stealc | f025d3580288f938e2fabb4ee186c4bd318aaace33cf54ff11e1aec088ecf24c

General

Target

f025d3580288f938e2fabb4ee186c4bd318aaace33cf54ff11e1aec088ecf24c.exe
Size

2.1MB
MD5

5869684dd1c4290217e92a9b05c522cd
SHA1

b0f0fe99956affc2b9f16191de0e02d4ec80c9b6
SHA256

f025d3580288f938e2fabb4ee186c4bd318aaace33cf54ff11e1aec088ecf24c
SHA512

87c93a261b3e5fc89189f3c98967efa2e66a1efd9391407874f1c6746f451143fc578c8d7cdc8ac28ba5737122a38f69af03720173d620f13a201df39ee75f14
SSDEEP

49152:N6uDuaS9refa4JtTF+TxMoxc1TU+j+dAzGwlrh:N6uKb9f4tIuoITsdZ

Score

10^/10

stealc vidar discovery spyware stealer

Malware Config

Extracted

Family

stealc

rc4.plain

Signatures

Detect Vidar Stealer 13 IoCs

stealer

resource	yara_rule
behavioral2/memory/1100-2-0x00000000040B0000-0x00000000041F9000-memory.dmp	family_vidar_v7
behavioral2/memory/2068-8-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2068-10-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2068-4-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2068-19-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2068-20-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2068-37-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2068-38-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2068-54-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2068-55-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2068-66-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2068-67-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2068-70-0x0000000000400000-0x0000000000646000-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

pid	Process
2068	kat36EE.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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1100 set thread context of 2068	1100	f025d3580288f938e2fabb4ee186c4bd318aaace33cf54ff11e1aec088ecf24c.exe	77

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

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	kat36EE.tmp

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3088	timeout.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2068	kat36EE.tmp
2068	kat36EE.tmp
2068	kat36EE.tmp
2068	kat36EE.tmp

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 1100 wrote to memory of 2068	1100	f025d3580288f938e2fabb4ee186c4bd318aaace33cf54ff11e1aec088ecf24c.exe	77
PID 1100 wrote to memory of 2068	1100	f025d3580288f938e2fabb4ee186c4bd318aaace33cf54ff11e1aec088ecf24c.exe	77
PID 1100 wrote to memory of 2068	1100	f025d3580288f938e2fabb4ee186c4bd318aaace33cf54ff11e1aec088ecf24c.exe	77
PID 1100 wrote to memory of 2068	1100	f025d3580288f938e2fabb4ee186c4bd318aaace33cf54ff11e1aec088ecf24c.exe	77
PID 1100 wrote to memory of 2068	1100	f025d3580288f938e2fabb4ee186c4bd318aaace33cf54ff11e1aec088ecf24c.exe	77
PID 1100 wrote to memory of 2068	1100	f025d3580288f938e2fabb4ee186c4bd318aaace33cf54ff11e1aec088ecf24c.exe	77
PID 1100 wrote to memory of 2068	1100	f025d3580288f938e2fabb4ee186c4bd318aaace33cf54ff11e1aec088ecf24c.exe	77
PID 1100 wrote to memory of 2068	1100	f025d3580288f938e2fabb4ee186c4bd318aaace33cf54ff11e1aec088ecf24c.exe	77
PID 2068 wrote to memory of 656	2068	kat36EE.tmp	79
PID 2068 wrote to memory of 656	2068	kat36EE.tmp	79
PID 2068 wrote to memory of 656	2068	kat36EE.tmp	79
PID 656 wrote to memory of 3088	656	cmd.exe	81
PID 656 wrote to memory of 3088	656	cmd.exe	81
PID 656 wrote to memory of 3088	656	cmd.exe	81

C:\Users\Admin\AppData\Local\Temp\f025d3580288f938e2fabb4ee186c4bd318aaace33cf54ff11e1aec088ecf24c.exe
"C:\Users\Admin\AppData\Local\Temp\f025d3580288f938e2fabb4ee186c4bd318aaace33cf54ff11e1aec088ecf24c.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1100
- C:\Users\Admin\AppData\Local\Temp\kat36EE.tmp
  C:\Users\Admin\AppData\Local\Temp\kat36EE.tmp
  2⤵
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2068
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Users\Admin\AppData\Local\Temp\kat36EE.tmp" & rd /s /q "C:\ProgramData\FIEGCBKEGCFC" & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:656
  - - C:\Windows\SysWOW64\timeout.exe
      timeout /t 10
      4⤵
      Delays execution with timeout.exe
      PID:3088

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\kat36EE.tmp

Filesize
861KB

MD5
66064dbdb70a5eb15ebf3bf65aba254b

SHA1
0284fd320f99f62aca800fb1251eff4c31ec4ed7

SHA256
6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

SHA512
b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

Download Submit
memory/1100-2-0x00000000040B0000-0x00000000041F9000-memory.dmp

Filesize
1.3MB

Download
memory/1100-0-0x0000000002480000-0x0000000002481000-memory.dmp

Filesize
4KB

Download
memory/1100-9-0x0000000000400000-0x000000000061C000-memory.dmp

Filesize
2.1MB

Download
memory/2068-20-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2068-10-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2068-4-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2068-19-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2068-8-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2068-22-0x0000000026030000-0x000000002628F000-memory.dmp

Filesize
2.4MB

Download
memory/2068-37-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2068-38-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2068-54-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2068-55-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2068-66-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2068-67-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2068-70-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download

Analysis

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