stealc | 48bc1d427c46a8e213d03ce347162f3fd2076766ddff3e70bd52b95f967e8e49

General

Target

file.exe
Size

412KB
MD5

199b3fac9ac583cee18d6967a14ad6f4
SHA1

71875ea5dbd2ed7e16b34476e1f05fcbe164603d
SHA256

48bc1d427c46a8e213d03ce347162f3fd2076766ddff3e70bd52b95f967e8e49
SHA512

b00cd6e4fa3764c0a7a9a3c1f2648a49f6281979f7f574fa7639d721c11aa0e8fc2ab0f1d29070bee5f4db20f92bf78104bf0b05bfe6fde2db501e36816bb488
SSDEEP

6144:z2DUGv8rrPDXLU7nUp57KPBOgssDeKBQhkldbUu+fVDF9w9fdtE/fEwqGS:z2xv8rjDT7cWsDVQhkldbEo9VYRS

Score

10^/10

stealc vidar discovery spyware stealer

Malware Config

Extracted

Family

stealc

rc4.plain

Extracted

Family

vidar

C2

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 13 IoCs

stealer

Processes:

resource	yara_rule
behavioral2/memory/2020-1-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2020-4-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2020-5-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2020-6-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2020-7-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2020-17-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2020-18-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2020-26-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2020-27-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2020-43-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2020-44-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2020-58-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2020-59-0x0000000000400000-0x0000000000648000-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
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

Processes:

RegAsm.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-3169499791-3545231813-3156325206-1000\Control Panel\International\Geo\Nation RegAsm.exe
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

Processes:

file.exe

description pid process target process

PID 1560 set thread context of 2020 1560 file.exe RegAsm.exe
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

Processes:

RegAsm.exe

description ioc process

Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString RegAsm.exe
Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

3432 timeout.exe
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

RegAsm.exe

pid process

2020 RegAsm.exe
2020 RegAsm.exe
2020 RegAsm.exe
2020 RegAsm.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-3169499791-3545231813-3156325206-1000\Control Panel\International\Geo\Nation	RegAsm.exe

description	pid	process	target process
PID 1560 set thread context of 2020	1560	file.exe	RegAsm.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	RegAsm.exe

pid	process
3432	timeout.exe

pid	process
2020	RegAsm.exe
2020	RegAsm.exe
2020	RegAsm.exe
2020	RegAsm.exe

Suspicious use of WriteProcessMemory 15 IoCs

Processes:

file.exeRegAsm.execmd.exe

description	pid	process	target process
PID 1560 wrote to memory of 2020	1560	file.exe	RegAsm.exe
PID 1560 wrote to memory of 2020	1560	file.exe	RegAsm.exe
PID 1560 wrote to memory of 2020	1560	file.exe	RegAsm.exe
PID 1560 wrote to memory of 2020	1560	file.exe	RegAsm.exe
PID 1560 wrote to memory of 2020	1560	file.exe	RegAsm.exe
PID 1560 wrote to memory of 2020	1560	file.exe	RegAsm.exe
PID 1560 wrote to memory of 2020	1560	file.exe	RegAsm.exe
PID 1560 wrote to memory of 2020	1560	file.exe	RegAsm.exe
PID 1560 wrote to memory of 2020	1560	file.exe	RegAsm.exe
PID 2020 wrote to memory of 3936	2020	RegAsm.exe	cmd.exe
PID 2020 wrote to memory of 3936	2020	RegAsm.exe	cmd.exe
PID 2020 wrote to memory of 3936	2020	RegAsm.exe	cmd.exe
PID 3936 wrote to memory of 3432	3936	cmd.exe	timeout.exe
PID 3936 wrote to memory of 3432	3936	cmd.exe	timeout.exe
PID 3936 wrote to memory of 3432	3936	cmd.exe	timeout.exe

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1560

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
2⤵
- Checks computer location settings
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2020

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c timeout /t 10 & rd /s /q "C:\ProgramData\FHCAEGCBFHJD" & exit
3⤵
- Suspicious use of WriteProcessMemory
PID:3936

C:\Windows\SysWOW64\timeout.exe
timeout /t 10
4⤵
- Delays execution with timeout.exe
PID:3432

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

4

T1552

Credentials In Files

4

T1552.001

Discovery

Query Registry

3

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Data from Local System

4

T1005

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

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Downloads

memory/1560-0-0x0000000000790000-0x0000000000791000-memory.dmp

Filesize
4KB

Download
memory/2020-1-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2020-4-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2020-5-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2020-6-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2020-7-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2020-9-0x000000001B3B0000-0x000000001B60F000-memory.dmp

Filesize
2.4MB

Download
memory/2020-17-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2020-18-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2020-26-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2020-27-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2020-43-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2020-44-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2020-58-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2020-59-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads