buer | 934e5538341e13807b5a173776e947596814f9dd2fd179e8373d70f2b6170b24

Analysis

max time kernel
158s
max time network
164s
platform
windows10-2004_x64
resource
win10v2004-20220414-en
submitted
01/07/2022, 03:06

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General

Target
934e5538341e13807b5a173776e947596814f9dd2fd179e8373d70f2b6170b24.exe
Size 239KB
Sample220701-dlqcesbce9
SHA256 934e5538341e13807b5a173776e947596814f9dd2fd179e8373d70f2b6170b24
MD5 d9c64a5e7e3dd6aece2ae1dadba56b8f
SHA1 e898639ea0f46754acd5d9102145e09602341ba7
SHA512 317bbcbca132cfe33c84628af0765139c3b0c93c6f2f9b7e3047c378b64727eb40087e3a869e9014591cb126d7cf7a7e53e1ae183deab26755dfffdfbc87c097
MD5 SHA1 SHA512

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

http://appnoder11113.info/
http://45.138.157.17/

Signatures

Buer
Buer is a new modular loader first seen in August 2019.
loader buer

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\UBlockPlugin\\plugin.exe\""	plugin.exe

Buer Loader 4 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/4124-134-0x0000000000030000-0x0000000000039000-memory.dmp	buer
behavioral2/memory/4124-135-0x0000000040000000-0x00000000432E4000-memory.dmp	buer
behavioral2/memory/4260-138-0x0000000040000000-0x00000000432E4000-memory.dmp	buer
behavioral2/memory/4260-143-0x0000000040000000-0x00000000432E4000-memory.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
4260	plugin.exe

Program crash 8 IoCs

pid	pid_target	Process	procid_target
2096	4260	WerFault.exe	77
2348	4260	WerFault.exe	77
1500	4260	WerFault.exe	77
4344	4260	WerFault.exe	77
852	4260	WerFault.exe	77
3700	3912	WerFault.exe	78
3524	3912	WerFault.exe	78
2448	4260	WerFault.exe	77

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4260	plugin.exe
4260	plugin.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4124 wrote to memory of 4260	4124	934e5538341e13807b5a173776e947596814f9dd2fd179e8373d70f2b6170b24.exe	77
PID 4124 wrote to memory of 4260	4124	934e5538341e13807b5a173776e947596814f9dd2fd179e8373d70f2b6170b24.exe	77
PID 4124 wrote to memory of 4260	4124	934e5538341e13807b5a173776e947596814f9dd2fd179e8373d70f2b6170b24.exe	77
PID 4260 wrote to memory of 3912	4260	plugin.exe	78
PID 4260 wrote to memory of 3912	4260	plugin.exe	78
PID 4260 wrote to memory of 3912	4260	plugin.exe	78
PID 4260 wrote to memory of 3912	4260	plugin.exe	78
PID 4260 wrote to memory of 3912	4260	plugin.exe	78
PID 4260 wrote to memory of 3912	4260	plugin.exe	78
PID 4260 wrote to memory of 3912	4260	plugin.exe	78
PID 4260 wrote to memory of 3912	4260	plugin.exe	78
PID 4260 wrote to memory of 3912	4260	plugin.exe	78
PID 4260 wrote to memory of 3912	4260	plugin.exe	78
PID 4260 wrote to memory of 3912	4260	plugin.exe	78
PID 4260 wrote to memory of 3912	4260	plugin.exe	78

C:\Users\Admin\AppData\Local\Temp\934e5538341e13807b5a173776e947596814f9dd2fd179e8373d70f2b6170b24.exe
"C:\Users\Admin\AppData\Local\Temp\934e5538341e13807b5a173776e947596814f9dd2fd179e8373d70f2b6170b24.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4124
- C:\ProgramData\UBlockPlugin\plugin.exe
  C:\ProgramData\UBlockPlugin\plugin.exe "C:\Users\Admin\AppData\Local\Temp\934e5538341e13807b5a173776e947596814f9dd2fd179e8373d70f2b6170b24.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:4260
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\UBlockPlugin\plugin.exe
    3⤵
    PID:3912
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3912 -s 220
      4⤵
      Program crash
      PID:3700
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3912 -s 228
      4⤵
      Program crash
      PID:3524
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4260 -s 732
    3⤵
    - Program crash
    PID:2096
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4260 -s 768
    3⤵
    - Program crash
    PID:2348
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4260 -s 868
    3⤵
    - Program crash
    PID:1500
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4260 -s 896
    3⤵
    - Program crash
    PID:4344
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4260 -s 752
    3⤵
    - Program crash
    PID:852
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4260 -s 740
    3⤵
    - Program crash
    PID:2448

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 4260 -ip 4260
1⤵
PID:3664

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 4260 -ip 4260
1⤵
PID:4340

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 4260 -ip 4260
1⤵
PID:1708

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 4260 -ip 4260
1⤵
PID:4520

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 4260 -ip 4260
1⤵
PID:5076

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 3912 -ip 3912
1⤵
PID:1152

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 3912 -ip 3912
1⤵
PID:5008

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 4260 -ip 4260
1⤵
PID:1436

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

plugin.exe

Path C:\ProgramData\UBlockPlugin\plugin.exe
Size 239KB
SHA256 934e5538341e13807b5a173776e947596814f9dd2fd179e8373d70f2b6170b24
MD5 d9c64a5e7e3dd6aece2ae1dadba56b8f
SHA1 e898639ea0f46754acd5d9102145e09602341ba7
SHA512 317bbcbca132cfe33c84628af0765139c3b0c93c6f2f9b7e3047c378b64727eb40087e3a869e9014591cb126d7cf7a7e53e1ae183deab26755dfffdfbc87c097
SSDEEP 3072:L1H4FdrzyEnk9bc+8aN+nfz3yIg6+U8Wozy1WZ:5oXk9b2zfz3hdL8n21W
MD5 SHA1 SHA512 SSDEEP

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plugin.exe

Path C:\ProgramData\UBlockPlugin\plugin.exe
Size 239KB
SHA256 934e5538341e13807b5a173776e947596814f9dd2fd179e8373d70f2b6170b24
MD5 d9c64a5e7e3dd6aece2ae1dadba56b8f
SHA1 e898639ea0f46754acd5d9102145e09602341ba7
SHA512 317bbcbca132cfe33c84628af0765139c3b0c93c6f2f9b7e3047c378b64727eb40087e3a869e9014591cb126d7cf7a7e53e1ae183deab26755dfffdfbc87c097
SSDEEP 3072:L1H4FdrzyEnk9bc+8aN+nfz3yIg6+U8Wozy1WZ:5oXk9b2zfz3hdL8n21W
MD5 SHA1 SHA512 SSDEEP

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memory/3912-139-0x0000000000C50000-0x0000000003F34000-memory.dmp

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memory/3912-141-0x0000000000C50000-0x0000000003F34000-memory.dmp

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memory/4124-133-0x00000000005E1000-0x00000000005E8000-memory.dmp

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memory/4124-134-0x0000000000030000-0x0000000000039000-memory.dmp

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memory/4124-135-0x0000000040000000-0x00000000432E4000-memory.dmp

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memory/4124-140-0x0000000040000000-0x00000000432E4000-memory.dmp

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memory/4260-137-0x0000000000541000-0x0000000000548000-memory.dmp

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memory/4260-138-0x0000000040000000-0x00000000432E4000-memory.dmp

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memory/4260-142-0x0000000000541000-0x0000000000548000-memory.dmp

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memory/4260-143-0x0000000040000000-0x00000000432E4000-memory.dmp

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