buer | 1e0fc6cf4d0b655fc2495aeb3890f382e00ec9060ab23fa0a035a5042cda6daa

General

Target

1e0fc6cf4d0b655fc2495aeb3890f382e00ec9060ab23fa0a035a5042cda6daa.exe
Size

368KB
MD5

345c37943c7a7e1fd0098aab07fe3c86
SHA1

ff8d484c90feab90b94502fbcaff84b16eb9a280
SHA256

1e0fc6cf4d0b655fc2495aeb3890f382e00ec9060ab23fa0a035a5042cda6daa
SHA512

888e8d2f20ccf440107971e8268d06b34aa8c7e5c476f55544321780f30af52c731ada5cca83f015b607f3b61dc5be276199a9dd3cc50fd70ed47c38ca5495cd

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

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\21a99581b3da5db5e76f\\gennt.exe\""	gennt.exe

Buer Loader 3 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/3836-130-0x00000000023D0000-0x00000000023DC000-memory.dmp	buer
behavioral2/memory/3836-134-0x00000000023C0000-0x00000000023CA000-memory.dmp	buer
behavioral2/memory/4968-138-0x00000000021A0000-0x00000000021AC000-memory.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
4968	gennt.exe

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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Control Panel\International\Geo\Nation	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

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

pid	pid_target	Process	procid_target
5112	4548	WerFault.exe	86

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4968	gennt.exe
4968	gennt.exe

Suspicious use of SetWindowsHookEx 4 IoCs

pid	Process
3836	1e0fc6cf4d0b655fc2495aeb3890f382e00ec9060ab23fa0a035a5042cda6daa.exe
3836	1e0fc6cf4d0b655fc2495aeb3890f382e00ec9060ab23fa0a035a5042cda6daa.exe
4968	gennt.exe
4968	gennt.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 3836 wrote to memory of 4968	3836	1e0fc6cf4d0b655fc2495aeb3890f382e00ec9060ab23fa0a035a5042cda6daa.exe	85
PID 3836 wrote to memory of 4968	3836	1e0fc6cf4d0b655fc2495aeb3890f382e00ec9060ab23fa0a035a5042cda6daa.exe	85
PID 3836 wrote to memory of 4968	3836	1e0fc6cf4d0b655fc2495aeb3890f382e00ec9060ab23fa0a035a5042cda6daa.exe	85
PID 4968 wrote to memory of 4548	4968	gennt.exe	86
PID 4968 wrote to memory of 4548	4968	gennt.exe	86
PID 4968 wrote to memory of 4548	4968	gennt.exe	86
PID 4968 wrote to memory of 4548	4968	gennt.exe	86
PID 4968 wrote to memory of 4548	4968	gennt.exe	86
PID 4968 wrote to memory of 4548	4968	gennt.exe	86
PID 4968 wrote to memory of 4548	4968	gennt.exe	86
PID 4968 wrote to memory of 4548	4968	gennt.exe	86
PID 4968 wrote to memory of 4548	4968	gennt.exe	86
PID 4968 wrote to memory of 4548	4968	gennt.exe	86
PID 4968 wrote to memory of 1540	4968	gennt.exe	90
PID 4968 wrote to memory of 1540	4968	gennt.exe	90
PID 4968 wrote to memory of 1540	4968	gennt.exe	90

C:\Users\Admin\AppData\Local\Temp\1e0fc6cf4d0b655fc2495aeb3890f382e00ec9060ab23fa0a035a5042cda6daa.exe
"C:\Users\Admin\AppData\Local\Temp\1e0fc6cf4d0b655fc2495aeb3890f382e00ec9060ab23fa0a035a5042cda6daa.exe"
1⤵
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3836
- C:\ProgramData\21a99581b3da5db5e76f\gennt.exe
  C:\ProgramData\21a99581b3da5db5e76f\gennt.exe "C:\Users\Admin\AppData\Local\Temp\1e0fc6cf4d0b655fc2495aeb3890f382e00ec9060ab23fa0a035a5042cda6daa.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Executes dropped EXE
  - Checks computer location settings
  - Enumerates connected drives
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4968
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\21a99581b3da5db5e76f\gennt.exe
    3⤵
    PID:4548
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4548 -s 488
      4⤵
      Program crash
      PID:5112
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\21a99581b3da5db5e76f}"
    3⤵
    PID:1540

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 4548 -ip 4548
1⤵
PID:3880

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

1

T1004

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

3

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\21a99581b3da5db5e76f\gennt.exe

Filesize
368KB

MD5
345c37943c7a7e1fd0098aab07fe3c86

SHA1
ff8d484c90feab90b94502fbcaff84b16eb9a280

SHA256
1e0fc6cf4d0b655fc2495aeb3890f382e00ec9060ab23fa0a035a5042cda6daa

SHA512
888e8d2f20ccf440107971e8268d06b34aa8c7e5c476f55544321780f30af52c731ada5cca83f015b607f3b61dc5be276199a9dd3cc50fd70ed47c38ca5495cd

Download Submit
C:\ProgramData\21a99581b3da5db5e76f\gennt.exe

Filesize
368KB

MD5
345c37943c7a7e1fd0098aab07fe3c86

SHA1
ff8d484c90feab90b94502fbcaff84b16eb9a280

SHA256
1e0fc6cf4d0b655fc2495aeb3890f382e00ec9060ab23fa0a035a5042cda6daa

SHA512
888e8d2f20ccf440107971e8268d06b34aa8c7e5c476f55544321780f30af52c731ada5cca83f015b607f3b61dc5be276199a9dd3cc50fd70ed47c38ca5495cd

Download Submit
memory/3836-130-0x00000000023D0000-0x00000000023DC000-memory.dmp

Filesize
48KB

Download
memory/3836-134-0x00000000023C0000-0x00000000023CA000-memory.dmp

Filesize
40KB

Download
memory/4968-138-0x00000000021A0000-0x00000000021AC000-memory.dmp

Filesize
48KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads