stealc | f639530345c52597fc8d4f6ccc98b71f03088a0c330a7df97cf4e3099da918b1

General

Target

f639530345c52597fc8d4f6ccc98b71f03088a0c330a7df97cf4e3099da918b1.exe
Size

259KB
MD5

8af3ec4b29900ba45e8396e75723910d
SHA1

b9e2b80ceac51ac75121605deaa43777dad688f8
SHA256

f639530345c52597fc8d4f6ccc98b71f03088a0c330a7df97cf4e3099da918b1
SHA512

f806ef0f9b29f67bf3275161199ce5408c8e83fe7f73367ecf6bf8a7439ac62ae9cc9c82eb3499aae72db2aae2f9318601b740f53b25e46b3c1fc392bf80446f
SSDEEP

3072:yT5/jenm+QDALP5ayFeBbBGpeWIQIkAB9quZcedzIQw94wf2cuQs5xbBFzwRn:yF1DALAyWbEIlki9quZc0zIQO9urNd

Score

10^/10

stealc discovery spyware stealer

Malware Config

Extracted

Family

stealc

C2

http://joscramp.top/410b5129171f10ea.php

Signatures

Detects Stealc stealer 2 IoCs

stealer

resource	yara_rule
behavioral1/memory/4472-211-0x0000000000400000-0x0000000000704000-memory.dmp	family_stealc
behavioral1/memory/4472-212-0x0000000000400000-0x0000000000704000-memory.dmp	family_stealc

Stealc
Stealc is an infostealer written in C++.
stealer stealc
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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2805025096-2326403612-4231045514-1000\Control Panel\International\Geo\Nation	f639530345c52597fc8d4f6ccc98b71f03088a0c330a7df97cf4e3099da918b1.exe

Loads dropped DLL 2 IoCs

pid	Process
4472	f639530345c52597fc8d4f6ccc98b71f03088a0c330a7df97cf4e3099da918b1.exe
4472	f639530345c52597fc8d4f6ccc98b71f03088a0c330a7df97cf4e3099da918b1.exe

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
T1081
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials in Files
T1081
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
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
964	4472	WerFault.exe	86

Checks processor information in registry 2 TTPs 2 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	f639530345c52597fc8d4f6ccc98b71f03088a0c330a7df97cf4e3099da918b1.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	f639530345c52597fc8d4f6ccc98b71f03088a0c330a7df97cf4e3099da918b1.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2080	timeout.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4472	f639530345c52597fc8d4f6ccc98b71f03088a0c330a7df97cf4e3099da918b1.exe
4472	f639530345c52597fc8d4f6ccc98b71f03088a0c330a7df97cf4e3099da918b1.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4472 wrote to memory of 2620	4472	f639530345c52597fc8d4f6ccc98b71f03088a0c330a7df97cf4e3099da918b1.exe	91
PID 4472 wrote to memory of 2620	4472	f639530345c52597fc8d4f6ccc98b71f03088a0c330a7df97cf4e3099da918b1.exe	91
PID 4472 wrote to memory of 2620	4472	f639530345c52597fc8d4f6ccc98b71f03088a0c330a7df97cf4e3099da918b1.exe	91
PID 2620 wrote to memory of 2080	2620	cmd.exe	94
PID 2620 wrote to memory of 2080	2620	cmd.exe	94
PID 2620 wrote to memory of 2080	2620	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\f639530345c52597fc8d4f6ccc98b71f03088a0c330a7df97cf4e3099da918b1.exe
"C:\Users\Admin\AppData\Local\Temp\f639530345c52597fc8d4f6ccc98b71f03088a0c330a7df97cf4e3099da918b1.exe"
1⤵
- Checks computer location settings
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4472
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\system32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\f639530345c52597fc8d4f6ccc98b71f03088a0c330a7df97cf4e3099da918b1.exe" & del "C:\ProgramData\*.dll"" & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2620
- - C:\Windows\SysWOW64\timeout.exe
    timeout /t 5
    3⤵
    - Delays execution with timeout.exe
    PID:2080
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4472 -s 2404
  2⤵
  - Program crash
  PID:964

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 184 -p 4472 -ip 4472
1⤵
PID:4904

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

2

T1081

Discovery

Query Registry

3

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Data from Local System

2

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\mozglue.dll

Filesize
593KB

MD5
c8fd9be83bc728cc04beffafc2907fe9

SHA1
95ab9f701e0024cedfbd312bcfe4e726744c4f2e

SHA256
ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a

SHA512
fbb446f4a27ef510e616caad52945d6c9cc1fd063812c41947e579ec2b54df57c6dc46237ded80fca5847f38cbe1747a6c66a13e2c8c19c664a72be35eb8b040

Download Submit
C:\ProgramData\mozglue.dll

Filesize
593KB

MD5
c8fd9be83bc728cc04beffafc2907fe9

SHA1
95ab9f701e0024cedfbd312bcfe4e726744c4f2e

SHA256
ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a

SHA512
fbb446f4a27ef510e616caad52945d6c9cc1fd063812c41947e579ec2b54df57c6dc46237ded80fca5847f38cbe1747a6c66a13e2c8c19c664a72be35eb8b040

Download Submit
C:\ProgramData\nss3.dll

Filesize
2.0MB

MD5
1cc453cdf74f31e4d913ff9c10acdde2

SHA1
6e85eae544d6e965f15fa5c39700fa7202f3aafe

SHA256
ac5c92fe6c51cfa742e475215b83b3e11a4379820043263bf50d4068686c6fa5

SHA512
dd9ff4e06b00dc831439bab11c10e9b2ae864ea6e780d3835ea7468818f35439f352ef137da111efcdf2bb6465f6ca486719451bf6cf32c6a4420a56b1d64571

Download Submit
C:\Users\Admin\AppData\Local\Temp\Are.docx

Filesize
11KB

MD5
a33e5b189842c5867f46566bdbf7a095

SHA1
e1c06359f6a76da90d19e8fd95e79c832edb3196

SHA256
5abf8e3d1f78de7b09d7f6fb87f9e80e60caacf13ef3c1289665653dacd7c454

SHA512
f2ad3812ec9b915e9618539b0f103f2e9acaad25fbbacd84941c954ce070af231324e83a4621e951c1dbae8d40d50410954e40dd52bbd46e34c54b0d1957407b

Download Submit
memory/4472-134-0x0000000002300000-0x0000000002315000-memory.dmp

Filesize
84KB

Download
memory/4472-135-0x0000000061E00000-0x0000000061EF3000-memory.dmp

Filesize
972KB

Download
memory/4472-211-0x0000000000400000-0x0000000000704000-memory.dmp

Filesize
3.0MB

Download
memory/4472-212-0x0000000000400000-0x0000000000704000-memory.dmp

Filesize
3.0MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads