buer | 3045545357b095b5e32bf2d338ec052cf035d88ec6d2ddd06ce545eaa7eea573

General

Target

3045545357b095b5e32bf2d338ec052cf035d88ec6d2d.exe
Size

267KB
MD5

34ef5b293fc862e20476c63ac9b301a0
SHA1

486d3e1d2622f11ff0ae15fd7a7246dd7a45308a
SHA256

3045545357b095b5e32bf2d338ec052cf035d88ec6d2ddd06ce545eaa7eea573
SHA512

7dc1d7e8223a265a1237d1d962adbdc77348c1017d378d8c1736f70dd1aa58339b9f51eee143f5ca9496fd82c85c99a16a9ce21d3838de876c1dc6dc444560c2
SSDEEP

3072:/nWc7smXZcIM9/5E6H6NBTaDgpXVDCe5uY8gsGRimNZ6Zs:vWcpXZ3MB5tuTasDD558ERirZs

Score

10^/10

buer stealc discovery loader spyware stealer

Malware Config

Extracted

Family

stealc

C2

http://171.22.28.221

Attributes

url_path
/5c06c05b7b34e8e6.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
3068	cmd.exe

Loads dropped DLL 2 IoCs

pid	Process
2232	3045545357b095b5e32bf2d338ec052cf035d88ec6d2d.exe
2232	3045545357b095b5e32bf2d338ec052cf035d88ec6d2d.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

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	3045545357b095b5e32bf2d338ec052cf035d88ec6d2d.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	3045545357b095b5e32bf2d338ec052cf035d88ec6d2d.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2904	timeout.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2232	3045545357b095b5e32bf2d338ec052cf035d88ec6d2d.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 2232 wrote to memory of 3068	2232	3045545357b095b5e32bf2d338ec052cf035d88ec6d2d.exe	29
PID 2232 wrote to memory of 3068	2232	3045545357b095b5e32bf2d338ec052cf035d88ec6d2d.exe	29
PID 2232 wrote to memory of 3068	2232	3045545357b095b5e32bf2d338ec052cf035d88ec6d2d.exe	29
PID 2232 wrote to memory of 3068	2232	3045545357b095b5e32bf2d338ec052cf035d88ec6d2d.exe	29
PID 3068 wrote to memory of 2904	3068	cmd.exe	31
PID 3068 wrote to memory of 2904	3068	cmd.exe	31
PID 3068 wrote to memory of 2904	3068	cmd.exe	31
PID 3068 wrote to memory of 2904	3068	cmd.exe	31

C:\Users\Admin\AppData\Local\Temp\3045545357b095b5e32bf2d338ec052cf035d88ec6d2d.exe
"C:\Users\Admin\AppData\Local\Temp\3045545357b095b5e32bf2d338ec052cf035d88ec6d2d.exe"
1⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2232
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\system32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\3045545357b095b5e32bf2d338ec052cf035d88ec6d2d.exe" & del "C:\ProgramData\*.dll"" & exit
  2⤵
  - Deletes itself
  - Suspicious use of WriteProcessMemory
  PID:3068
- - C:\Windows\SysWOW64\timeout.exe
    timeout /t 5
    3⤵
    - Delays execution with timeout.exe
    PID:2904

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

2

T1552

Credentials In Files

2

T1552.001

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

2

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

\ProgramData\mozglue.dll

Filesize
593KB

MD5
c8fd9be83bc728cc04beffafc2907fe9

SHA1
95ab9f701e0024cedfbd312bcfe4e726744c4f2e

SHA256
ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a

SHA512
fbb446f4a27ef510e616caad52945d6c9cc1fd063812c41947e579ec2b54df57c6dc46237ded80fca5847f38cbe1747a6c66a13e2c8c19c664a72be35eb8b040

Download Submit
\ProgramData\nss3.dll

Filesize
2.0MB

MD5
1cc453cdf74f31e4d913ff9c10acdde2

SHA1
6e85eae544d6e965f15fa5c39700fa7202f3aafe

SHA256
ac5c92fe6c51cfa742e475215b83b3e11a4379820043263bf50d4068686c6fa5

SHA512
dd9ff4e06b00dc831439bab11c10e9b2ae864ea6e780d3835ea7468818f35439f352ef137da111efcdf2bb6465f6ca486719451bf6cf32c6a4420a56b1d64571

Download Submit
memory/2232-4-0x0000000061E00000-0x0000000061EF3000-memory.dmp

Filesize
972KB

Download
memory/2232-3-0x00000000003A0000-0x00000000003BB000-memory.dmp

Filesize
108KB

Download
memory/2232-2-0x0000000000400000-0x0000000000711000-memory.dmp

Filesize
3.1MB

Download
memory/2232-1-0x0000000000230000-0x0000000000330000-memory.dmp

Filesize
1024KB

Download
memory/2232-71-0x0000000000400000-0x0000000000711000-memory.dmp

Filesize
3.1MB

Download
memory/2232-72-0x0000000000230000-0x0000000000330000-memory.dmp

Filesize
1024KB

Download

Analysis

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