buer | 7d0eb3e819a8aad18bdcdf7f212c77663a79b3d048636878655dbe3730ff82ea

Analysis

max time kernel
118s
max time network
119s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
02-01-2024 23:07

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General

Target

syncUpd.exe
Size

206KB
MD5

0eb259c9bb69e54c47142edabc61c6c1
SHA1

992e444b163be213ecaa0bb1d12be5d74093a54d
SHA256

7d0eb3e819a8aad18bdcdf7f212c77663a79b3d048636878655dbe3730ff82ea
SHA512

fa271947f9785ad11115e2ea901d37f29e57a48dd0c87b5a498c00aff3cdec69033b44569522d3924444ae04c6c1e5b4a1710c35e24fd46acaf0c22ccf123e07
SSDEEP

3072:s3Lm1avguXOep+fJicd5t+thg1UpV2pFgrooLMMCS165DxZREYyUD:s3LmPgOep+zdJ1Up0pDoLrCT5yw

Score

10^/10

buer stealc discovery loader spyware stealer

Malware Config

Extracted

Family

stealc

http://185.172.128.79

Attributes

url_path
/3886d2276f6914c4.php

rc4.plain

Signatures

Buer
Buer is a new modular loader first seen in August 2019.
loader buer
Stealc
Stealc is an infostealer written in C++.
stealer stealc
Downloads MZ/PE file

Deletes itself 1 IoCs

pid	Process
576	cmd.exe

Loads dropped DLL 2 IoCs

pid	Process
2336	syncUpd.exe
2336	syncUpd.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

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

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
896	timeout.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2336	syncUpd.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 2336 wrote to memory of 576	2336	syncUpd.exe	33
PID 2336 wrote to memory of 576	2336	syncUpd.exe	33
PID 2336 wrote to memory of 576	2336	syncUpd.exe	33
PID 2336 wrote to memory of 576	2336	syncUpd.exe	33
PID 576 wrote to memory of 896	576	cmd.exe	31
PID 576 wrote to memory of 896	576	cmd.exe	31
PID 576 wrote to memory of 896	576	cmd.exe	31
PID 576 wrote to memory of 896	576	cmd.exe	31

C:\Users\Admin\AppData\Local\Temp\syncUpd.exe
"C:\Users\Admin\AppData\Local\Temp\syncUpd.exe"
1⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2336
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\system32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\syncUpd.exe" & del "C:\ProgramData\*.dll"" & exit
  2⤵
  - Deletes itself
  - Suspicious use of WriteProcessMemory
  PID:576

C:\Windows\SysWOW64\timeout.exe
timeout /t 5
1⤵
- Delays execution with timeout.exe
PID:896

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

memory/2336-1-0x0000000000230000-0x0000000000330000-memory.dmp

Filesize
1024KB

Download
memory/2336-2-0x00000000003A0000-0x00000000003BC000-memory.dmp

Filesize
112KB

Download
memory/2336-3-0x0000000000400000-0x000000000062E000-memory.dmp

Filesize
2.2MB

Download
memory/2336-4-0x0000000061E00000-0x0000000061EF3000-memory.dmp

Filesize
972KB

Download
memory/2336-36-0x0000000000400000-0x000000000062E000-memory.dmp

Filesize
2.2MB

Download
memory/2336-43-0x0000000000230000-0x0000000000330000-memory.dmp

Filesize
1024KB

Download
memory/2336-44-0x0000000000400000-0x000000000062E000-memory.dmp

Filesize
2.2MB

Download
memory/2336-63-0x0000000000400000-0x000000000062E000-memory.dmp

Filesize
2.2MB

Download
memory/2336-67-0x0000000000400000-0x000000000062E000-memory.dmp

Filesize
2.2MB

Download
memory/2336-76-0x0000000000230000-0x0000000000330000-memory.dmp

Filesize
1024KB

Download
memory/2336-75-0x0000000000400000-0x000000000062E000-memory.dmp

Filesize
2.2MB

Download