stealc | 1b98ff3d14eb43fe194e8125eb8697285b73e85fb9464fbb738f704f3210b763

Analysis

max time kernel
142s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
01/02/2024, 15:03

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General

Target
file.exe
Size 172KB
Sample240201-se1xxaabbq
SHA256 1b98ff3d14eb43fe194e8125eb8697285b73e85fb9464fbb738f704f3210b763
MD5 bf9b313b433b4360e6be1180f9ac03b7
SHA1 78bd67daf23d2798481f0c357a5b80f324a18ca5
SHA512 43b113e21aa1802b56e57966860d5ac678ebd8ebd7be78b9def48de4a8f606df908cdf83f3acd307d159e491f12003254ee9d28813a8d016bbb8425a055a01ca
SSDEEP 3072:ImYLbnFUgErUUUSPxRfLAtXVXaFf8yXU4YZWkkSSa582x6TNm5:IxLDy7UUU+xUoc4WW2l
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

stealc discovery spyware stealer

Malware Config

Extracted

Family

stealc

http://185.172.128.24

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-1-5-21-1815711207-1844170477-3539718864-1000\Control Panel\International\Geo\Nation	file.exe

Loads dropped DLL 2 IoCs

pid	Process
1724	file.exe
1724	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
3300	1724	WerFault.exe	83

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	file.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	file.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1644	timeout.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1724	file.exe
1724	file.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1724 wrote to memory of 2336	1724	file.exe	91
PID 1724 wrote to memory of 2336	1724	file.exe	91
PID 1724 wrote to memory of 2336	1724	file.exe	91
PID 2336 wrote to memory of 1644	2336	cmd.exe	94
PID 2336 wrote to memory of 1644	2336	cmd.exe	94
PID 2336 wrote to memory of 1644	2336	cmd.exe	94

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:1724
- 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:2336
- - C:\Windows\SysWOW64\timeout.exe
    timeout /t 5
    3⤵
    - Delays execution with timeout.exe
    PID:1644
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1724 -s 2384
  2⤵
  - Program crash
  PID:3300

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 1724 -ip 1724
1⤵
PID:4684

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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nss3.dll

Path C:\ProgramData\nss3.dll
Size 1.2MB
SHA256 5d40ec9ef2e7674645196ff437aac8c5cc6e551a1cd4ee22ccb2003832efa84a
MD5 1299592bca7137b815d0a425ed128051
SHA1 3e0cf7b9b0a07f40efc6b2f83fa482ae620ae4bf
SHA512 22b6a1b62ee8ece814036e0bbb89137f86af33ca3fe75766c41da065cdc307dd5f081789c97b1153f6691c19e1c2c555a6acd5e358e4606da8388622b7864855
SSDEEP 24576:fEggtwf12gyTkHlnKGxJHxIB+y5GNIvxnnt7rczxISEYak3HFOsWYrVvE4C5mxVJ:fECf12gikHlnKGxJRIB+y5nvxnaOSJ35
MD5 SHA1 SHA512 SSDEEP

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memory/1724-4-0x0000000061E00000-0x0000000061EF3000-memory.dmp

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memory/1724-49-0x0000000000400000-0x000000000062E000-memory.dmp

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memory/1724-1-0x00000000008A0000-0x00000000009A0000-memory.dmp

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memory/1724-3-0x0000000000400000-0x000000000062E000-memory.dmp

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memory/1724-76-0x00000000008A0000-0x00000000009A0000-memory.dmp

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memory/1724-81-0x0000000000400000-0x000000000062E000-memory.dmp

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memory/1724-86-0x0000000002240000-0x000000000225C000-memory.dmp

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memory/1724-2-0x0000000002240000-0x000000000225C000-memory.dmp

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memory/1724-92-0x0000000000400000-0x000000000062E000-memory.dmp

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memory/1724-93-0x0000000000400000-0x000000000062E000-memory.dmp

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