stealc | 4a4bb1f58d36dfc348999f8b6b6eea6fc8086bc27816600ab2fc0615293adad5

General

Target

4a4bb1f58d36dfc348999f8b6b6eea6fc8086bc27816600ab2fc0615293adad5.exe
Size

1.6MB
MD5

3892653352cff70ec13da5c1f91ba171
SHA1

1da97b04ee6596f2e795f9c5ddb28939de96d192
SHA256

4a4bb1f58d36dfc348999f8b6b6eea6fc8086bc27816600ab2fc0615293adad5
SHA512

c46cea399bfa6eb0288ac78e9fa8d721a1edcf2850c856b7e0515b3240c660b920b31f931638eca19373088eee6825dd55ca8c18c7786382733f9adefd5cf17d
SSDEEP

24576:spM5863IGfTAVpalB+UfMxVVtes12FxwojKr98YGeGG9i:spQLYkTYp6B+UkxVVChjHZQs

Score

10^/10

stealc vidar discovery spyware stealer

Malware Config

Extracted

Family

stealc

rc4.plain

Extracted

Family

vidar

C2

https://t.me/r8z0l

https://steamcommunity.com/profiles/76561199698764354

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/4156-2-0x0000000004030000-0x0000000004140000-memory.dmp	family_vidar_v7
behavioral2/memory/2756-4-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2756-8-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2756-9-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2756-15-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2756-16-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2756-33-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2756-34-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2756-50-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2756-51-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2756-62-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2756-63-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2756-64-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2756-67-0x0000000000400000-0x0000000000648000-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
Executes dropped EXE 1 IoCs

Processes:

kat5331.tmp

pid process

2756 kat5331.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 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
2756	kat5331.tmp

Suspicious use of SetThreadContext 1 IoCs

Processes:

4a4bb1f58d36dfc348999f8b6b6eea6fc8086bc27816600ab2fc0615293adad5.exe

description	pid	process	target process
PID 4156 set thread context of 2756	4156	4a4bb1f58d36dfc348999f8b6b6eea6fc8086bc27816600ab2fc0615293adad5.exe	kat5331.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:

kat5331.tmp

description ioc process

Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString kat5331.tmp
Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

2828 timeout.exe
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

kat5331.tmp

pid process

2756 kat5331.tmp
2756 kat5331.tmp
2756 kat5331.tmp
2756 kat5331.tmp

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	kat5331.tmp

pid	process
2828	timeout.exe

pid	process
2756	kat5331.tmp
2756	kat5331.tmp
2756	kat5331.tmp
2756	kat5331.tmp

Suspicious use of WriteProcessMemory 14 IoCs

Processes:

4a4bb1f58d36dfc348999f8b6b6eea6fc8086bc27816600ab2fc0615293adad5.exekat5331.tmpcmd.exe

description	pid	process	target process
PID 4156 wrote to memory of 2756	4156	4a4bb1f58d36dfc348999f8b6b6eea6fc8086bc27816600ab2fc0615293adad5.exe	kat5331.tmp
PID 4156 wrote to memory of 2756	4156	4a4bb1f58d36dfc348999f8b6b6eea6fc8086bc27816600ab2fc0615293adad5.exe	kat5331.tmp
PID 4156 wrote to memory of 2756	4156	4a4bb1f58d36dfc348999f8b6b6eea6fc8086bc27816600ab2fc0615293adad5.exe	kat5331.tmp
PID 4156 wrote to memory of 2756	4156	4a4bb1f58d36dfc348999f8b6b6eea6fc8086bc27816600ab2fc0615293adad5.exe	kat5331.tmp
PID 4156 wrote to memory of 2756	4156	4a4bb1f58d36dfc348999f8b6b6eea6fc8086bc27816600ab2fc0615293adad5.exe	kat5331.tmp
PID 4156 wrote to memory of 2756	4156	4a4bb1f58d36dfc348999f8b6b6eea6fc8086bc27816600ab2fc0615293adad5.exe	kat5331.tmp
PID 4156 wrote to memory of 2756	4156	4a4bb1f58d36dfc348999f8b6b6eea6fc8086bc27816600ab2fc0615293adad5.exe	kat5331.tmp
PID 4156 wrote to memory of 2756	4156	4a4bb1f58d36dfc348999f8b6b6eea6fc8086bc27816600ab2fc0615293adad5.exe	kat5331.tmp
PID 2756 wrote to memory of 2320	2756	kat5331.tmp	cmd.exe
PID 2756 wrote to memory of 2320	2756	kat5331.tmp	cmd.exe
PID 2756 wrote to memory of 2320	2756	kat5331.tmp	cmd.exe
PID 2320 wrote to memory of 2828	2320	cmd.exe	timeout.exe
PID 2320 wrote to memory of 2828	2320	cmd.exe	timeout.exe
PID 2320 wrote to memory of 2828	2320	cmd.exe	timeout.exe

C:\Users\Admin\AppData\Local\Temp\4a4bb1f58d36dfc348999f8b6b6eea6fc8086bc27816600ab2fc0615293adad5.exe
"C:\Users\Admin\AppData\Local\Temp\4a4bb1f58d36dfc348999f8b6b6eea6fc8086bc27816600ab2fc0615293adad5.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4156

C:\Users\Admin\AppData\Local\Temp\kat5331.tmp
C:\Users\Admin\AppData\Local\Temp\kat5331.tmp
2⤵
- Executes dropped EXE
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2756

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Users\Admin\AppData\Local\Temp\kat5331.tmp" & rd /s /q "C:\ProgramData\AKFCFBAAEHCF" & exit
3⤵
- Suspicious use of WriteProcessMemory
PID:2320

C:\Windows\SysWOW64\timeout.exe
timeout /t 10
4⤵
- Delays execution with timeout.exe
PID:2828

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

3

T1552

Credentials In Files

3

T1552.001

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

3

T1005

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

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Downloads

C:\Users\Admin\AppData\Local\Temp\kat5331.tmp
Filesize
861KB

MD5
66064dbdb70a5eb15ebf3bf65aba254b

SHA1
0284fd320f99f62aca800fb1251eff4c31ec4ed7

SHA256
6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

SHA512
b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

Download Submit
memory/2756-16-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2756-62-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2756-19-0x00000000193D0000-0x000000001962F000-memory.dmp

Filesize
2.4MB

Download
memory/2756-8-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2756-33-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2756-9-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2756-15-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2756-34-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2756-67-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2756-64-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2756-63-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2756-50-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2756-51-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/2756-4-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/4156-0-0x00000000022F0000-0x00000000022F1000-memory.dmp

Filesize
4KB

Download
memory/4156-10-0x0000000000400000-0x0000000000594000-memory.dmp

Filesize
1.6MB

Download
memory/4156-2-0x0000000004030000-0x0000000004140000-memory.dmp

Filesize
1.1MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads