stealc | 3d07b09f83f2fc5dcb7f2429cac9a37160181da77df5a429e37b98dd685f239f

General

Target

a74811b7e2d71612463144c69c0ca7e2.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
3864	RegAsm.exe
3864	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 2960 set thread context of 3864	2960	a74811b7e2d71612463144c69c0ca7e2.exe	93

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 22 IoCs

pid	Process
3864	RegAsm.exe
3864	RegAsm.exe
3864	RegAsm.exe
3864	RegAsm.exe
3864	RegAsm.exe
3864	RegAsm.exe
3864	RegAsm.exe
3864	RegAsm.exe
3864	RegAsm.exe
3864	RegAsm.exe
3864	RegAsm.exe
3864	RegAsm.exe
3864	RegAsm.exe
3864	RegAsm.exe
3864	RegAsm.exe
3864	RegAsm.exe
3864	RegAsm.exe
3864	RegAsm.exe
3864	RegAsm.exe
3864	RegAsm.exe
3864	RegAsm.exe
3864	RegAsm.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2960 wrote to memory of 3864	2960	a74811b7e2d71612463144c69c0ca7e2.exe	93
PID 2960 wrote to memory of 3864	2960	a74811b7e2d71612463144c69c0ca7e2.exe	93
PID 2960 wrote to memory of 3864	2960	a74811b7e2d71612463144c69c0ca7e2.exe	93
PID 2960 wrote to memory of 3864	2960	a74811b7e2d71612463144c69c0ca7e2.exe	93
PID 2960 wrote to memory of 3864	2960	a74811b7e2d71612463144c69c0ca7e2.exe	93
PID 2960 wrote to memory of 3864	2960	a74811b7e2d71612463144c69c0ca7e2.exe	93
PID 2960 wrote to memory of 3864	2960	a74811b7e2d71612463144c69c0ca7e2.exe	93
PID 2960 wrote to memory of 3864	2960	a74811b7e2d71612463144c69c0ca7e2.exe	93
PID 2960 wrote to memory of 3864	2960	a74811b7e2d71612463144c69c0ca7e2.exe	93

C:\Users\Admin\AppData\Local\Temp\a74811b7e2d71612463144c69c0ca7e2.exe
"C:\Users\Admin\AppData\Local\Temp\a74811b7e2d71612463144c69c0ca7e2.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2960
- 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:3864

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-appcompat-clear --field-trial-handle=3608,i,1999448010053300448,1112699187621658374,262144 --variations-seed-version --mojo-platform-channel-handle=2552 /prefetch:3
1⤵
PID:804

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --field-trial-handle=4228,i,1999448010053300448,1112699187621658374,262144 --variations-seed-version --mojo-platform-channel-handle=3612 /prefetch:8
1⤵
PID:4556

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

Loading Replay Monitor...

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
C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\Network\SCT Auditing Pending Reports

Filesize
2B

MD5
d751713988987e9331980363e24189ce

SHA1
97d170e1550eee4afc0af065b78cda302a97674c

SHA256
4f53cda18c2baa0c0354bb5f9a3ecbe5ed12ab4d8e11ba873c2f11161202b945

SHA512
b25b294cb4deb69ea00a4c3cf3113904801b6015e5956bd019a8570b1fe1d6040e944ef3cdee16d0a46503ca6e659a25f21cf9ceddc13f352a3c98138c15d6af

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\Network\Sdch Dictionaries

Filesize
40B

MD5
20d4b8fa017a12a108c87f540836e250

SHA1
1ac617fac131262b6d3ce1f52f5907e31d5f6f00

SHA256
6028bd681dbf11a0a58dde8a0cd884115c04caa59d080ba51bde1b086ce0079d

SHA512
507b2b8a8a168ff8f2bdafa5d9d341c44501a5f17d9f63f3d43bd586bc9e8ae33221887869fa86f845b7d067cb7d2a7009efd71dda36e03a40a74fee04b86856

Download Submit
memory/2960-0-0x00000000003F0000-0x00000000003F1000-memory.dmp

Filesize
4KB

Download
memory/2960-2-0x00000000003F0000-0x00000000003F1000-memory.dmp

Filesize
4KB

Download
memory/3864-1-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download
memory/3864-4-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download
memory/3864-5-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download
memory/3864-6-0x0000000061E00000-0x0000000061EF3000-memory.dmp

Filesize
972KB

Download
memory/3864-80-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download

Analysis

Sharing