stealc | a5ab3633d41509db0d29ff1236e81a6cbf3756f3a4ec3cced1e63b858232a76b

General

Target

a5ab3633d41509db0d29ff1236e81a6cbf3756f3a4ec3cced1e63b858232a76b.exe
Size

2.0MB
MD5

d57e7837d66f9b4cfeb2565b476a281e
SHA1

503dac4727eb8b6242f3ab89a6fdf607271843a5
SHA256

a5ab3633d41509db0d29ff1236e81a6cbf3756f3a4ec3cced1e63b858232a76b
SHA512

13fd27797feaa40a75ebcb4c81fc08dfd933a280f03ccaea893cdf24642589144e5dc2d4a2e9b11131ee71e935e49b9d306ec6ce7d265014ef7ad00c6a516c28
SSDEEP

49152:IFno/jfwJtTF+TxMoxc1TU+j+dAzGkiT:IFno/jotIuoITsdZT

Score

10^/10

stealc vidar discovery spyware stealer

Malware Config

Extracted

Family

stealc

rc4.plain

Signatures

Detect Vidar Stealer 13 IoCs

stealer

Processes:

resource	yara_rule
behavioral2/memory/3520-1-0x0000000004040000-0x0000000004189000-memory.dmp	family_vidar_v7
behavioral2/memory/948-4-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/948-9-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/948-10-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/948-16-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/948-17-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/948-34-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/948-35-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/948-51-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/948-52-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/948-63-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/948-64-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/948-67-0x0000000000400000-0x0000000000646000-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:

kat780E.tmp

pid process

948 kat780E.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
948	kat780E.tmp

Suspicious use of SetThreadContext 1 IoCs

Processes:

a5ab3633d41509db0d29ff1236e81a6cbf3756f3a4ec3cced1e63b858232a76b.exe

description	pid	process	target process
PID 3520 set thread context of 948	3520	a5ab3633d41509db0d29ff1236e81a6cbf3756f3a4ec3cced1e63b858232a76b.exe	kat780E.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:

kat780E.tmp

description ioc process

Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString kat780E.tmp
Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

4232 timeout.exe
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

kat780E.tmp

pid process

948 kat780E.tmp
948 kat780E.tmp
948 kat780E.tmp
948 kat780E.tmp

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	kat780E.tmp

pid	process
4232	timeout.exe

pid	process
948	kat780E.tmp
948	kat780E.tmp
948	kat780E.tmp
948	kat780E.tmp

Suspicious use of WriteProcessMemory 14 IoCs

Processes:

a5ab3633d41509db0d29ff1236e81a6cbf3756f3a4ec3cced1e63b858232a76b.exekat780E.tmpcmd.exe

description	pid	process	target process
PID 3520 wrote to memory of 948	3520	a5ab3633d41509db0d29ff1236e81a6cbf3756f3a4ec3cced1e63b858232a76b.exe	kat780E.tmp
PID 3520 wrote to memory of 948	3520	a5ab3633d41509db0d29ff1236e81a6cbf3756f3a4ec3cced1e63b858232a76b.exe	kat780E.tmp
PID 3520 wrote to memory of 948	3520	a5ab3633d41509db0d29ff1236e81a6cbf3756f3a4ec3cced1e63b858232a76b.exe	kat780E.tmp
PID 3520 wrote to memory of 948	3520	a5ab3633d41509db0d29ff1236e81a6cbf3756f3a4ec3cced1e63b858232a76b.exe	kat780E.tmp
PID 3520 wrote to memory of 948	3520	a5ab3633d41509db0d29ff1236e81a6cbf3756f3a4ec3cced1e63b858232a76b.exe	kat780E.tmp
PID 3520 wrote to memory of 948	3520	a5ab3633d41509db0d29ff1236e81a6cbf3756f3a4ec3cced1e63b858232a76b.exe	kat780E.tmp
PID 3520 wrote to memory of 948	3520	a5ab3633d41509db0d29ff1236e81a6cbf3756f3a4ec3cced1e63b858232a76b.exe	kat780E.tmp
PID 3520 wrote to memory of 948	3520	a5ab3633d41509db0d29ff1236e81a6cbf3756f3a4ec3cced1e63b858232a76b.exe	kat780E.tmp
PID 948 wrote to memory of 4184	948	kat780E.tmp	cmd.exe
PID 948 wrote to memory of 4184	948	kat780E.tmp	cmd.exe
PID 948 wrote to memory of 4184	948	kat780E.tmp	cmd.exe
PID 4184 wrote to memory of 4232	4184	cmd.exe	timeout.exe
PID 4184 wrote to memory of 4232	4184	cmd.exe	timeout.exe
PID 4184 wrote to memory of 4232	4184	cmd.exe	timeout.exe

C:\Users\Admin\AppData\Local\Temp\a5ab3633d41509db0d29ff1236e81a6cbf3756f3a4ec3cced1e63b858232a76b.exe
"C:\Users\Admin\AppData\Local\Temp\a5ab3633d41509db0d29ff1236e81a6cbf3756f3a4ec3cced1e63b858232a76b.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3520

C:\Users\Admin\AppData\Local\Temp\kat780E.tmp
C:\Users\Admin\AppData\Local\Temp\kat780E.tmp
2⤵
- Executes dropped EXE
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:948

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Users\Admin\AppData\Local\Temp\kat780E.tmp" & rd /s /q "C:\ProgramData\AFIEGCAECGCA" & exit
3⤵
- Suspicious use of WriteProcessMemory
PID:4184

C:\Windows\SysWOW64\timeout.exe
timeout /t 10
4⤵
- Delays execution with timeout.exe
PID:4232

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\kat780E.tmp

Filesize
861KB

MD5
66064dbdb70a5eb15ebf3bf65aba254b

SHA1
0284fd320f99f62aca800fb1251eff4c31ec4ed7

SHA256
6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

SHA512
b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

Download Submit
memory/948-17-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/948-16-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/948-4-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/948-9-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/948-20-0x0000000019450000-0x00000000196AF000-memory.dmp

Filesize
2.4MB

Download
memory/948-67-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/948-64-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/948-63-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/948-10-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/948-34-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/948-35-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/948-51-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/948-52-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3520-0-0x0000000002570000-0x0000000002571000-memory.dmp

Filesize
4KB

Download
memory/3520-1-0x0000000004040000-0x0000000004189000-memory.dmp

Filesize
1.3MB

Download
memory/3520-7-0x0000000000400000-0x0000000000602000-memory.dmp

Filesize
2.0MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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