stealc | 42f7ec36e07bca91cfa99c9b5a1643a7674e4af4c93905a993eab902e0bfa70d

General

Target

42f7ec36e07bca91cfa99c9b5a1643a7674e4af4c93905a993eab902e0bfa70d.exe
Size

355KB
MD5

8a848d90a8d7a8c79b80d2dd8d330d9d
SHA1

6694c6e16123598f1665b7c68da40fd342e683fa
SHA256

42f7ec36e07bca91cfa99c9b5a1643a7674e4af4c93905a993eab902e0bfa70d
SHA512

d67683611a368964d4dbc2ed85c9c458e5502cc8fb50608ef184cdb574e55636f800c471f8224b1fe82874175f9802d07a8dacdac5eeb73bd72a35bb7b71d54e
SSDEEP

6144:FHAqyjjclaS6sR38CS0iD7RjPyvB7m2Rx6PLfciHid4Fwem:JAqyjjmK06ByZ7m2yee

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 11 IoCs

stealer

Processes:

resource	yara_rule
behavioral2/memory/2596-2-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2596-5-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2596-7-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2596-11-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2596-12-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2596-29-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2596-30-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2596-46-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2596-47-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2596-61-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2596-62-0x0000000000400000-0x0000000000646000-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

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

Suspicious use of SetThreadContext 1 IoCs

Processes:

42f7ec36e07bca91cfa99c9b5a1643a7674e4af4c93905a993eab902e0bfa70d.exe

description	pid	process	target process
PID 5072 set thread context of 2596	5072	42f7ec36e07bca91cfa99c9b5a1643a7674e4af4c93905a993eab902e0bfa70d.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

2268 timeout.exe
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

RegAsm.exe

pid process

2596 RegAsm.exe
2596 RegAsm.exe
2596 RegAsm.exe
2596 RegAsm.exe

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

pid	process
2268	timeout.exe

pid	process
2596	RegAsm.exe
2596	RegAsm.exe
2596	RegAsm.exe
2596	RegAsm.exe

Suspicious use of WriteProcessMemory 15 IoCs

Processes:

42f7ec36e07bca91cfa99c9b5a1643a7674e4af4c93905a993eab902e0bfa70d.exeRegAsm.execmd.exe

description	pid	process	target process
PID 5072 wrote to memory of 2596	5072	42f7ec36e07bca91cfa99c9b5a1643a7674e4af4c93905a993eab902e0bfa70d.exe	RegAsm.exe
PID 5072 wrote to memory of 2596	5072	42f7ec36e07bca91cfa99c9b5a1643a7674e4af4c93905a993eab902e0bfa70d.exe	RegAsm.exe
PID 5072 wrote to memory of 2596	5072	42f7ec36e07bca91cfa99c9b5a1643a7674e4af4c93905a993eab902e0bfa70d.exe	RegAsm.exe
PID 5072 wrote to memory of 2596	5072	42f7ec36e07bca91cfa99c9b5a1643a7674e4af4c93905a993eab902e0bfa70d.exe	RegAsm.exe
PID 5072 wrote to memory of 2596	5072	42f7ec36e07bca91cfa99c9b5a1643a7674e4af4c93905a993eab902e0bfa70d.exe	RegAsm.exe
PID 5072 wrote to memory of 2596	5072	42f7ec36e07bca91cfa99c9b5a1643a7674e4af4c93905a993eab902e0bfa70d.exe	RegAsm.exe
PID 5072 wrote to memory of 2596	5072	42f7ec36e07bca91cfa99c9b5a1643a7674e4af4c93905a993eab902e0bfa70d.exe	RegAsm.exe
PID 5072 wrote to memory of 2596	5072	42f7ec36e07bca91cfa99c9b5a1643a7674e4af4c93905a993eab902e0bfa70d.exe	RegAsm.exe
PID 5072 wrote to memory of 2596	5072	42f7ec36e07bca91cfa99c9b5a1643a7674e4af4c93905a993eab902e0bfa70d.exe	RegAsm.exe
PID 2596 wrote to memory of 3692	2596	RegAsm.exe	cmd.exe
PID 2596 wrote to memory of 3692	2596	RegAsm.exe	cmd.exe
PID 2596 wrote to memory of 3692	2596	RegAsm.exe	cmd.exe
PID 3692 wrote to memory of 2268	3692	cmd.exe	timeout.exe
PID 3692 wrote to memory of 2268	3692	cmd.exe	timeout.exe
PID 3692 wrote to memory of 2268	3692	cmd.exe	timeout.exe

C:\Users\Admin\AppData\Local\Temp\42f7ec36e07bca91cfa99c9b5a1643a7674e4af4c93905a993eab902e0bfa70d.exe
"C:\Users\Admin\AppData\Local\Temp\42f7ec36e07bca91cfa99c9b5a1643a7674e4af4c93905a993eab902e0bfa70d.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:5072

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:2596

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c timeout /t 10 & rd /s /q "C:\ProgramData\GIJDGCAEBFII" & exit
3⤵
- Suspicious use of WriteProcessMemory
PID:3692

C:\Windows\SysWOW64\timeout.exe
timeout /t 10
4⤵
- Delays execution with timeout.exe
PID:2268

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/2596-11-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2596-14-0x000000001BA20000-0x000000001BC7F000-memory.dmp

Filesize
2.4MB

Download
memory/2596-62-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2596-2-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2596-5-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2596-7-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2596-61-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2596-12-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2596-47-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2596-29-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2596-30-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2596-46-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/5072-0-0x00000000003F0000-0x00000000003F1000-memory.dmp

Filesize
4KB

Download
memory/5072-1-0x00000000003F0000-0x00000000003F1000-memory.dmp

Filesize
4KB

Download
memory/5072-3-0x00000000003F0000-0x00000000003F1000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads