buer | 1e0fc6cf4d0b655fc2495aeb3890f382e00ec9060ab23fa0a035a5042cda6daa

Analysis

max time kernel
150s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-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\\07ba8bb00089d54f9f49\\gennt.exe\""	gennt.exe

Buer Loader 3 IoCs

Detects Buer loader in memory or disk.

loader

Processes:

resource	yara_rule
behavioral2/memory/4900-0-0x00000000023D0000-0x00000000023DC000-memory.dmp	buer
behavioral2/memory/4900-4-0x00000000023C0000-0x00000000023CA000-memory.dmp	buer
behavioral2/memory/3648-17-0x00000000020D0000-0x00000000020DC000-memory.dmp	buer

Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.

Query Registry
T1012

System Information Discovery
T1082

Processes:

gennt.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-3906287020-2915474608-1755617787-1000\Control Panel\International\Geo\Nation gennt.exe
Deletes itself 1 IoCs

Processes:

gennt.exe

pid process

3648 gennt.exe
Executes dropped EXE 1 IoCs

Processes:

gennt.exe

pid process

3648 gennt.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-3906287020-2915474608-1755617787-1000\Control Panel\International\Geo\Nation	gennt.exe

pid	process
3648	gennt.exe

pid	process
3648	gennt.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)	\??\Z:	gennt.exe
File opened (read-only)	\??\L:	gennt.exe
File opened (read-only)	\??\P:	gennt.exe
File opened (read-only)	\??\X:	gennt.exe
File opened (read-only)	\??\N:	gennt.exe
File opened (read-only)	\??\T:	gennt.exe
File opened (read-only)	\??\V:	gennt.exe
File opened (read-only)	\??\B:	gennt.exe
File opened (read-only)	\??\E:	gennt.exe
File opened (read-only)	\??\M:	gennt.exe
File opened (read-only)	\??\Q:	gennt.exe
File opened (read-only)	\??\R:	gennt.exe
File opened (read-only)	\??\S:	gennt.exe
File opened (read-only)	\??\U:	gennt.exe
File opened (read-only)	\??\Y:	gennt.exe
File opened (read-only)	\??\I:	gennt.exe
File opened (read-only)	\??\J:	gennt.exe
File opened (read-only)	\??\O:	gennt.exe
File opened (read-only)	\??\K:	gennt.exe
File opened (read-only)	\??\W:	gennt.exe
File opened (read-only)	\??\A:	gennt.exe
File opened (read-only)	\??\G:	gennt.exe
File opened (read-only)	\??\H:	gennt.exe

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

System Information Discovery
T1082
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

828 3476 WerFault.exe secinit.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

gennt.exe

pid process

3648 gennt.exe
3648 gennt.exe
Suspicious use of SetWindowsHookEx 4 IoCs

Processes:

345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exegennt.exe

pid process

4900 345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe
4900 345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe
3648 gennt.exe
3648 gennt.exe

pid	pid_target	process	target process
828	3476	WerFault.exe	secinit.exe

pid	process
3648	gennt.exe
3648	gennt.exe

pid	process
4900	345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe
4900	345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe
3648	gennt.exe
3648	gennt.exe

Suspicious use of WriteProcessMemory 16 IoCs

Processes:

345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exegennt.exe

description	pid	process	target process
PID 4900 wrote to memory of 3648	4900	345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe	gennt.exe
PID 4900 wrote to memory of 3648	4900	345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe	gennt.exe
PID 4900 wrote to memory of 3648	4900	345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe	gennt.exe
PID 3648 wrote to memory of 3476	3648	gennt.exe	secinit.exe
PID 3648 wrote to memory of 3476	3648	gennt.exe	secinit.exe
PID 3648 wrote to memory of 3476	3648	gennt.exe	secinit.exe
PID 3648 wrote to memory of 3476	3648	gennt.exe	secinit.exe
PID 3648 wrote to memory of 3476	3648	gennt.exe	secinit.exe
PID 3648 wrote to memory of 3476	3648	gennt.exe	secinit.exe
PID 3648 wrote to memory of 3476	3648	gennt.exe	secinit.exe
PID 3648 wrote to memory of 3476	3648	gennt.exe	secinit.exe
PID 3648 wrote to memory of 3476	3648	gennt.exe	secinit.exe
PID 3648 wrote to memory of 3476	3648	gennt.exe	secinit.exe
PID 3648 wrote to memory of 4636	3648	gennt.exe	cmd.exe
PID 3648 wrote to memory of 4636	3648	gennt.exe	cmd.exe
PID 3648 wrote to memory of 4636	3648	gennt.exe	cmd.exe

C:\Users\Admin\AppData\Local\Temp\345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe"
1⤵
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4900

C:\ProgramData\07ba8bb00089d54f9f49\gennt.exe
C:\ProgramData\07ba8bb00089d54f9f49\gennt.exe "C:\Users\Admin\AppData\Local\Temp\345c37943c7a7e1fd0098aab07fe3c86_JaffaCakes118.exe" ensgJJ
2⤵
- Modifies WinLogon for persistence
- Checks computer location settings
- Deletes itself
- Executes dropped EXE
- Enumerates connected drives
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3648

C:\Windows\SysWOW64\secinit.exe
C:\ProgramData\07ba8bb00089d54f9f49\gennt.exe
3⤵
PID:3476

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 3476 -s 480
4⤵
- Program crash
PID:828

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\07ba8bb00089d54f9f49}"
3⤵
PID:4636

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 376 -p 3476 -ip 3476
1⤵
PID:860

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads

C:\ProgramData\07ba8bb00089d54f9f49\gennt.exe
Filesize
368KB

MD5
345c37943c7a7e1fd0098aab07fe3c86

SHA1
ff8d484c90feab90b94502fbcaff84b16eb9a280

SHA256
1e0fc6cf4d0b655fc2495aeb3890f382e00ec9060ab23fa0a035a5042cda6daa

SHA512
888e8d2f20ccf440107971e8268d06b34aa8c7e5c476f55544321780f30af52c731ada5cca83f015b607f3b61dc5be276199a9dd3cc50fd70ed47c38ca5495cd

Download Submit
memory/3476-25-0x00000000005F0000-0x00000000005F1000-memory.dmp

Filesize
4KB

Download
memory/3648-17-0x00000000020D0000-0x00000000020DC000-memory.dmp

Filesize
48KB

Download
memory/3648-21-0x00000000020B0000-0x00000000020B7000-memory.dmp

Filesize
28KB

Download
memory/3648-27-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/4900-0-0x00000000023D0000-0x00000000023DC000-memory.dmp

Filesize
48KB

Download
memory/4900-4-0x00000000023C0000-0x00000000023CA000-memory.dmp

Filesize
40KB

Download
memory/4900-5-0x00000000023B0000-0x00000000023B7000-memory.dmp

Filesize
28KB

Download