stealc | 81f031fef87877f5386e069506191a107450ea7d75a096e941829ef5c9f34d49

General

Target

81f031fef87877f5386e069506191a107450ea7d75a096e941829ef5c9f34d49.exe
Size

218KB
MD5

85848348748da43e5496feab5bc83174
SHA1

471141600238bf1517fdd83d790da03d553c41e1
SHA256

81f031fef87877f5386e069506191a107450ea7d75a096e941829ef5c9f34d49
SHA512

ee5a5a6414fb3f9ccd78cd80bbde07ed0d0c71a57ba2868162ac825ffdf42fc3637db800f1f58fb37fa9c00473b34ef60aedb5ee1aecce5e9232f978787985ba
SSDEEP

3072:1Qy8P9HS7oFU3yHEMASzt8vXOtVuplJmgoR2nJ9F4IJ96RcIw5s8et8i:mlg1uEM3k+tVYlJtv3yRc+8eSi

Score

10^/10

stealc discovery spyware stealer

Malware Config

Extracted

Family

stealc

C2

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

Signatures

Detects Stealc stealer 2 IoCs

stealer

Processes:

resource	yara_rule
behavioral1/memory/3004-201-0x0000000000400000-0x0000000000628000-memory.dmp	family_stealc
behavioral1/memory/3004-210-0x0000000000400000-0x0000000000628000-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

Processes:

81f031fef87877f5386e069506191a107450ea7d75a096e941829ef5c9f34d49.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1529757233-3489015626-3409890339-1000\Control Panel\International\Geo\Nation	81f031fef87877f5386e069506191a107450ea7d75a096e941829ef5c9f34d49.exe

Loads dropped DLL 2 IoCs

Processes:

81f031fef87877f5386e069506191a107450ea7d75a096e941829ef5c9f34d49.exe

pid	process
3004	81f031fef87877f5386e069506191a107450ea7d75a096e941829ef5c9f34d49.exe
3004	81f031fef87877f5386e069506191a107450ea7d75a096e941829ef5c9f34d49.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

Processes:

WerFault.exe

pid pid_target process target process

4880 3004 WerFault.exe 81f031fef87877f5386e069506191a107450ea7d75a096e941829ef5c9f34d49.exe

pid	pid_target	process	target process
4880	3004	WerFault.exe	81f031fef87877f5386e069506191a107450ea7d75a096e941829ef5c9f34d49.exe

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

Processes:

81f031fef87877f5386e069506191a107450ea7d75a096e941829ef5c9f34d49.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	81f031fef87877f5386e069506191a107450ea7d75a096e941829ef5c9f34d49.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	81f031fef87877f5386e069506191a107450ea7d75a096e941829ef5c9f34d49.exe

Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

2948 timeout.exe

pid	process
2948	timeout.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

81f031fef87877f5386e069506191a107450ea7d75a096e941829ef5c9f34d49.exe

pid	process
3004	81f031fef87877f5386e069506191a107450ea7d75a096e941829ef5c9f34d49.exe
3004	81f031fef87877f5386e069506191a107450ea7d75a096e941829ef5c9f34d49.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

81f031fef87877f5386e069506191a107450ea7d75a096e941829ef5c9f34d49.execmd.exe

description	pid	process	target process
PID 3004 wrote to memory of 2004	3004	81f031fef87877f5386e069506191a107450ea7d75a096e941829ef5c9f34d49.exe	cmd.exe
PID 3004 wrote to memory of 2004	3004	81f031fef87877f5386e069506191a107450ea7d75a096e941829ef5c9f34d49.exe	cmd.exe
PID 3004 wrote to memory of 2004	3004	81f031fef87877f5386e069506191a107450ea7d75a096e941829ef5c9f34d49.exe	cmd.exe
PID 2004 wrote to memory of 2948	2004	cmd.exe	timeout.exe
PID 2004 wrote to memory of 2948	2004	cmd.exe	timeout.exe
PID 2004 wrote to memory of 2948	2004	cmd.exe	timeout.exe

C:\Users\Admin\AppData\Local\Temp\81f031fef87877f5386e069506191a107450ea7d75a096e941829ef5c9f34d49.exe
"C:\Users\Admin\AppData\Local\Temp\81f031fef87877f5386e069506191a107450ea7d75a096e941829ef5c9f34d49.exe"
1⤵
- Checks computer location settings
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:3004

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\system32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\81f031fef87877f5386e069506191a107450ea7d75a096e941829ef5c9f34d49.exe" & del "C:\ProgramData\*.dll"" & exit
2⤵
- Suspicious use of WriteProcessMemory
PID:2004

C:\Windows\SysWOW64\timeout.exe
timeout /t 5
3⤵
- Delays execution with timeout.exe
PID:2948

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 3004 -s 2368
2⤵
- Program crash
PID:4880

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 3004 -ip 3004
1⤵
PID:3992

Network

MITRE ATT&CK Matrix ATT&CK 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

Exfiltration

Command and Control

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/3004-134-0x0000000002360000-0x0000000002375000-memory.dmp

Filesize
84KB

Download
memory/3004-135-0x0000000000400000-0x0000000000628000-memory.dmp

Filesize
2.2MB

Download
memory/3004-137-0x0000000061E00000-0x0000000061EF3000-memory.dmp

Filesize
972KB

Download
memory/3004-201-0x0000000000400000-0x0000000000628000-memory.dmp

Filesize
2.2MB

Download
memory/3004-210-0x0000000000400000-0x0000000000628000-memory.dmp

Filesize
2.2MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads