buer | 1e0fc6cf4d0b655fc2495aeb3890f382e00ec9060ab23fa0a035a5042cda6daa

Analysis

max time kernel
143s
max time network
124s
platform
windows7_x64
resource
win7-20240508-en
resource tags

arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system
submitted
11-05-2024 11:27

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General

Target

345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe
Size

368KB
MD5

345c37943c7a7e1fd0098aab07fe3c86
SHA1

ff8d484c90feab90b94502fbcaff84b16eb9a280
SHA256

1e0fc6cf4d0b655fc2495aeb3890f382e00ec9060ab23fa0a035a5042cda6daa
SHA512

888e8d2f20ccf440107971e8268d06b34aa8c7e5c476f55544321780f30af52c731ada5cca83f015b607f3b61dc5be276199a9dd3cc50fd70ed47c38ca5495cd
SSDEEP

6144:GpWnsT313ntnJiuPn28TTc48OSswYLi9zdsPqw73hJfrhIN:+3Xnguf2ic/swVzWBJT4

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

https://162.244.81.87/

http://162.244.81.87:8080/

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

Processes:

gennt.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\78b520f602ee2ea4114d\\gennt.exe\""	gennt.exe

Buer Loader 3 IoCs

Detects Buer loader in memory or disk.

loader

Processes:

resource	yara_rule
behavioral1/memory/1796-0-0x0000000000290000-0x000000000029C000-memory.dmp	buer
behavioral1/memory/1796-4-0x0000000000280000-0x000000000028A000-memory.dmp	buer
behavioral1/memory/2564-14-0x00000000002E0000-0x00000000002EC000-memory.dmp	buer

Deletes itself 1 IoCs

Processes:

gennt.exe

pid process

2564 gennt.exe
Executes dropped EXE 1 IoCs

Processes:

gennt.exe

pid process

2564 gennt.exe
Loads dropped DLL 2 IoCs

Processes:

345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe

pid process

1796 345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe
1796 345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe

pid	process
2564	gennt.exe

pid	process
2564	gennt.exe

pid	process
1796	345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe
1796	345c37943c7a7e1fd0098aab07fe3c86_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

Processes:

gennt.exe

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

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

gennt.exe

pid process

2564 gennt.exe
Suspicious use of SetWindowsHookEx 4 IoCs

Processes:

345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exegennt.exe

pid process

1796 345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe
1796 345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe
2564 gennt.exe
2564 gennt.exe

pid	process
2564	gennt.exe

pid	process
1796	345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe
1796	345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe
2564	gennt.exe
2564	gennt.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exegennt.exe

description	pid	process	target process
PID 1796 wrote to memory of 2564	1796	345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe	gennt.exe
PID 1796 wrote to memory of 2564	1796	345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe	gennt.exe
PID 1796 wrote to memory of 2564	1796	345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe	gennt.exe
PID 1796 wrote to memory of 2564	1796	345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe	gennt.exe
PID 2564 wrote to memory of 3020	2564	gennt.exe	secinit.exe
PID 2564 wrote to memory of 3020	2564	gennt.exe	secinit.exe
PID 2564 wrote to memory of 3020	2564	gennt.exe	secinit.exe
PID 2564 wrote to memory of 3020	2564	gennt.exe	secinit.exe
PID 2564 wrote to memory of 1628	2564	gennt.exe	cmd.exe
PID 2564 wrote to memory of 1628	2564	gennt.exe	cmd.exe
PID 2564 wrote to memory of 1628	2564	gennt.exe	cmd.exe
PID 2564 wrote to memory of 1628	2564	gennt.exe	cmd.exe

C:\Users\Admin\AppData\Local\Temp\345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1796

C:\ProgramData\78b520f602ee2ea4114d\gennt.exe
C:\ProgramData\78b520f602ee2ea4114d\gennt.exe "C:\Users\Admin\AppData\Local\Temp\345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe" ensgJJ
2⤵
- Modifies WinLogon for persistence
- Deletes itself
- Executes dropped EXE
- Enumerates connected drives
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2564

C:\Windows\SysWOW64\secinit.exe
C:\ProgramData\78b520f602ee2ea4114d\gennt.exe
3⤵
PID:3020

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\78b520f602ee2ea4114d}"
3⤵
PID:1628

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads

\ProgramData\78b520f602ee2ea4114d\gennt.exe
Filesize
368KB

MD5
345c37943c7a7e1fd0098aab07fe3c86

SHA1
ff8d484c90feab90b94502fbcaff84b16eb9a280

SHA256
1e0fc6cf4d0b655fc2495aeb3890f382e00ec9060ab23fa0a035a5042cda6daa

SHA512
888e8d2f20ccf440107971e8268d06b34aa8c7e5c476f55544321780f30af52c731ada5cca83f015b607f3b61dc5be276199a9dd3cc50fd70ed47c38ca5495cd

Download Submit
memory/1796-0-0x0000000000290000-0x000000000029C000-memory.dmp

Filesize
48KB

Download
memory/1796-4-0x0000000000280000-0x000000000028A000-memory.dmp

Filesize
40KB

Download
memory/2564-14-0x00000000002E0000-0x00000000002EC000-memory.dmp

Filesize
48KB

Download
memory/2564-18-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download