stealc | e19e97a334ecb39058fd976080222a46cc2159e34c85df371a9eaf0088ee80eb

Analysis

max time kernel
133s
max time network
130s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
23-05-2024 10:44

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General

Target

1c09c6faad1ede18216df88b9d359543df5caacf810175b5e245e3e775b6b9a0.exe
Size

355KB
MD5

cdfa7c2a908819279534467811670643
SHA1

11ff7ed5218c9eeec2f073aeabd553b193fda606
SHA256

1c09c6faad1ede18216df88b9d359543df5caacf810175b5e245e3e775b6b9a0
SHA512

3a9c72ee86ba39c90dba7309b11b1ac600eb48ef500373e5ac4251f1d662db68d87a02283f916a5f3598c4d1e73a8cfa49b52b3dbbe1219dc51f9a127f437ea0
SSDEEP

6144:ZSuze0A9T1ApHSIZplkkWvWUfKQCqD2I2vrkIA0EPka6IjYbPD6up:ZTze0A95kkfxfR1DID+Iliup

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
behavioral4/memory/3124-2-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral4/memory/3124-5-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral4/memory/3124-7-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral4/memory/3124-11-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral4/memory/3124-12-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral4/memory/3124-29-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral4/memory/3124-30-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral4/memory/3124-46-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral4/memory/3124-47-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral4/memory/3124-61-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral4/memory/3124-62-0x0000000000400000-0x0000000000646000-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-1-5-21-4124900551-4068476067-3491212533-1000\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-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation	RegAsm.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

1c09c6faad1ede18216df88b9d359543df5caacf810175b5e245e3e775b6b9a0.exe

description	pid	process	target process
PID 876 set thread context of 3124	876	1c09c6faad1ede18216df88b9d359543df5caacf810175b5e245e3e775b6b9a0.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

784 timeout.exe
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

RegAsm.exe

pid process

3124 RegAsm.exe
3124 RegAsm.exe
3124 RegAsm.exe
3124 RegAsm.exe

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

pid	process
784	timeout.exe

pid	process
3124	RegAsm.exe
3124	RegAsm.exe
3124	RegAsm.exe
3124	RegAsm.exe

Suspicious use of WriteProcessMemory 18 IoCs

Processes:

1c09c6faad1ede18216df88b9d359543df5caacf810175b5e245e3e775b6b9a0.exeRegAsm.execmd.exe

description	pid	process	target process
PID 876 wrote to memory of 4260	876	1c09c6faad1ede18216df88b9d359543df5caacf810175b5e245e3e775b6b9a0.exe	RegAsm.exe
PID 876 wrote to memory of 4260	876	1c09c6faad1ede18216df88b9d359543df5caacf810175b5e245e3e775b6b9a0.exe	RegAsm.exe
PID 876 wrote to memory of 4260	876	1c09c6faad1ede18216df88b9d359543df5caacf810175b5e245e3e775b6b9a0.exe	RegAsm.exe
PID 876 wrote to memory of 3124	876	1c09c6faad1ede18216df88b9d359543df5caacf810175b5e245e3e775b6b9a0.exe	RegAsm.exe
PID 876 wrote to memory of 3124	876	1c09c6faad1ede18216df88b9d359543df5caacf810175b5e245e3e775b6b9a0.exe	RegAsm.exe
PID 876 wrote to memory of 3124	876	1c09c6faad1ede18216df88b9d359543df5caacf810175b5e245e3e775b6b9a0.exe	RegAsm.exe
PID 876 wrote to memory of 3124	876	1c09c6faad1ede18216df88b9d359543df5caacf810175b5e245e3e775b6b9a0.exe	RegAsm.exe
PID 876 wrote to memory of 3124	876	1c09c6faad1ede18216df88b9d359543df5caacf810175b5e245e3e775b6b9a0.exe	RegAsm.exe
PID 876 wrote to memory of 3124	876	1c09c6faad1ede18216df88b9d359543df5caacf810175b5e245e3e775b6b9a0.exe	RegAsm.exe
PID 876 wrote to memory of 3124	876	1c09c6faad1ede18216df88b9d359543df5caacf810175b5e245e3e775b6b9a0.exe	RegAsm.exe
PID 876 wrote to memory of 3124	876	1c09c6faad1ede18216df88b9d359543df5caacf810175b5e245e3e775b6b9a0.exe	RegAsm.exe
PID 876 wrote to memory of 3124	876	1c09c6faad1ede18216df88b9d359543df5caacf810175b5e245e3e775b6b9a0.exe	RegAsm.exe
PID 3124 wrote to memory of 1776	3124	RegAsm.exe	cmd.exe
PID 3124 wrote to memory of 1776	3124	RegAsm.exe	cmd.exe
PID 3124 wrote to memory of 1776	3124	RegAsm.exe	cmd.exe
PID 1776 wrote to memory of 784	1776	cmd.exe	timeout.exe
PID 1776 wrote to memory of 784	1776	cmd.exe	timeout.exe
PID 1776 wrote to memory of 784	1776	cmd.exe	timeout.exe

C:\Users\Admin\AppData\Local\Temp\1c09c6faad1ede18216df88b9d359543df5caacf810175b5e245e3e775b6b9a0.exe
"C:\Users\Admin\AppData\Local\Temp\1c09c6faad1ede18216df88b9d359543df5caacf810175b5e245e3e775b6b9a0.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:876

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
2⤵
PID:4260

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:3124

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c timeout /t 10 & rd /s /q "C:\ProgramData\EHDAAECAEBKJ" & exit
3⤵
- Suspicious use of WriteProcessMemory
PID:1776

C:\Windows\SysWOW64\timeout.exe
timeout /t 10
4⤵
- Delays execution with timeout.exe
PID:784

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

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Downloads

memory/876-0-0x0000000000810000-0x0000000000811000-memory.dmp

Filesize
4KB

Download
memory/876-1-0x0000000000810000-0x0000000000811000-memory.dmp

Filesize
4KB

Download
memory/876-3-0x0000000000810000-0x0000000000811000-memory.dmp

Filesize
4KB

Download
memory/3124-2-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3124-5-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3124-7-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3124-11-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3124-12-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3124-14-0x000000001B760000-0x000000001B9BF000-memory.dmp

Filesize
2.4MB

Download
memory/3124-29-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3124-30-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3124-46-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3124-47-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3124-61-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3124-62-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download