buer | 86ff58151ec691f3072cdf6226c7b356537022a2d1b7a73e63aeee639346933c

General

Target

86ff58151ec691f3072cdf6226c7b356537022a2d1b7a73e63aeee639346933c.exe
Size

215KB
MD5

e3149d988edfdabe27e8a4902a784d2a
SHA1

ab259a9c37c60698a2544297671b39235df1aaae
SHA256

86ff58151ec691f3072cdf6226c7b356537022a2d1b7a73e63aeee639346933c
SHA512

865e5f67cab098860ac2598831c564691e90966d015080279eac1fac5ee4c73cc85975498da61833a74f0ea03020418c354aa7b96312ca53eed7e331cf658878

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

C2

https://217.8.117.20:4443/

http://217.8.117.20:8080/

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-1-5-21-1809750270-3141839489-3074374771-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\UBlockPlugin\\plugin.exe\""	plugin.exe

Buer Loader 3 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/4412-134-0x0000000000030000-0x000000000003A000-memory.dmp	buer
behavioral2/memory/4412-135-0x0000000040000000-0x0000000040066000-memory.dmp	buer
behavioral2/memory/880-138-0x0000000040000000-0x0000000040066000-memory.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
880	plugin.exe

Program crash 2 IoCs

pid	pid_target	Process	procid_target
1280	4412	WerFault.exe	79
3556	4616	WerFault.exe	85

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
880	plugin.exe
880	plugin.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4412 wrote to memory of 880	4412	86ff58151ec691f3072cdf6226c7b356537022a2d1b7a73e63aeee639346933c.exe	80
PID 4412 wrote to memory of 880	4412	86ff58151ec691f3072cdf6226c7b356537022a2d1b7a73e63aeee639346933c.exe	80
PID 4412 wrote to memory of 880	4412	86ff58151ec691f3072cdf6226c7b356537022a2d1b7a73e63aeee639346933c.exe	80
PID 880 wrote to memory of 4616	880	plugin.exe	85
PID 880 wrote to memory of 4616	880	plugin.exe	85
PID 880 wrote to memory of 4616	880	plugin.exe	85
PID 880 wrote to memory of 4616	880	plugin.exe	85
PID 880 wrote to memory of 4616	880	plugin.exe	85
PID 880 wrote to memory of 4616	880	plugin.exe	85
PID 880 wrote to memory of 4616	880	plugin.exe	85
PID 880 wrote to memory of 4616	880	plugin.exe	85
PID 880 wrote to memory of 4616	880	plugin.exe	85
PID 880 wrote to memory of 4616	880	plugin.exe	85
PID 880 wrote to memory of 4616	880	plugin.exe	85

C:\Users\Admin\AppData\Local\Temp\86ff58151ec691f3072cdf6226c7b356537022a2d1b7a73e63aeee639346933c.exe
"C:\Users\Admin\AppData\Local\Temp\86ff58151ec691f3072cdf6226c7b356537022a2d1b7a73e63aeee639346933c.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4412
- C:\ProgramData\UBlockPlugin\plugin.exe
  C:\ProgramData\UBlockPlugin\plugin.exe "C:\Users\Admin\AppData\Local\Temp\86ff58151ec691f3072cdf6226c7b356537022a2d1b7a73e63aeee639346933c.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:880
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\UBlockPlugin\plugin.exe
    3⤵
    PID:4616
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4616 -s 220
      4⤵
      Program crash
      PID:3556
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4412 -s 472
  2⤵
  - Program crash
  PID:1280

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 4412 -ip 4412
1⤵
PID:1632

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 496 -p 4616 -ip 4616
1⤵
PID:4508

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

1

T1004

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\ProgramData\UBlockPlugin\plugin.exe

Filesize
215KB

MD5
e3149d988edfdabe27e8a4902a784d2a

SHA1
ab259a9c37c60698a2544297671b39235df1aaae

SHA256
86ff58151ec691f3072cdf6226c7b356537022a2d1b7a73e63aeee639346933c

SHA512
865e5f67cab098860ac2598831c564691e90966d015080279eac1fac5ee4c73cc85975498da61833a74f0ea03020418c354aa7b96312ca53eed7e331cf658878

Download Submit
C:\ProgramData\UBlockPlugin\plugin.exe

Filesize
215KB

MD5
e3149d988edfdabe27e8a4902a784d2a

SHA1
ab259a9c37c60698a2544297671b39235df1aaae

SHA256
86ff58151ec691f3072cdf6226c7b356537022a2d1b7a73e63aeee639346933c

SHA512
865e5f67cab098860ac2598831c564691e90966d015080279eac1fac5ee4c73cc85975498da61833a74f0ea03020418c354aa7b96312ca53eed7e331cf658878

Download Submit
memory/880-137-0x0000000000494000-0x000000000049B000-memory.dmp

Filesize
28KB

Download
memory/880-138-0x0000000040000000-0x0000000040066000-memory.dmp

Filesize
408KB

Download
memory/4412-134-0x0000000000030000-0x000000000003A000-memory.dmp

Filesize
40KB

Download
memory/4412-133-0x0000000000694000-0x000000000069B000-memory.dmp

Filesize
28KB

Download
memory/4412-135-0x0000000040000000-0x0000000040066000-memory.dmp

Filesize
408KB

Download
memory/4616-139-0x0000000001010000-0x0000000001076000-memory.dmp

Filesize
408KB

Download

Analysis

Sharing