buer | 4bc5903e3f847e2c0944215a52168fb4e7db034eb5724e2840b3396029cdfb0e

General

Target

4bc5903e3f847e2c0944215a52168fb4e7db034eb5724e2840b3396029cdfb0e.exe
Size

165KB
MD5

567cb2370a3c5521b1c343cce23126ac
SHA1

8fff0c1f83a78165d15711dc9dc6746c10299edf
SHA256

4bc5903e3f847e2c0944215a52168fb4e7db034eb5724e2840b3396029cdfb0e
SHA512

fed721ecf3d5f68e5cfe79466bf02ed8d0e4830cac60efee1af0ba8eba84f25651f041391aec37dfc6e84e454b56f4167d84c3df425e9441433be7d3b3a0c94b

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

C2

frrn8--_tgp_qsnnmpr,gldm86.6.-

cook5**\qdm\npkkjmo)diaj53+3+*

Signatures

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

Buer Loader 4 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/1636-132-0x0000000000690000-0x0000000000699000-memory.dmp	buer
behavioral2/memory/1636-135-0x0000000040000000-0x0000000041000000-memory.dmp	buer
behavioral2/memory/1636-138-0x0000000040000000-0x0000000041000000-memory.dmp	buer
behavioral2/memory/4544-142-0x0000000040000000-0x0000000041000000-memory.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
4544	manager.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce	manager.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\ActiveX Component = "C:\\Users\\Admin\\AppData\\Roaming\\ActiveX\\manager.exe"	manager.exe

Program crash 3 IoCs

pid	pid_target	Process	procid_target
2284	1636	WerFault.exe	78
236	4092	WerFault.exe	85
2020	4092	WerFault.exe	85

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4544	manager.exe
4544	manager.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 1636 wrote to memory of 4544	1636	4bc5903e3f847e2c0944215a52168fb4e7db034eb5724e2840b3396029cdfb0e.exe	80
PID 1636 wrote to memory of 4544	1636	4bc5903e3f847e2c0944215a52168fb4e7db034eb5724e2840b3396029cdfb0e.exe	80
PID 1636 wrote to memory of 4544	1636	4bc5903e3f847e2c0944215a52168fb4e7db034eb5724e2840b3396029cdfb0e.exe	80
PID 4544 wrote to memory of 4092	4544	manager.exe	85
PID 4544 wrote to memory of 4092	4544	manager.exe	85
PID 4544 wrote to memory of 4092	4544	manager.exe	85
PID 4544 wrote to memory of 4092	4544	manager.exe	85
PID 4544 wrote to memory of 4092	4544	manager.exe	85
PID 4544 wrote to memory of 4092	4544	manager.exe	85
PID 4544 wrote to memory of 4092	4544	manager.exe	85
PID 4544 wrote to memory of 4092	4544	manager.exe	85
PID 4544 wrote to memory of 4092	4544	manager.exe	85
PID 4544 wrote to memory of 4092	4544	manager.exe	85
PID 4544 wrote to memory of 4092	4544	manager.exe	85

C:\Users\Admin\AppData\Local\Temp\4bc5903e3f847e2c0944215a52168fb4e7db034eb5724e2840b3396029cdfb0e.exe
"C:\Users\Admin\AppData\Local\Temp\4bc5903e3f847e2c0944215a52168fb4e7db034eb5724e2840b3396029cdfb0e.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1636
- C:\Users\Admin\AppData\Roaming\ActiveX\manager.exe
  C:\Users\Admin\AppData\Roaming\ActiveX\manager.exe "C:\Users\Admin\AppData\Local\Temp\4bc5903e3f847e2c0944215a52168fb4e7db034eb5724e2840b3396029cdfb0e.exe" ensgJJ
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:4544
- - C:\Windows\SysWOW64\secinit.exe
    C:\Users\Admin\AppData\Roaming\ActiveX\manager.exe
    3⤵
    PID:4092
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4092 -s 268
      4⤵
      Program crash
      PID:236
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4092 -s 276
      4⤵
      Program crash
      PID:2020
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1636 -s 436
  2⤵
  - Program crash
  PID:2284

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1636 -ip 1636
1⤵
PID:948

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 4092 -ip 4092
1⤵
PID:460

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 484 -p 4092 -ip 4092
1⤵
PID:900

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\ActiveX\manager.exe

Filesize
165KB

MD5
567cb2370a3c5521b1c343cce23126ac

SHA1
8fff0c1f83a78165d15711dc9dc6746c10299edf

SHA256
4bc5903e3f847e2c0944215a52168fb4e7db034eb5724e2840b3396029cdfb0e

SHA512
fed721ecf3d5f68e5cfe79466bf02ed8d0e4830cac60efee1af0ba8eba84f25651f041391aec37dfc6e84e454b56f4167d84c3df425e9441433be7d3b3a0c94b

Download Submit
C:\Users\Admin\AppData\Roaming\ActiveX\manager.exe

Filesize
165KB

MD5
567cb2370a3c5521b1c343cce23126ac

SHA1
8fff0c1f83a78165d15711dc9dc6746c10299edf

SHA256
4bc5903e3f847e2c0944215a52168fb4e7db034eb5724e2840b3396029cdfb0e

SHA512
fed721ecf3d5f68e5cfe79466bf02ed8d0e4830cac60efee1af0ba8eba84f25651f041391aec37dfc6e84e454b56f4167d84c3df425e9441433be7d3b3a0c94b

Download Submit
memory/1636-131-0x0000000000736000-0x000000000073D000-memory.dmp

Filesize
28KB

Download
memory/1636-132-0x0000000000690000-0x0000000000699000-memory.dmp

Filesize
36KB

Download
memory/1636-130-0x0000000000736000-0x000000000073D000-memory.dmp

Filesize
28KB

Download
memory/1636-135-0x0000000040000000-0x0000000041000000-memory.dmp

Filesize
16.0MB

Download
memory/1636-137-0x0000000000736000-0x000000000073D000-memory.dmp

Filesize
28KB

Download
memory/1636-138-0x0000000040000000-0x0000000041000000-memory.dmp

Filesize
16.0MB

Download
memory/4092-143-0x0000000000600000-0x0000000001600000-memory.dmp

Filesize
16.0MB

Download
memory/4544-141-0x0000000000695000-0x000000000069C000-memory.dmp

Filesize
28KB

Download
memory/4544-142-0x0000000040000000-0x0000000041000000-memory.dmp

Filesize
16.0MB

Download
memory/4544-139-0x0000000000695000-0x000000000069C000-memory.dmp

Filesize
28KB

Download

Analysis

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