stealc | 3d07b09f83f2fc5dcb7f2429cac9a37160181da77df5a429e37b98dd685f239f

General

Target

3d07b09f83f2fc5dcb7f2429cac9a37160181da77df5a429e37b98dd685f239f.exe
Size

352KB
MD5

a74811b7e2d71612463144c69c0ca7e2
SHA1

900132a2213f70aed06e9982e47cfdcc8964b710
SHA256

3d07b09f83f2fc5dcb7f2429cac9a37160181da77df5a429e37b98dd685f239f
SHA512

c4c5bef04693f000ae1f45d2a2d28f67609f36a635464d5025a50b939eaf9cc8d7766355990847f5679375f3d4b760e035dd92914f754ae64df6923da1cecebe
SSDEEP

6144:IsCv/QNuZNjDPp9XC2Fgd6dwiJLR8ATGb5gBJYgEltzK5d5Sw+tuhdZUui/EO:I/+uZNjDPNGeR85+YgEf25CtuhLi/EO

Score

10^/10

stealc cuapfss discovery spyware stealer

Malware Config

Extracted

Family

stealc

Botnet

cuapfss

C2

http://23.88.106.134

Attributes

url_path
/6a9f8e2503d99c04.php

Signatures

Stealc
Stealc is an infostealer written in C++.
stealer stealc
Downloads MZ/PE file

Loads dropped DLL 2 IoCs

pid	Process
452	RegAsm.exe
452	RegAsm.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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3240 set thread context of 452	3240	3d07b09f83f2fc5dcb7f2429cac9a37160181da77df5a429e37b98dd685f239f.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 opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	RegAsm.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	RegAsm.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
452	RegAsm.exe
452	RegAsm.exe
452	RegAsm.exe
452	RegAsm.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3240 wrote to memory of 2912	3240	3d07b09f83f2fc5dcb7f2429cac9a37160181da77df5a429e37b98dd685f239f.exe	85
PID 3240 wrote to memory of 2912	3240	3d07b09f83f2fc5dcb7f2429cac9a37160181da77df5a429e37b98dd685f239f.exe	85
PID 3240 wrote to memory of 2912	3240	3d07b09f83f2fc5dcb7f2429cac9a37160181da77df5a429e37b98dd685f239f.exe	85
PID 3240 wrote to memory of 2600	3240	3d07b09f83f2fc5dcb7f2429cac9a37160181da77df5a429e37b98dd685f239f.exe	86
PID 3240 wrote to memory of 2600	3240	3d07b09f83f2fc5dcb7f2429cac9a37160181da77df5a429e37b98dd685f239f.exe	86
PID 3240 wrote to memory of 2600	3240	3d07b09f83f2fc5dcb7f2429cac9a37160181da77df5a429e37b98dd685f239f.exe	86
PID 3240 wrote to memory of 452	3240	3d07b09f83f2fc5dcb7f2429cac9a37160181da77df5a429e37b98dd685f239f.exe	87
PID 3240 wrote to memory of 452	3240	3d07b09f83f2fc5dcb7f2429cac9a37160181da77df5a429e37b98dd685f239f.exe	87
PID 3240 wrote to memory of 452	3240	3d07b09f83f2fc5dcb7f2429cac9a37160181da77df5a429e37b98dd685f239f.exe	87
PID 3240 wrote to memory of 452	3240	3d07b09f83f2fc5dcb7f2429cac9a37160181da77df5a429e37b98dd685f239f.exe	87
PID 3240 wrote to memory of 452	3240	3d07b09f83f2fc5dcb7f2429cac9a37160181da77df5a429e37b98dd685f239f.exe	87
PID 3240 wrote to memory of 452	3240	3d07b09f83f2fc5dcb7f2429cac9a37160181da77df5a429e37b98dd685f239f.exe	87
PID 3240 wrote to memory of 452	3240	3d07b09f83f2fc5dcb7f2429cac9a37160181da77df5a429e37b98dd685f239f.exe	87
PID 3240 wrote to memory of 452	3240	3d07b09f83f2fc5dcb7f2429cac9a37160181da77df5a429e37b98dd685f239f.exe	87
PID 3240 wrote to memory of 452	3240	3d07b09f83f2fc5dcb7f2429cac9a37160181da77df5a429e37b98dd685f239f.exe	87

C:\Users\Admin\AppData\Local\Temp\3d07b09f83f2fc5dcb7f2429cac9a37160181da77df5a429e37b98dd685f239f.exe
"C:\Users\Admin\AppData\Local\Temp\3d07b09f83f2fc5dcb7f2429cac9a37160181da77df5a429e37b98dd685f239f.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3240
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:2912
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:2600
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  PID:452

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

3

T1552

Credentials In Files

3

T1552.001

Discovery

Query Registry

2

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

3

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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
memory/452-1-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download
memory/452-5-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download
memory/452-6-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download
memory/452-7-0x0000000061E00000-0x0000000061EF3000-memory.dmp

Filesize
972KB

Download
memory/452-75-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download
memory/3240-0-0x0000000000DE0000-0x0000000000DE1000-memory.dmp

Filesize
4KB

Download
memory/3240-3-0x0000000000DE0000-0x0000000000DE1000-memory.dmp

Filesize
4KB

Download

Analysis

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