stealc | fe51a9deb7a5465e8bfd3aaa8352e036613f1c9f257c2dce810b5e01bab5bace

Analysis

max time kernel
144s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20231127-en
resource tags

arch:x64arch:x86image:win10v2004-20231127-enlocale:en-usos:windows10-2004-x64system
submitted
04/12/2023, 19:40

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General

Target
file.exe
Size 290KB
Sample231204-yd2qpsfb28
SHA256 fe51a9deb7a5465e8bfd3aaa8352e036613f1c9f257c2dce810b5e01bab5bace
MD5 f57035d13d2cc9777b2c8df6e2470fa2
SHA1 4e563e4957bfb8d1f2f504a640e14ed230463a78
SHA512 699178f8f2ab0494eddf35770bbea1797ddd75afa78dc701f672583325809a7e2dea4e6aba40031546dfae480a0ff3e80ec99f4c318c7903c6fd276ad1efa872
SSDEEP 3072:M/tOuYXdXa+844dvwNwvxk9ThdGYCMd60iAJt17K+5Up0cVZkTkS:gHB4kvwavxATh0YCjc7Qp06iT
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

stealc discovery spyware stealer

Malware Config

Extracted

Family

stealc

http://5.42.64.41

Attributes

url_path
/40d570f44e84a454.php

rc4.plain

Signatures

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-1-5-21-2037190880-819243489-950462038-1000\Control Panel\International\Geo\Nation	file.exe

Loads dropped DLL 2 IoCs

pid	Process
984	file.exe
984	file.exe

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 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
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3200	984	WerFault.exe	87

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	file.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	file.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2976	timeout.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
984	file.exe
984	file.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 984 wrote to memory of 4976	984	file.exe	95
PID 984 wrote to memory of 4976	984	file.exe	95
PID 984 wrote to memory of 4976	984	file.exe	95
PID 4976 wrote to memory of 2976	4976	cmd.exe	98
PID 4976 wrote to memory of 2976	4976	cmd.exe	98
PID 4976 wrote to memory of 2976	4976	cmd.exe	98

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Checks computer location settings
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:984
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\system32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\file.exe" & del "C:\ProgramData\*.dll"" & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4976
- - C:\Windows\SysWOW64\timeout.exe
    timeout /t 5
    3⤵
    - Delays execution with timeout.exe
    PID:2976
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 984 -s 2472
  2⤵
  - Program crash
  PID:3200

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 984 -ip 984
1⤵
PID:3660

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

Are.docx

Path C:\ProgramData\Are.docx
Size 11KB
SHA256 5abf8e3d1f78de7b09d7f6fb87f9e80e60caacf13ef3c1289665653dacd7c454
MD5 a33e5b189842c5867f46566bdbf7a095
SHA1 e1c06359f6a76da90d19e8fd95e79c832edb3196
SHA512 f2ad3812ec9b915e9618539b0f103f2e9acaad25fbbacd84941c954ce070af231324e83a4621e951c1dbae8d40d50410954e40dd52bbd46e34c54b0d1957407b
SSDEEP 192:CtNCEE33S7Ok0CMSYbcBVk6tqM16iPBkeawLWdxd7o3Lp:aNwC78uYbcBv6akwLWdxdE3Lp
MD5 SHA1 SHA512 SSDEEP

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mozglue.dll

Path C:\ProgramData\mozglue.dll
Size 593KB
SHA256 ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a
MD5 c8fd9be83bc728cc04beffafc2907fe9
SHA1 95ab9f701e0024cedfbd312bcfe4e726744c4f2e
SHA512 fbb446f4a27ef510e616caad52945d6c9cc1fd063812c41947e579ec2b54df57c6dc46237ded80fca5847f38cbe1747a6c66a13e2c8c19c664a72be35eb8b040
SSDEEP 12288:BlSyAom/gcRKMdRm4wFkRHuyG4RRGJVDjMk/x21R8gY/r:BKgcRKMdRm4wFkVVDGJVv//x21R8br
MD5 SHA1 SHA512 SSDEEP

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mozglue.dll

Path C:\ProgramData\mozglue.dll
Size 593KB
SHA256 ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a
MD5 c8fd9be83bc728cc04beffafc2907fe9
SHA1 95ab9f701e0024cedfbd312bcfe4e726744c4f2e
SHA512 fbb446f4a27ef510e616caad52945d6c9cc1fd063812c41947e579ec2b54df57c6dc46237ded80fca5847f38cbe1747a6c66a13e2c8c19c664a72be35eb8b040
SSDEEP 12288:BlSyAom/gcRKMdRm4wFkRHuyG4RRGJVDjMk/x21R8gY/r:BKgcRKMdRm4wFkVVDGJVv//x21R8br
MD5 SHA1 SHA512 SSDEEP

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nss3.dll

Path C:\ProgramData\nss3.dll
Size 2.0MB
SHA256 ac5c92fe6c51cfa742e475215b83b3e11a4379820043263bf50d4068686c6fa5
MD5 1cc453cdf74f31e4d913ff9c10acdde2
SHA1 6e85eae544d6e965f15fa5c39700fa7202f3aafe
SHA512 dd9ff4e06b00dc831439bab11c10e9b2ae864ea6e780d3835ea7468818f35439f352ef137da111efcdf2bb6465f6ca486719451bf6cf32c6a4420a56b1d64571
SSDEEP 49152:fECf12gikHlnKGxJRIB+y5nvxnaOSJ3HFNWYrVvE4CQsgzMmQfTU1NrWmy4KoAzh:J7Tf8J1Q+SS5/nr
MD5 SHA1 SHA512 SSDEEP

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memory/984-3-0x0000000000400000-0x0000000002ABF000-memory.dmp

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memory/984-4-0x0000000061E00000-0x0000000061EF3000-memory.dmp

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memory/984-52-0x0000000000400000-0x0000000002ABF000-memory.dmp

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memory/984-1-0x0000000002C10000-0x0000000002D10000-memory.dmp

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memory/984-84-0x0000000002C10000-0x0000000002D10000-memory.dmp

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memory/984-2-0x0000000004800000-0x000000000481C000-memory.dmp

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memory/984-90-0x0000000000400000-0x0000000002ABF000-memory.dmp

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memory/984-91-0x0000000004800000-0x000000000481C000-memory.dmp

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memory/984-92-0x0000000000400000-0x0000000002ABF000-memory.dmp

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