buer | 5860aa99f2728d1fe095387575f210cea1ca41a4a1c1d12f276ea7784413c186

Analysis

max time kernel
160s
max time network
166s
platform
windows10-2004_x64
resource
win10v2004-20220414-en
submitted
01/07/2022, 04:11

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General

Target
5860aa99f2728d1fe095387575f210cea1ca41a4a1c1d12f276ea7784413c186.exe
Size 232KB
Sample220701-esbnaadcg2
SHA256 5860aa99f2728d1fe095387575f210cea1ca41a4a1c1d12f276ea7784413c186
MD5 433d6c179b52282f730f84bdf722f0dc
SHA1 9a4aab9d9c9cef5f1ac2c1135e49957e4f85befd
SHA512 0194168071a278982fb152fd0c63aa30def25db18edf6784163ba41617fab7fec368f391a40337efdbf305905c8d58c3202edcfd4e290c90509ea6a5f7a6de10
MD5 SHA1 SHA512

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

http://45.12.32.252:8080/

Signatures

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

Buer Loader 5 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/4056-132-0x0000000000470000-0x0000000000479000-memory.dmp	buer
behavioral2/memory/4056-138-0x0000000040000000-0x000000004318E000-memory.dmp	buer
behavioral2/memory/3080-139-0x0000000000650000-0x0000000000659000-memory.dmp	buer
behavioral2/memory/3080-140-0x0000000040000000-0x000000004318E000-memory.dmp	buer
behavioral2/memory/3080-143-0x0000000040000000-0x000000004318E000-memory.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
3080	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
1908	4056	WerFault.exe	78
1208	736	WerFault.exe	83
2492	736	WerFault.exe	83

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3080	manager.exe
3080	manager.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 4056 wrote to memory of 3080	4056	5860aa99f2728d1fe095387575f210cea1ca41a4a1c1d12f276ea7784413c186.exe	79
PID 4056 wrote to memory of 3080	4056	5860aa99f2728d1fe095387575f210cea1ca41a4a1c1d12f276ea7784413c186.exe	79
PID 4056 wrote to memory of 3080	4056	5860aa99f2728d1fe095387575f210cea1ca41a4a1c1d12f276ea7784413c186.exe	79
PID 3080 wrote to memory of 736	3080	manager.exe	83
PID 3080 wrote to memory of 736	3080	manager.exe	83
PID 3080 wrote to memory of 736	3080	manager.exe	83
PID 3080 wrote to memory of 736	3080	manager.exe	83
PID 3080 wrote to memory of 736	3080	manager.exe	83
PID 3080 wrote to memory of 736	3080	manager.exe	83
PID 3080 wrote to memory of 736	3080	manager.exe	83
PID 3080 wrote to memory of 736	3080	manager.exe	83
PID 3080 wrote to memory of 736	3080	manager.exe	83
PID 3080 wrote to memory of 736	3080	manager.exe	83
PID 3080 wrote to memory of 736	3080	manager.exe	83
PID 3080 wrote to memory of 736	3080	manager.exe	83
PID 3080 wrote to memory of 736	3080	manager.exe	83

C:\Users\Admin\AppData\Local\Temp\5860aa99f2728d1fe095387575f210cea1ca41a4a1c1d12f276ea7784413c186.exe
"C:\Users\Admin\AppData\Local\Temp\5860aa99f2728d1fe095387575f210cea1ca41a4a1c1d12f276ea7784413c186.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4056
- C:\Users\Admin\AppData\Roaming\ActiveX\manager.exe
  C:\Users\Admin\AppData\Roaming\ActiveX\manager.exe "C:\Users\Admin\AppData\Local\Temp\5860aa99f2728d1fe095387575f210cea1ca41a4a1c1d12f276ea7784413c186.exe" ensgJJ
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:3080
- - C:\Windows\SysWOW64\secinit.exe
    C:\Users\Admin\AppData\Roaming\ActiveX\manager.exe
    3⤵
    PID:736
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 736 -s 268
      4⤵
      Program crash
      PID:1208
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 736 -s 288
      4⤵
      Program crash
      PID:2492
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4056 -s 436
  2⤵
  - Program crash
  PID:1908

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4056 -ip 4056
1⤵
PID:3344

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 736 -ip 736
1⤵
PID:1304

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 736 -ip 736
1⤵
PID:2436

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

manager.exe

Path C:\Users\Admin\AppData\Roaming\ActiveX\manager.exe
Size 232KB
SHA256 5860aa99f2728d1fe095387575f210cea1ca41a4a1c1d12f276ea7784413c186
MD5 433d6c179b52282f730f84bdf722f0dc
SHA1 9a4aab9d9c9cef5f1ac2c1135e49957e4f85befd
SHA512 0194168071a278982fb152fd0c63aa30def25db18edf6784163ba41617fab7fec368f391a40337efdbf305905c8d58c3202edcfd4e290c90509ea6a5f7a6de10
SSDEEP 3072:GLDQ0JrU31bwRKbPmP7W8D1uvb55PWTtRdYEEuU7P7EF6HG8YNZ:GnQ0loqj7Wg1qb4RdTEhw8G8A
MD5 SHA1 SHA512 SSDEEP

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manager.exe

Path C:\Users\Admin\AppData\Roaming\ActiveX\manager.exe
Size 232KB
SHA256 5860aa99f2728d1fe095387575f210cea1ca41a4a1c1d12f276ea7784413c186
MD5 433d6c179b52282f730f84bdf722f0dc
SHA1 9a4aab9d9c9cef5f1ac2c1135e49957e4f85befd
SHA512 0194168071a278982fb152fd0c63aa30def25db18edf6784163ba41617fab7fec368f391a40337efdbf305905c8d58c3202edcfd4e290c90509ea6a5f7a6de10
SSDEEP 3072:GLDQ0JrU31bwRKbPmP7W8D1uvb55PWTtRdYEEuU7P7EF6HG8YNZ:GnQ0loqj7Wg1qb4RdTEhw8G8A
MD5 SHA1 SHA512 SSDEEP

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memory/736-141-0x0000000000760000-0x00000000038EE000-memory.dmp

Download

memory/3080-136-0x0000000000725000-0x000000000072C000-memory.dmp

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memory/3080-139-0x0000000000650000-0x0000000000659000-memory.dmp

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memory/3080-140-0x0000000040000000-0x000000004318E000-memory.dmp

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memory/3080-142-0x0000000000725000-0x000000000072C000-memory.dmp

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memory/3080-143-0x0000000040000000-0x000000004318E000-memory.dmp

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memory/4056-130-0x0000000000595000-0x000000000059C000-memory.dmp

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memory/4056-132-0x0000000000470000-0x0000000000479000-memory.dmp

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memory/4056-138-0x0000000040000000-0x000000004318E000-memory.dmp

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memory/4056-131-0x0000000000595000-0x000000000059C000-memory.dmp

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