buer | 94ba896b284005a58298806bba47f725cdcaa1816b3c79226639cb145bf16886

General

Target

96878fda61a76395aafa16a6150b0fe1_JaffaCakes118.exe
Size

709KB
MD5

96878fda61a76395aafa16a6150b0fe1
SHA1

3509a916a873351ab23bc671cce5ca9aa3299e62
SHA256

94ba896b284005a58298806bba47f725cdcaa1816b3c79226639cb145bf16886
SHA512

4e98e7b32441d270496b35c13e16ca0fedfca10e8baf8cb92a0a54fc803fb2bbfbc3417fe22467c195655821167d068a0ccde3310b45c75cada677ccea638234
SSDEEP

12288:skkB0IBUT4cicLtJAXqL2+uiN9mTqFcsTmjuHQdCgfRm:hkB0IB64cicLtJAXqL6qFrooQ+

Score

10^/10

buer execution loader persistence

Malware Config

Extracted

Family

buer

C2

https://165.22.76.41/

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\\deb61ad9f17d372c13ec\\gennt.exe\""	gennt.exe

Buer Loader 3 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral1/memory/2064-4-0x0000000040000000-0x000000004000C000-memory.dmp	buer
behavioral1/memory/2064-0-0x0000000000340000-0x000000000034F000-memory.dmp	buer
behavioral1/memory/2064-8-0x0000000000020000-0x000000000002D000-memory.dmp	buer

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
2024	powershell.exe

Deletes itself 1 IoCs

pid	Process
2676	gennt.exe

Executes dropped EXE 1 IoCs

pid	Process
2676	gennt.exe

Loads dropped DLL 2 IoCs

pid	Process
2064	96878fda61a76395aafa16a6150b0fe1_JaffaCakes118.exe
2064	96878fda61a76395aafa16a6150b0fe1_JaffaCakes118.exe

Enumerates connected drives 3 TTPs 23 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\K:	gennt.exe
File opened (read-only)	\??\M:	gennt.exe
File opened (read-only)	\??\R:	gennt.exe
File opened (read-only)	\??\U:	gennt.exe
File opened (read-only)	\??\A:	gennt.exe
File opened (read-only)	\??\G:	gennt.exe
File opened (read-only)	\??\Z:	gennt.exe
File opened (read-only)	\??\I:	gennt.exe
File opened (read-only)	\??\Q:	gennt.exe
File opened (read-only)	\??\H:	gennt.exe
File opened (read-only)	\??\N:	gennt.exe
File opened (read-only)	\??\P:	gennt.exe
File opened (read-only)	\??\S:	gennt.exe
File opened (read-only)	\??\T:	gennt.exe
File opened (read-only)	\??\X:	gennt.exe
File opened (read-only)	\??\B:	gennt.exe
File opened (read-only)	\??\E:	gennt.exe
File opened (read-only)	\??\O:	gennt.exe
File opened (read-only)	\??\V:	gennt.exe
File opened (read-only)	\??\W:	gennt.exe
File opened (read-only)	\??\Y:	gennt.exe
File opened (read-only)	\??\J:	gennt.exe
File opened (read-only)	\??\L:	gennt.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2024	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2024	powershell.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 2064 wrote to memory of 2676	2064	96878fda61a76395aafa16a6150b0fe1_JaffaCakes118.exe	31
PID 2064 wrote to memory of 2676	2064	96878fda61a76395aafa16a6150b0fe1_JaffaCakes118.exe	31
PID 2064 wrote to memory of 2676	2064	96878fda61a76395aafa16a6150b0fe1_JaffaCakes118.exe	31
PID 2064 wrote to memory of 2676	2064	96878fda61a76395aafa16a6150b0fe1_JaffaCakes118.exe	31
PID 2676 wrote to memory of 2024	2676	gennt.exe	33
PID 2676 wrote to memory of 2024	2676	gennt.exe	33
PID 2676 wrote to memory of 2024	2676	gennt.exe	33
PID 2676 wrote to memory of 2024	2676	gennt.exe	33

C:\Users\Admin\AppData\Local\Temp\96878fda61a76395aafa16a6150b0fe1_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\96878fda61a76395aafa16a6150b0fe1_JaffaCakes118.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:2064
- C:\ProgramData\deb61ad9f17d372c13ec\gennt.exe
  C:\ProgramData\deb61ad9f17d372c13ec\gennt.exe "C:\Users\Admin\AppData\Local\Temp\96878fda61a76395aafa16a6150b0fe1_JaffaCakes118.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Deletes itself
  - Executes dropped EXE
  - Enumerates connected drives
  - Suspicious use of WriteProcessMemory
  PID:2676
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\deb61ad9f17d372c13ec}"
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2024

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

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

Peripheral Device Discovery

Query Registry

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\deb61ad9f17d372c13ec\gennt.exe

Filesize
709KB

MD5
96878fda61a76395aafa16a6150b0fe1

SHA1
3509a916a873351ab23bc671cce5ca9aa3299e62

SHA256
94ba896b284005a58298806bba47f725cdcaa1816b3c79226639cb145bf16886

SHA512
4e98e7b32441d270496b35c13e16ca0fedfca10e8baf8cb92a0a54fc803fb2bbfbc3417fe22467c195655821167d068a0ccde3310b45c75cada677ccea638234

Download Submit
memory/2024-33-0x0000000074160000-0x000000007470B000-memory.dmp

Filesize
5.7MB

Download
memory/2024-36-0x0000000074160000-0x000000007470B000-memory.dmp

Filesize
5.7MB

Download
memory/2024-37-0x0000000074160000-0x000000007470B000-memory.dmp

Filesize
5.7MB

Download
memory/2024-35-0x0000000074160000-0x000000007470B000-memory.dmp

Filesize
5.7MB

Download
memory/2024-34-0x0000000074160000-0x000000007470B000-memory.dmp

Filesize
5.7MB

Download
memory/2024-32-0x0000000074161000-0x0000000074162000-memory.dmp

Filesize
4KB

Download
memory/2064-0-0x0000000000340000-0x000000000034F000-memory.dmp

Filesize
60KB

Download
memory/2064-4-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download
memory/2064-20-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download
memory/2064-8-0x0000000000020000-0x000000000002D000-memory.dmp

Filesize
52KB

Download
memory/2064-9-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download
memory/2064-7-0x0000000000330000-0x0000000000331000-memory.dmp

Filesize
4KB

Download
memory/2676-31-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download
memory/2676-44-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads