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\\77c0a378941bbd79083b\\gennt.exe\""	gennt.exe

Buer Loader 4 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/2968-0-0x00000000021C0000-0x00000000021CD000-memory.dmp	buer
behavioral2/memory/2968-1-0x00000000021D0000-0x00000000021DF000-memory.dmp	buer
behavioral2/memory/2968-5-0x0000000040000000-0x000000004000C000-memory.dmp	buer
behavioral2/memory/1872-12-0x0000000001F50000-0x0000000001F5F000-memory.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
1872	gennt.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
5004	powershell.exe
5004	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	5004	powershell.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2968 wrote to memory of 1872	2968	b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0_JC.exe	91
PID 2968 wrote to memory of 1872	2968	b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0_JC.exe	91
PID 2968 wrote to memory of 1872	2968	b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0_JC.exe	91
PID 1872 wrote to memory of 5004	1872	gennt.exe	92
PID 1872 wrote to memory of 5004	1872	gennt.exe	92
PID 1872 wrote to memory of 5004	1872	gennt.exe	92

C:\Users\Admin\AppData\Local\Temp\b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0_JC.exe
"C:\Users\Admin\AppData\Local\Temp\b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0_JC.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2968
- C:\ProgramData\77c0a378941bbd79083b\gennt.exe
  C:\ProgramData\77c0a378941bbd79083b\gennt.exe "C:\Users\Admin\AppData\Local\Temp\b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0_JC.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Executes dropped EXE
  - Suspicious use of WriteProcessMemory
  PID:1872
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\77c0a378941bbd79083b}"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:5004

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

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Downloads

C:\ProgramData\77c0a378941bbd79083b\gennt.exe

Filesize
192KB

MD5
81cbb0338bea846c1163fc19b5a9c174

SHA1
9a9ea1ff3704166d4b76838b17159987e30207e8

SHA256
b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0

SHA512
3bf7e26bcd46e80d026f5b2d6fab82fcae56a3e380d9a88f2ee876539037016467adffbd01043e20191b5e83687457a4ce936178bdc38a49e493f55656537ac8

Download Submit
C:\ProgramData\77c0a378941bbd79083b\gennt.exe

Filesize
192KB

MD5
81cbb0338bea846c1163fc19b5a9c174

SHA1
9a9ea1ff3704166d4b76838b17159987e30207e8

SHA256
b6baee7c17b0c7603c639172e6ff9f642ce4508ba64afedf969a3608204c64e0

SHA512
3bf7e26bcd46e80d026f5b2d6fab82fcae56a3e380d9a88f2ee876539037016467adffbd01043e20191b5e83687457a4ce936178bdc38a49e493f55656537ac8

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_1wuralol.lz1.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1872-12-0x0000000001F50000-0x0000000001F5F000-memory.dmp

Filesize
60KB

Download
memory/2968-0-0x00000000021C0000-0x00000000021CD000-memory.dmp

Filesize
52KB

Download
memory/2968-1-0x00000000021D0000-0x00000000021DF000-memory.dmp

Filesize
60KB

Download
memory/2968-5-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download
memory/5004-25-0x0000000005920000-0x0000000005986000-memory.dmp

Filesize
408KB

Download
memory/5004-37-0x00000000065B0000-0x00000000065E2000-memory.dmp

Filesize
200KB

Download
memory/5004-22-0x0000000005240000-0x0000000005868000-memory.dmp

Filesize
6.2MB

Download
memory/5004-23-0x0000000005080000-0x00000000050A2000-memory.dmp

Filesize
136KB

Download
memory/5004-24-0x0000000005120000-0x0000000005186000-memory.dmp

Filesize
408KB

Download
memory/5004-20-0x0000000004C00000-0x0000000004C10000-memory.dmp

Filesize
64KB

Download
memory/5004-19-0x0000000074A40000-0x00000000751F0000-memory.dmp

Filesize
7.7MB

Download
memory/5004-35-0x0000000005FE0000-0x0000000005FFE000-memory.dmp

Filesize
120KB

Download
memory/5004-36-0x0000000004C00000-0x0000000004C10000-memory.dmp

Filesize
64KB

Download
memory/5004-21-0x0000000002940000-0x0000000002976000-memory.dmp

Filesize
216KB

Download
memory/5004-38-0x00000000708E0000-0x000000007092C000-memory.dmp

Filesize
304KB

Download
memory/5004-48-0x0000000006590000-0x00000000065AE000-memory.dmp

Filesize
120KB

Download
memory/5004-49-0x0000000007930000-0x0000000007FAA000-memory.dmp

Filesize
6.5MB

Download
memory/5004-50-0x00000000072E0000-0x00000000072FA000-memory.dmp

Filesize
104KB

Download
memory/5004-51-0x0000000007360000-0x000000000736A000-memory.dmp

Filesize
40KB

Download
memory/5004-52-0x0000000007560000-0x00000000075F6000-memory.dmp

Filesize
600KB

Download
memory/5004-53-0x0000000007530000-0x000000000753E000-memory.dmp

Filesize
56KB

Download
memory/5004-54-0x0000000007640000-0x000000000765A000-memory.dmp

Filesize
104KB

Download
memory/5004-55-0x0000000007620000-0x0000000007628000-memory.dmp

Filesize
32KB

Download
memory/5004-58-0x0000000074A40000-0x00000000751F0000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads