stealc | a42b02b5982a9377fda991f5da92e16a8cc3330104e257b80f36da6b85eeb0c5

General

Target

a42b02b5982a9377fda991f5da92e16a8cc3330104e257b80f36da6b85eeb0c5.exe
Size

1.9MB
MD5

4eba330661f361a3ac57e84eaf8af125
SHA1

06828942abc7cde3ca374aca1608562d7eefab1a
SHA256

a42b02b5982a9377fda991f5da92e16a8cc3330104e257b80f36da6b85eeb0c5
SHA512

81781cc58cce0119eb6eed4d97777d28c58fb7da4a3785c6334934c61fd586e86a5b6aea6d15e696aff79109bf195154a54148cc11e205b9d9624011681b0b7d
SSDEEP

49152:CdKfTn6veJtTF+TxMoxc1TU+j+dAzGwlrh:CdKfTn9tIuoITsdZ

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 8 IoCs

stealer

Processes:

resource	yara_rule
behavioral1/memory/232-2-0x0000000003FF0000-0x0000000004139000-memory.dmp	family_vidar_v7
behavioral1/memory/1492-4-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/1492-9-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/1492-10-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/1492-14-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/1492-15-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/1492-32-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/1492-33-0x0000000000400000-0x0000000000646000-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:

kat50CF.tmp

pid process

1492 kat50CF.tmp
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
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
1492	kat50CF.tmp

Suspicious use of SetThreadContext 1 IoCs

Processes:

a42b02b5982a9377fda991f5da92e16a8cc3330104e257b80f36da6b85eeb0c5.exe

description	pid	process	target process
PID 232 set thread context of 1492	232	a42b02b5982a9377fda991f5da92e16a8cc3330104e257b80f36da6b85eeb0c5.exe	kat50CF.tmp

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:

kat50CF.tmp

description ioc process

Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString kat50CF.tmp
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

kat50CF.tmp

pid process

1492 kat50CF.tmp
1492 kat50CF.tmp

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	kat50CF.tmp

pid	process
1492	kat50CF.tmp
1492	kat50CF.tmp

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

a42b02b5982a9377fda991f5da92e16a8cc3330104e257b80f36da6b85eeb0c5.exe

description	pid	process	target process
PID 232 wrote to memory of 1492	232	a42b02b5982a9377fda991f5da92e16a8cc3330104e257b80f36da6b85eeb0c5.exe	kat50CF.tmp
PID 232 wrote to memory of 1492	232	a42b02b5982a9377fda991f5da92e16a8cc3330104e257b80f36da6b85eeb0c5.exe	kat50CF.tmp
PID 232 wrote to memory of 1492	232	a42b02b5982a9377fda991f5da92e16a8cc3330104e257b80f36da6b85eeb0c5.exe	kat50CF.tmp
PID 232 wrote to memory of 1492	232	a42b02b5982a9377fda991f5da92e16a8cc3330104e257b80f36da6b85eeb0c5.exe	kat50CF.tmp
PID 232 wrote to memory of 1492	232	a42b02b5982a9377fda991f5da92e16a8cc3330104e257b80f36da6b85eeb0c5.exe	kat50CF.tmp
PID 232 wrote to memory of 1492	232	a42b02b5982a9377fda991f5da92e16a8cc3330104e257b80f36da6b85eeb0c5.exe	kat50CF.tmp
PID 232 wrote to memory of 1492	232	a42b02b5982a9377fda991f5da92e16a8cc3330104e257b80f36da6b85eeb0c5.exe	kat50CF.tmp
PID 232 wrote to memory of 1492	232	a42b02b5982a9377fda991f5da92e16a8cc3330104e257b80f36da6b85eeb0c5.exe	kat50CF.tmp

C:\Users\Admin\AppData\Local\Temp\a42b02b5982a9377fda991f5da92e16a8cc3330104e257b80f36da6b85eeb0c5.exe
"C:\Users\Admin\AppData\Local\Temp\a42b02b5982a9377fda991f5da92e16a8cc3330104e257b80f36da6b85eeb0c5.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:232

C:\Users\Admin\AppData\Local\Temp\kat50CF.tmp
C:\Users\Admin\AppData\Local\Temp\kat50CF.tmp
2⤵
- Executes dropped EXE
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
PID:1492

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Query Registry

2

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

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Downloads

C:\Users\Admin\AppData\Local\Temp\kat50CF.tmp
Filesize
861KB

MD5
66064dbdb70a5eb15ebf3bf65aba254b

SHA1
0284fd320f99f62aca800fb1251eff4c31ec4ed7

SHA256
6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

SHA512
b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

Download Submit
memory/232-0-0x0000000000790000-0x0000000000791000-memory.dmp

Filesize
4KB

Download
memory/232-2-0x0000000003FF0000-0x0000000004139000-memory.dmp

Filesize
1.3MB

Download
memory/232-8-0x0000000000400000-0x00000000005EC000-memory.dmp

Filesize
1.9MB

Download
memory/1492-4-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/1492-9-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/1492-10-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/1492-14-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/1492-15-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/1492-17-0x000000001B720000-0x000000001B97F000-memory.dmp

Filesize
2.4MB

Download
memory/1492-32-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/1492-33-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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