buer | 1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509

General

Target

1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509.exe
Size

370KB
MD5

e112f7efdda2934f536911329c3cffd6
SHA1

06e0e207cb4ba22d8e3438295663fddd93cc22e9
SHA256

1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509
SHA512

a44fac08544dd6fe3ebcb9692ef85094c12a34795674f47cb095595876a48e479065b7d06de9440e8a5ad10206596722fab82013ab91da4e5350c84572861e2d
SSDEEP

6144:U7h79eEroX09/k5chVM7JwBJk6ojYcoqCDGIPgZg0CkYo13SNLfN+TAqne:G7AErJOGg6os2CDGIWd16fu7e

Score

10^/10

buer stealc default discovery loader spyware stealer

Malware Config

Extracted

Family

stealc

Botnet

default

C2

http://85.28.47.101

Attributes

url_path
/f3ee98d7eec07fb9.php

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

Loads dropped DLL 2 IoCs

pid	Process
2968	RegAsm.exe
2968	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 3936 set thread context of 2968	3936	1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509.exe	88

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
2968	RegAsm.exe
2968	RegAsm.exe
2968	RegAsm.exe
2968	RegAsm.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 3936 wrote to memory of 1536	3936	1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509.exe	85
PID 3936 wrote to memory of 1536	3936	1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509.exe	85
PID 3936 wrote to memory of 1536	3936	1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509.exe	85
PID 3936 wrote to memory of 4124	3936	1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509.exe	86
PID 3936 wrote to memory of 4124	3936	1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509.exe	86
PID 3936 wrote to memory of 4124	3936	1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509.exe	86
PID 3936 wrote to memory of 4928	3936	1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509.exe	87
PID 3936 wrote to memory of 4928	3936	1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509.exe	87
PID 3936 wrote to memory of 4928	3936	1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509.exe	87
PID 3936 wrote to memory of 2968	3936	1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509.exe	88
PID 3936 wrote to memory of 2968	3936	1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509.exe	88
PID 3936 wrote to memory of 2968	3936	1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509.exe	88
PID 3936 wrote to memory of 2968	3936	1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509.exe	88
PID 3936 wrote to memory of 2968	3936	1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509.exe	88
PID 3936 wrote to memory of 2968	3936	1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509.exe	88
PID 3936 wrote to memory of 2968	3936	1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509.exe	88
PID 3936 wrote to memory of 2968	3936	1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509.exe	88
PID 3936 wrote to memory of 2968	3936	1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509.exe	88

C:\Users\Admin\AppData\Local\Temp\1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509.exe
"C:\Users\Admin\AppData\Local\Temp\1b192b02fa917ebd5d710a3f9cbf937613ba252be7f3841631a5c729853de509.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3936
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:1536
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:4124
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:4928
- 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:2968

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/2968-1-0x0000000000400000-0x000000000063C000-memory.dmp

Filesize
2.2MB

Download
memory/2968-3-0x0000000000400000-0x000000000063C000-memory.dmp

Filesize
2.2MB

Download
memory/2968-4-0x0000000000400000-0x000000000063C000-memory.dmp

Filesize
2.2MB

Download
memory/2968-5-0x0000000061E00000-0x0000000061EF3000-memory.dmp

Filesize
972KB

Download
memory/2968-77-0x0000000000400000-0x000000000063C000-memory.dmp

Filesize
2.2MB

Download
memory/3936-0-0x0000000002E10000-0x0000000002E11000-memory.dmp

Filesize
4KB

Download

Analysis

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