stealc | a48ea02e282b2b94e1a49a59fdc0b12f771aa384c04c9defefd4d4e205a3475c

General

Target

file.exe
Size

355KB
MD5

861fa3a29b0724f3fcbbc724ed8ed5f6
SHA1

d0d60644308e9ec12b8d3a2c1254470f3a1e816b
SHA256

a48ea02e282b2b94e1a49a59fdc0b12f771aa384c04c9defefd4d4e205a3475c
SHA512

d3891407de6c91fe16e4ef8914d1e0f7aa623ab1d94ad9ad028061d4d17414c12bec4b468e719ba18d5edc4d6e209017843265636106b488f61a9b74708463f4
SSDEEP

6144:0PlPlgMF6peZUqbWi25LsiZqJuul5Rhy4qrZ/IxRKG1jCPDftA93M:09PlgMFg75iflf04q1QDKG1jylAJM

Score

10^/10

stealc vidar discovery spyware stealer

Malware Config

Extracted

Family

stealc

rc4.plain

Signatures

Detect Vidar Stealer 11 IoCs

stealer

Processes:

resource	yara_rule
behavioral2/memory/4760-2-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4760-7-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4760-5-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4760-11-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4760-12-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4760-29-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4760-30-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4760-46-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4760-47-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4760-67-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4760-68-0x0000000000400000-0x0000000000646000-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
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-1-5-21-2539840389-1261165778-1087677076-1000\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 3660 set thread context of 4760 3660 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

2232 timeout.exe
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

RegAsm.exe

pid process

4760 RegAsm.exe
4760 RegAsm.exe
4760 RegAsm.exe
4760 RegAsm.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2539840389-1261165778-1087677076-1000\Control Panel\International\Geo\Nation	RegAsm.exe

description	pid	process	target process
PID 3660 set thread context of 4760	3660	file.exe	RegAsm.exe

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

pid	process
2232	timeout.exe

pid	process
4760	RegAsm.exe
4760	RegAsm.exe
4760	RegAsm.exe
4760	RegAsm.exe

Suspicious use of WriteProcessMemory 21 IoCs

Processes:

file.exeRegAsm.execmd.exe

description	pid	process	target process
PID 3660 wrote to memory of 4804	3660	file.exe	RegAsm.exe
PID 3660 wrote to memory of 4804	3660	file.exe	RegAsm.exe
PID 3660 wrote to memory of 4804	3660	file.exe	RegAsm.exe
PID 3660 wrote to memory of 3032	3660	file.exe	RegAsm.exe
PID 3660 wrote to memory of 3032	3660	file.exe	RegAsm.exe
PID 3660 wrote to memory of 3032	3660	file.exe	RegAsm.exe
PID 3660 wrote to memory of 4760	3660	file.exe	RegAsm.exe
PID 3660 wrote to memory of 4760	3660	file.exe	RegAsm.exe
PID 3660 wrote to memory of 4760	3660	file.exe	RegAsm.exe
PID 3660 wrote to memory of 4760	3660	file.exe	RegAsm.exe
PID 3660 wrote to memory of 4760	3660	file.exe	RegAsm.exe
PID 3660 wrote to memory of 4760	3660	file.exe	RegAsm.exe
PID 3660 wrote to memory of 4760	3660	file.exe	RegAsm.exe
PID 3660 wrote to memory of 4760	3660	file.exe	RegAsm.exe
PID 3660 wrote to memory of 4760	3660	file.exe	RegAsm.exe
PID 4760 wrote to memory of 3512	4760	RegAsm.exe	cmd.exe
PID 4760 wrote to memory of 3512	4760	RegAsm.exe	cmd.exe
PID 4760 wrote to memory of 3512	4760	RegAsm.exe	cmd.exe
PID 3512 wrote to memory of 2232	3512	cmd.exe	timeout.exe
PID 3512 wrote to memory of 2232	3512	cmd.exe	timeout.exe
PID 3512 wrote to memory of 2232	3512	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:3660

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
2⤵
PID:4804

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
2⤵
PID:3032

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:4760

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c timeout /t 10 & rd /s /q "C:\ProgramData\JKJDHDBKEBGH" & exit
3⤵
- Suspicious use of WriteProcessMemory
PID:3512

C:\Windows\SysWOW64\timeout.exe
timeout /t 10
4⤵
- Delays execution with timeout.exe
PID:2232

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

Replay Monitor

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Downloads

memory/3660-0-0x0000000000C00000-0x0000000000C01000-memory.dmp

Filesize
4KB

Download
memory/3660-1-0x0000000000C00000-0x0000000000C01000-memory.dmp

Filesize
4KB

Download
memory/3660-3-0x0000000000C00000-0x0000000000C01000-memory.dmp

Filesize
4KB

Download
memory/4760-2-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4760-7-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4760-5-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4760-11-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4760-12-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4760-14-0x000000001B7A0000-0x000000001B9FF000-memory.dmp

Filesize
2.4MB

Download
memory/4760-29-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4760-30-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4760-46-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4760-47-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4760-67-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4760-68-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download

Analysis

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