stealc | 0d51462bdc4ff0ef00c290aca555c13fc4d30ab74db79a043bbe75925407bbbd

Analysis

max time kernel
143s
max time network
154s
platform
windows10-2004_x64
resource
win10v2004-20231025-en
resource tags

arch:x64arch:x86image:win10v2004-20231025-enlocale:en-usos:windows10-2004-x64system
submitted
29/10/2023, 23:01

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General

Target
5c7e99e833e0c37ca9b4571923fd12e4.exe
Size 642KB
Sample231029-2zjc2abe98
SHA256 0d51462bdc4ff0ef00c290aca555c13fc4d30ab74db79a043bbe75925407bbbd
MD5 5c7e99e833e0c37ca9b4571923fd12e4
SHA1 a0ebd339bd527a1e83461c4dcab681b53a45f908
SHA512 e9c5b84592941fee05a1d63cb403f0a627b048395fe0761c899982ed8a1c29ad6c3be985c39fc945b48fc35ba61a8ea431307a3da5e25580eb5f079ac85ac06f
SSDEEP 12288:JHQ4R78rGcukgmWRjAeQSqtoCldl4Dol9:1HhZcw95jJCloDg9
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

stealc discovery spyware stealer

Malware Config

Extracted

Family

stealc

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-1-5-21-177160434-2093019976-369403398-1000\Control Panel\International\Geo\Nation	5c7e99e833e0c37ca9b4571923fd12e4.exe

Loads dropped DLL 2 IoCs

pid	Process
4988	5c7e99e833e0c37ca9b4571923fd12e4.exe
4988	5c7e99e833e0c37ca9b4571923fd12e4.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
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 4 IoCs

pid	pid_target	Process	procid_target
228	4988	WerFault.exe	84
4976	4988	WerFault.exe	84
2648	4988	WerFault.exe	84
2768	4988	WerFault.exe	84

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 opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	5c7e99e833e0c37ca9b4571923fd12e4.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	5c7e99e833e0c37ca9b4571923fd12e4.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2808	timeout.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4988	5c7e99e833e0c37ca9b4571923fd12e4.exe
4988	5c7e99e833e0c37ca9b4571923fd12e4.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4988 wrote to memory of 3808	4988	5c7e99e833e0c37ca9b4571923fd12e4.exe	96
PID 4988 wrote to memory of 3808	4988	5c7e99e833e0c37ca9b4571923fd12e4.exe	96
PID 4988 wrote to memory of 3808	4988	5c7e99e833e0c37ca9b4571923fd12e4.exe	96
PID 3808 wrote to memory of 2808	3808	cmd.exe	100
PID 3808 wrote to memory of 2808	3808	cmd.exe	100
PID 3808 wrote to memory of 2808	3808	cmd.exe	100

C:\Users\Admin\AppData\Local\Temp\5c7e99e833e0c37ca9b4571923fd12e4.exe
"C:\Users\Admin\AppData\Local\Temp\5c7e99e833e0c37ca9b4571923fd12e4.exe"
1⤵
- Checks computer location settings
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4988
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4988 -s 2124
  2⤵
  - Program crash
  PID:228
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4988 -s 2192
  2⤵
  - Program crash
  PID:4976
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\system32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\5c7e99e833e0c37ca9b4571923fd12e4.exe" & del "C:\ProgramData\*.dll"" & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3808
- - C:\Windows\SysWOW64\timeout.exe
    timeout /t 5
    3⤵
    - Delays execution with timeout.exe
    PID:2808
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4988 -s 140
  2⤵
  - Program crash
  PID:2648
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4988 -s 152
  2⤵
  - Program crash
  PID:2768

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 4988 -ip 4988
1⤵
PID:540

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 4988 -ip 4988
1⤵
PID:2920

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 520 -p 4988 -ip 4988
1⤵
PID:4432

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 4988 -ip 4988
1⤵
PID:4456

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

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/4988-3-0x00000000006F0000-0x00000000006F1000-memory.dmp

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memory/4988-4-0x0000000061E00000-0x0000000061EF3000-memory.dmp

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memory/4988-28-0x0000000010000000-0x00000000100A6000-memory.dmp

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memory/4988-43-0x0000000010000000-0x000000001022D000-memory.dmp

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memory/4988-53-0x0000000010000000-0x00000000100A6000-memory.dmp

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memory/4988-0-0x00000000006F0000-0x00000000006F1000-memory.dmp

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memory/4988-2-0x0000000010000000-0x000000001022D000-memory.dmp

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memory/4988-1-0x0000000002320000-0x000000000234B000-memory.dmp

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memory/4988-74-0x0000000010000000-0x00000000100A6000-memory.dmp

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memory/4988-75-0x0000000010000000-0x000000001022D000-memory.dmp

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