stealc | 42baf8403c093d3c803e76ef97abb848014baafa333baf57ff04f051e6984a81

General

Target

42baf8403c093d3c803e76ef97abb848014baafa333baf57ff04f051e6984a81.exe
Size

1.9MB
MD5

cc30cd75375f719a1d5dc4cad890306e
SHA1

681eea1f7dfc17583b1c7462e7e7c853b518dadc
SHA256

42baf8403c093d3c803e76ef97abb848014baafa333baf57ff04f051e6984a81
SHA512

63147e48da7fb0382d67aa83941bf111b31971f3b159848b1936c8cca16ec6b2c4767b428ea6d2d76b36e5fda714b6b1453acd019f6b61b945f23a25a7880cc0
SSDEEP

49152:CdKfTn6vqJtTF+TxMoxc1TU+j+dAzGwlrh:CdKfTnRtIuoITsdZ

Score

10^/10

stealc vidar discovery spyware stealer

Malware Config

Extracted

Family

stealc

rc4.plain

Extracted

Family

vidar

C2

https://steamcommunity.com/profiles/76561199689717899

https://t.me/copterwin

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 8 IoCs

stealer

resource	yara_rule
behavioral1/memory/4508-2-0x0000000004060000-0x00000000041A9000-memory.dmp	family_vidar_v7
behavioral1/memory/4436-8-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4436-10-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4436-4-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4436-19-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4436-20-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4436-37-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4436-38-0x0000000000400000-0x0000000000646000-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
4436	kat2F9B.tmp

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
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 4508 set thread context of 4436	4508	42baf8403c093d3c803e76ef97abb848014baafa333baf57ff04f051e6984a81.exe	85

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	kat2F9B.tmp

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4436	kat2F9B.tmp
4436	kat2F9B.tmp

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4508 wrote to memory of 4436	4508	42baf8403c093d3c803e76ef97abb848014baafa333baf57ff04f051e6984a81.exe	85
PID 4508 wrote to memory of 4436	4508	42baf8403c093d3c803e76ef97abb848014baafa333baf57ff04f051e6984a81.exe	85
PID 4508 wrote to memory of 4436	4508	42baf8403c093d3c803e76ef97abb848014baafa333baf57ff04f051e6984a81.exe	85
PID 4508 wrote to memory of 4436	4508	42baf8403c093d3c803e76ef97abb848014baafa333baf57ff04f051e6984a81.exe	85
PID 4508 wrote to memory of 4436	4508	42baf8403c093d3c803e76ef97abb848014baafa333baf57ff04f051e6984a81.exe	85
PID 4508 wrote to memory of 4436	4508	42baf8403c093d3c803e76ef97abb848014baafa333baf57ff04f051e6984a81.exe	85
PID 4508 wrote to memory of 4436	4508	42baf8403c093d3c803e76ef97abb848014baafa333baf57ff04f051e6984a81.exe	85
PID 4508 wrote to memory of 4436	4508	42baf8403c093d3c803e76ef97abb848014baafa333baf57ff04f051e6984a81.exe	85

C:\Users\Admin\AppData\Local\Temp\42baf8403c093d3c803e76ef97abb848014baafa333baf57ff04f051e6984a81.exe
"C:\Users\Admin\AppData\Local\Temp\42baf8403c093d3c803e76ef97abb848014baafa333baf57ff04f051e6984a81.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4508
- C:\Users\Admin\AppData\Local\Temp\kat2F9B.tmp
  C:\Users\Admin\AppData\Local\Temp\kat2F9B.tmp
  2⤵
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  PID:4436

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Query Registry

2

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\kat2F9B.tmp

Filesize
861KB

MD5
66064dbdb70a5eb15ebf3bf65aba254b

SHA1
0284fd320f99f62aca800fb1251eff4c31ec4ed7

SHA256
6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

SHA512
b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

Download Submit
memory/4436-8-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4436-10-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4436-4-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4436-19-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4436-20-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4436-22-0x00000000283F0000-0x000000002864F000-memory.dmp

Filesize
2.4MB

Download
memory/4436-37-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4436-38-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4508-0-0x00000000007C0000-0x00000000007C1000-memory.dmp

Filesize
4KB

Download
memory/4508-2-0x0000000004060000-0x00000000041A9000-memory.dmp

Filesize
1.3MB

Download
memory/4508-9-0x0000000000400000-0x00000000005EC000-memory.dmp

Filesize
1.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads