buer | 6c870d3a5abad32d70b0599de0715e146228141243ac81066b99d77a9d315ce1

General

Target

e212e5bc428a0bca4615205f07c10d4e57dc881a2f32a9b8aeec040169435aa1.exe

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

C2

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

T1004

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\\19aedf2a284d49ff442c\\gennt.exe\""	gennt.exe

Buer Loader 1 IoCs

Detects Buer loader in memory or disk.

Processes:

resource	yara_rule
behavioral2/memory/2460-0-0x00000000001D0000-0x00000000001DC000-memory.dmp	buer

Executes dropped EXE 1 IoCs

Processes:

gennt.exe

pid process

3820 gennt.exe
Deletes itself 1 IoCs

Processes:

gennt.exe

pid process

3820 gennt.exe

pid	process
3820	gennt.exe

pid	process
3820	gennt.exe

Enumerates connected drives 3 TTPs 24 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)	\??\K:	gennt.exe
File opened (read-only)	\??\V:	gennt.exe
File opened (read-only)	\??\X:	gennt.exe
File opened (read-only)	\??\Z:	gennt.exe
File opened (read-only)	\??\E:	gennt.exe
File opened (read-only)	\??\H:	gennt.exe
File opened (read-only)	\??\J:	gennt.exe
File opened (read-only)	\??\L:	gennt.exe
File opened (read-only)	\??\M:	gennt.exe
File opened (read-only)	\??\N:	gennt.exe
File opened (read-only)	\??\Q:	gennt.exe
File opened (read-only)	\??\A:	gennt.exe
File opened (read-only)	\??\B:	gennt.exe
File opened (read-only)	\??\I:	gennt.exe
File opened (read-only)	\??\O:	gennt.exe
File opened (read-only)	\??\P:	gennt.exe
File opened (read-only)	\??\T:	gennt.exe
File opened (read-only)	\??\W:	gennt.exe
File opened (read-only)	\??\F:	gennt.exe
File opened (read-only)	\??\G:	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

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

System Information Discovery
T1082
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

804 3768 WerFault.exe secinit.exe

pid	pid_target	process	target process
804	3768	WerFault.exe	secinit.exe

Suspicious behavior: EnumeratesProcesses 15 IoCs

Processes:

WerFault.exegennt.exe

pid	process
804	WerFault.exe
804	WerFault.exe
804	WerFault.exe
804	WerFault.exe
804	WerFault.exe
804	WerFault.exe
804	WerFault.exe
804	WerFault.exe
804	WerFault.exe
804	WerFault.exe
804	WerFault.exe
804	WerFault.exe
804	WerFault.exe
3820	gennt.exe
3820	gennt.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

WerFault.exe

description pid process

Token: SeRestorePrivilege 804 WerFault.exe
Token: SeBackupPrivilege 804 WerFault.exe
Token: SeDebugPrivilege 804 WerFault.exe

description	pid	process
Token: SeRestorePrivilege	804	WerFault.exe
Token: SeBackupPrivilege	804	WerFault.exe
Token: SeDebugPrivilege	804	WerFault.exe

Suspicious use of WriteProcessMemory 16 IoCs

Processes:

e212e5bc428a0bca4615205f07c10d4e57dc881a2f32a9b8aeec040169435aa1.exegennt.exe

description	pid	process	target process
PID 2460 wrote to memory of 3820	2460	e212e5bc428a0bca4615205f07c10d4e57dc881a2f32a9b8aeec040169435aa1.exe	gennt.exe
PID 2460 wrote to memory of 3820	2460	e212e5bc428a0bca4615205f07c10d4e57dc881a2f32a9b8aeec040169435aa1.exe	gennt.exe
PID 2460 wrote to memory of 3820	2460	e212e5bc428a0bca4615205f07c10d4e57dc881a2f32a9b8aeec040169435aa1.exe	gennt.exe
PID 3820 wrote to memory of 3768	3820	gennt.exe	secinit.exe
PID 3820 wrote to memory of 3768	3820	gennt.exe	secinit.exe
PID 3820 wrote to memory of 3768	3820	gennt.exe	secinit.exe
PID 3820 wrote to memory of 3768	3820	gennt.exe	secinit.exe
PID 3820 wrote to memory of 3768	3820	gennt.exe	secinit.exe
PID 3820 wrote to memory of 3768	3820	gennt.exe	secinit.exe
PID 3820 wrote to memory of 3768	3820	gennt.exe	secinit.exe
PID 3820 wrote to memory of 3768	3820	gennt.exe	secinit.exe
PID 3820 wrote to memory of 3768	3820	gennt.exe	secinit.exe
PID 3820 wrote to memory of 3768	3820	gennt.exe	secinit.exe
PID 3820 wrote to memory of 1188	3820	gennt.exe	cmd.exe
PID 3820 wrote to memory of 1188	3820	gennt.exe	cmd.exe
PID 3820 wrote to memory of 1188	3820	gennt.exe	cmd.exe

C:\Users\Admin\AppData\Local\Temp\e212e5bc428a0bca4615205f07c10d4e57dc881a2f32a9b8aeec040169435aa1.exe
"C:\Users\Admin\AppData\Local\Temp\e212e5bc428a0bca4615205f07c10d4e57dc881a2f32a9b8aeec040169435aa1.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2460

C:\ProgramData\19aedf2a284d49ff442c\gennt.exe
C:\ProgramData\19aedf2a284d49ff442c\gennt.exe "C:\Users\Admin\AppData\Local\Temp\e212e5bc428a0bca4615205f07c10d4e57dc881a2f32a9b8aeec040169435aa1.exe" ensgJJ
2⤵
- Modifies WinLogon for persistence
- Executes dropped EXE
- Deletes itself
- Enumerates connected drives
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:3820

C:\Windows\SysWOW64\secinit.exe
C:\ProgramData\19aedf2a284d49ff442c\gennt.exe
3⤵
PID:3768

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 3768 -s 360
4⤵
- Program crash
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:804

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\19aedf2a284d49ff442c}"
3⤵
PID:1188

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

1

T1004

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

Peripheral Device Discovery

1

T1120

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\ProgramData\19aedf2a284d49ff442c\gennt.exe
MD5
db3c2530d727bac602e6c41cb3e60562

SHA1
0d62d5a5fba84c1e826591f27892466a1cd59257

SHA256
e212e5bc428a0bca4615205f07c10d4e57dc881a2f32a9b8aeec040169435aa1

SHA512
03e25d32a262c88ec2cf9303b7835da93b321a1d2a092531c96df8d95065944250f63c075792ca72b6d2a12d60c492782ba516712fbca0bf3b0239477b6b06e8

Download Submit
C:\ProgramData\19aedf2a284d49ff442c\gennt.exe
MD5
db3c2530d727bac602e6c41cb3e60562

SHA1
0d62d5a5fba84c1e826591f27892466a1cd59257

SHA256
e212e5bc428a0bca4615205f07c10d4e57dc881a2f32a9b8aeec040169435aa1

SHA512
03e25d32a262c88ec2cf9303b7835da93b321a1d2a092531c96df8d95065944250f63c075792ca72b6d2a12d60c492782ba516712fbca0bf3b0239477b6b06e8

Download Submit
memory/804-12-0x0000000005780000-0x0000000005781000-memory.dmp

Filesize
4KB

Download
memory/804-6-0x0000000004F20000-0x0000000004F21000-memory.dmp

Filesize
4KB

Download
memory/1188-13-0x0000000000000000-mapping.dmp

Download
memory/2460-0-0x00000000001D0000-0x00000000001DC000-memory.dmp

Filesize
48KB

Download
memory/3768-7-0x0000000000000000-mapping.dmp

Download
memory/3768-8-0x0000000000000000-mapping.dmp

Download
memory/3768-9-0x0000000000000000-mapping.dmp

Download
memory/3768-10-0x0000000000000000-mapping.dmp

Download
memory/3768-11-0x0000000000000000-mapping.dmp

Download
memory/3768-5-0x0000000000000000-mapping.dmp

Download
memory/3820-1-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

Loading Replay Monitor...

Downloads