	4364	cmd.exe	86
PID 4364 wrote to memory of 2860	4364	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\a55c39a03b0ba1c3640389eb7b3d367cda295f07690525abc16b77ba7af83bef.exe
"C:\Users\Admin\AppData\Local\Temp\a55c39a03b0ba1c3640389eb7b3d367cda295f07690525abc16b77ba7af83bef.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3868
- C:\Users\Admin\AppData\Local\Temp\kat6CF2.tmp
  C:\Users\Admin\AppData\Local\Temp\kat6CF2.tmp
  2⤵
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:4628
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\system32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Users\Admin\AppData\Local\Temp\kat6CF2.tmp" & rd /s /q "C:\ProgramData\DAEBKKKEHDHD" & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4364
  - - C:\Windows\SysWOW64\timeout.exe
      timeout /t 10
      4⤵
      Delays execution with timeout.exe
      PID:2860

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

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

3

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\kat6CF2.tmp

Filesize
861KB

MD5
66064dbdb70a5eb15ebf3bf65aba254b

SHA1
0284fd320f99f62aca800fb1251eff4c31ec4ed7

SHA256
6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

SHA512
b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

Download Submit
memory/3868-2-0x0000000002C50000-0x0000000002D60000-memory.dmp

Filesize
1.1MB

Download
memory/3868-0-0x00000000024D0000-0x00000000024D1000-memory.dmp

Filesize
4KB

Download
memory/3868-9-0x0000000000400000-0x0000000000624000-memory.dmp

Filesize
2.1MB

Download
memory/4628-35-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/4628-36-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/4628-8-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/4628-24-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/4628-25-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/4628-27-0x000000002F6A0000-0x000000002F8FF000-memory.dmp

Filesize
2.4MB

Download
memory/4628-4-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/4628-10-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/4628-44-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/4628-45-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/4628-61-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/4628-62-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/4628-73-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/4628-74-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/4628-75-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/4628-78-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download

Analysis

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