buer | b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0

General

Target

b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0_JC.exe
Size

192KB
MD5

81cbb0338bea846c1163fc19b5a9c174
SHA1

9a9ea1ff3704166d4b76838b17159987e30207e8
SHA256

b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0
SHA512

3bf7e26bcd46e80d026f5b2d6fab82fcae56a3e380d9a88f2ee876539037016467adffbd01043e20191b5e83687457a4ce936178bdc38a49e493f55656537ac8
SSDEEP

3072:ObhQVe2GRs9ABW7z0QrTauJFFco5cAIp9BAVf2SR3b:HwFs9AsEQfC9jBAVfh

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

C2

https://165.232.118.210/

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

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\fca88cf5f25c50a394b0\\gennt.exe\""	gennt.exe

Buer Loader 4 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral1/memory/2616-0-0x0000000000230000-0x000000000023F000-memory.dmp	buer
behavioral1/memory/2616-5-0x0000000040000000-0x000000004000C000-memory.dmp	buer
behavioral1/memory/2616-2-0x0000000000220000-0x000000000022D000-memory.dmp	buer
behavioral1/memory/3064-16-0x0000000000240000-0x000000000024F000-memory.dmp	buer

Deletes itself 1 IoCs

pid	Process
3064	gennt.exe

Executes dropped EXE 1 IoCs

pid	Process
3064	gennt.exe

Loads dropped DLL 2 IoCs

pid	Process
2616	b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0_JC.exe
2616	b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0_JC.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2480	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2480	powershell.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 2616 wrote to memory of 3064	2616	b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0_JC.exe	30
PID 2616 wrote to memory of 3064	2616	b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0_JC.exe	30
PID 2616 wrote to memory of 3064	2616	b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0_JC.exe	30
PID 2616 wrote to memory of 3064	2616	b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0_JC.exe	30
PID 3064 wrote to memory of 2480	3064	gennt.exe	31
PID 3064 wrote to memory of 2480	3064	gennt.exe	31
PID 3064 wrote to memory of 2480	3064	gennt.exe	31
PID 3064 wrote to memory of 2480	3064	gennt.exe	31

C:\Users\Admin\AppData\Local\Temp\b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0_JC.exe
"C:\Users\Admin\AppData\Local\Temp\b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0_JC.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:2616
- C:\ProgramData\fca88cf5f25c50a394b0\gennt.exe
  C:\ProgramData\fca88cf5f25c50a394b0\gennt.exe "C:\Users\Admin\AppData\Local\Temp\b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0_JC.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Deletes itself
  - Executes dropped EXE
  - Suspicious use of WriteProcessMemory
  PID:3064
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\fca88cf5f25c50a394b0}"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2480

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

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\fca88cf5f25c50a394b0\gennt.exe

Filesize
192KB

MD5
81cbb0338bea846c1163fc19b5a9c174

SHA1
9a9ea1ff3704166d4b76838b17159987e30207e8

SHA256
b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0

SHA512
3bf7e26bcd46e80d026f5b2d6fab82fcae56a3e380d9a88f2ee876539037016467adffbd01043e20191b5e83687457a4ce936178bdc38a49e493f55656537ac8

Download Submit
C:\ProgramData\fca88cf5f25c50a394b0\gennt.exe

Filesize
192KB

MD5
81cbb0338bea846c1163fc19b5a9c174

SHA1
9a9ea1ff3704166d4b76838b17159987e30207e8

SHA256
b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0

SHA512
3bf7e26bcd46e80d026f5b2d6fab82fcae56a3e380d9a88f2ee876539037016467adffbd01043e20191b5e83687457a4ce936178bdc38a49e493f55656537ac8

Download Submit
\ProgramData\fca88cf5f25c50a394b0\gennt.exe

Filesize
192KB

MD5
81cbb0338bea846c1163fc19b5a9c174

SHA1
9a9ea1ff3704166d4b76838b17159987e30207e8

SHA256
b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0

SHA512
3bf7e26bcd46e80d026f5b2d6fab82fcae56a3e380d9a88f2ee876539037016467adffbd01043e20191b5e83687457a4ce936178bdc38a49e493f55656537ac8

Download Submit
\ProgramData\fca88cf5f25c50a394b0\gennt.exe

Filesize
192KB

MD5
81cbb0338bea846c1163fc19b5a9c174

SHA1
9a9ea1ff3704166d4b76838b17159987e30207e8

SHA256
b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0

SHA512
3bf7e26bcd46e80d026f5b2d6fab82fcae56a3e380d9a88f2ee876539037016467adffbd01043e20191b5e83687457a4ce936178bdc38a49e493f55656537ac8

Download Submit
memory/2480-25-0x00000000744D0000-0x0000000074A7B000-memory.dmp

Filesize
5.7MB

Download
memory/2480-26-0x00000000744D0000-0x0000000074A7B000-memory.dmp

Filesize
5.7MB

Download
memory/2480-27-0x00000000026A0000-0x00000000026E0000-memory.dmp

Filesize
256KB

Download
memory/2480-28-0x00000000026A0000-0x00000000026E0000-memory.dmp

Filesize
256KB

Download
memory/2480-29-0x00000000744D0000-0x0000000074A7B000-memory.dmp

Filesize
5.7MB

Download
memory/2616-0-0x0000000000230000-0x000000000023F000-memory.dmp

Filesize
60KB

Download
memory/2616-2-0x0000000000220000-0x000000000022D000-memory.dmp

Filesize
52KB

Download
memory/2616-5-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download
memory/3064-16-0x0000000000240000-0x000000000024F000-memory.dmp

Filesize
60KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads