stealc | c6b36775bd61e4c4d11d798c6f51deb36f231acc0d6a62370e5fe2cffba86dac

General

Target

c6b36775bd61e4c4d11d798c6f51deb36f231acc0d6a62370e5fe2cffba86dac.exe
Size

1.9MB
MD5

59e32f176072ca4240bb8dca80b1d3bf
SHA1

f67c97822634632e3d33dae8d330762d659055cf
SHA256

c6b36775bd61e4c4d11d798c6f51deb36f231acc0d6a62370e5fe2cffba86dac
SHA512

27f177faae224150faaeb1b855ed958bfbc06ccc6eabeca818c5a571aa864f6b8f9ed020b969792399628cd365d1b554b983d07eca6a29c5c6d2a7d8595c80ed
SSDEEP

49152:CdKfTn6vWJtTF+TxMoxc1TU+j+dAzGwlrh:CdKfTnttIuoITsdZ

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 14 IoCs

stealer

Processes:

resource	yara_rule
behavioral2/memory/4028-1-0x0000000004010000-0x0000000004159000-memory.dmp	family_vidar_v7
behavioral2/memory/3084-4-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/3084-8-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/3084-9-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/3084-16-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/3084-17-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/3084-34-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/3084-35-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/3084-51-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/3084-52-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/3084-63-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/3084-64-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/3084-65-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/3084-68-0x0000000000400000-0x0000000000646000-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
Executes dropped EXE 1 IoCs

Processes:

kat5246.tmp

pid process

3084 kat5246.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 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

pid	process
3084	kat5246.tmp

Suspicious use of SetThreadContext 1 IoCs

Processes:

c6b36775bd61e4c4d11d798c6f51deb36f231acc0d6a62370e5fe2cffba86dac.exe

description	pid	process	target process
PID 4028 set thread context of 3084	4028	c6b36775bd61e4c4d11d798c6f51deb36f231acc0d6a62370e5fe2cffba86dac.exe	kat5246.tmp

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:

kat5246.tmp

description ioc process

Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString kat5246.tmp
Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

5020 timeout.exe
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

kat5246.tmp

pid process

3084 kat5246.tmp
3084 kat5246.tmp
3084 kat5246.tmp
3084 kat5246.tmp

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	kat5246.tmp

pid	process
5020	timeout.exe

pid	process
3084	kat5246.tmp
3084	kat5246.tmp
3084	kat5246.tmp
3084	kat5246.tmp

Suspicious use of WriteProcessMemory 14 IoCs

Processes:

c6b36775bd61e4c4d11d798c6f51deb36f231acc0d6a62370e5fe2cffba86dac.exekat5246.tmpcmd.exe

description	pid	process	target process
PID 4028 wrote to memory of 3084	4028	c6b36775bd61e4c4d11d798c6f51deb36f231acc0d6a62370e5fe2cffba86dac.exe	kat5246.tmp
PID 4028 wrote to memory of 3084	4028	c6b36775bd61e4c4d11d798c6f51deb36f231acc0d6a62370e5fe2cffba86dac.exe	kat5246.tmp
PID 4028 wrote to memory of 3084	4028	c6b36775bd61e4c4d11d798c6f51deb36f231acc0d6a62370e5fe2cffba86dac.exe	kat5246.tmp
PID 4028 wrote to memory of 3084	4028	c6b36775bd61e4c4d11d798c6f51deb36f231acc0d6a62370e5fe2cffba86dac.exe	kat5246.tmp
PID 4028 wrote to memory of 3084	4028	c6b36775bd61e4c4d11d798c6f51deb36f231acc0d6a62370e5fe2cffba86dac.exe	kat5246.tmp
PID 4028 wrote to memory of 3084	4028	c6b36775bd61e4c4d11d798c6f51deb36f231acc0d6a62370e5fe2cffba86dac.exe	kat5246.tmp
PID 4028 wrote to memory of 3084	4028	c6b36775bd61e4c4d11d798c6f51deb36f231acc0d6a62370e5fe2cffba86dac.exe	kat5246.tmp
PID 4028 wrote to memory of 3084	4028	c6b36775bd61e4c4d11d798c6f51deb36f231acc0d6a62370e5fe2cffba86dac.exe	kat5246.tmp
PID 3084 wrote to memory of 1560	3084	kat5246.tmp	cmd.exe
PID 3084 wrote to memory of 1560	3084	kat5246.tmp	cmd.exe
PID 3084 wrote to memory of 1560	3084	kat5246.tmp	cmd.exe
PID 1560 wrote to memory of 5020	1560	cmd.exe	timeout.exe
PID 1560 wrote to memory of 5020	1560	cmd.exe	timeout.exe
PID 1560 wrote to memory of 5020	1560	cmd.exe	timeout.exe

C:\Users\Admin\AppData\Local\Temp\c6b36775bd61e4c4d11d798c6f51deb36f231acc0d6a62370e5fe2cffba86dac.exe
"C:\Users\Admin\AppData\Local\Temp\c6b36775bd61e4c4d11d798c6f51deb36f231acc0d6a62370e5fe2cffba86dac.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4028

C:\Users\Admin\AppData\Local\Temp\kat5246.tmp
C:\Users\Admin\AppData\Local\Temp\kat5246.tmp
2⤵
- Executes dropped EXE
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:3084

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Users\Admin\AppData\Local\Temp\kat5246.tmp" & rd /s /q "C:\ProgramData\FBGCAAAAFBKE" & exit
3⤵
- Suspicious use of WriteProcessMemory
PID:1560

C:\Windows\SysWOW64\timeout.exe
timeout /t 10
4⤵
- Delays execution with timeout.exe
PID:5020

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

4

T1552

Credentials In Files

4

T1552.001

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

4

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\kat5246.tmp
Filesize
861KB

MD5
66064dbdb70a5eb15ebf3bf65aba254b

SHA1
0284fd320f99f62aca800fb1251eff4c31ec4ed7

SHA256
6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

SHA512
b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

Download Submit
memory/3084-17-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3084-63-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3084-20-0x00000000193B0000-0x000000001960F000-memory.dmp

Filesize
2.4MB

Download
memory/3084-68-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3084-34-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3084-9-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3084-16-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3084-35-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3084-8-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3084-65-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3084-64-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3084-51-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3084-52-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3084-4-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4028-0-0x0000000002450000-0x0000000002451000-memory.dmp

Filesize
4KB

Download
memory/4028-10-0x0000000000400000-0x00000000005EC000-memory.dmp

Filesize
1.9MB

Download
memory/4028-1-0x0000000004010000-0x0000000004159000-memory.dmp

Filesize
1.3MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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