buer | b95fe75736d19887ae4e3516c5cd9c7fa7caf763a138794f9aaecdee8d37f0b0

General

Target

b95fe75736d19887ae4e3516c5cd9c7fa7caf763a138794f9aaecdee8d37f0b0.exe
Size

207KB
MD5

dd5ecbbdd7c8ca66d7b3f8d524855e9c
SHA1

2d46c394a5c4722e7fccfd3bc92636b5a0b6fbec
SHA256

b95fe75736d19887ae4e3516c5cd9c7fa7caf763a138794f9aaecdee8d37f0b0
SHA512

964d717a45c287d9b7e06d6bd21272021071f8fdfb835f5c79f2b422b3e3035bc37722a5fcb4ae830bb9a9eeea656fa0cf734de87c60da89fd5593265470eb8e

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

C2

https://mesoplano.com/

https://banusle.top/

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\\2fad3ebd5b830f1d2237\\gennt.exe\""	gennt.exe

Buer Loader 3 IoCs

Detects Buer loader in memory or disk.

resource	yara_rule
behavioral1/memory/1864-59-0x0000000000290000-0x000000000029C000-memory.dmp	buer
behavioral1/memory/652-72-0x00000000001E0000-0x00000000001EC000-memory.dmp	buer
behavioral1/memory/1736-77-0x0000000000240000-0x000000000024C000-memory.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
652	gennt.exe

Deletes itself 1 IoCs

pid	Process
652	gennt.exe

Loads dropped DLL 2 IoCs

pid	Process
1864	b95fe75736d19887ae4e3516c5cd9c7fa7caf763a138794f9aaecdee8d37f0b0.exe
1864	b95fe75736d19887ae4e3516c5cd9c7fa7caf763a138794f9aaecdee8d37f0b0.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)	\??\U:	gennt.exe
File opened (read-only)	\??\V:	gennt.exe
File opened (read-only)	\??\A:	gennt.exe
File opened (read-only)	\??\B:	gennt.exe
File opened (read-only)	\??\F:	gennt.exe
File opened (read-only)	\??\K:	gennt.exe
File opened (read-only)	\??\L:	gennt.exe
File opened (read-only)	\??\T:	gennt.exe
File opened (read-only)	\??\H:	gennt.exe
File opened (read-only)	\??\M:	gennt.exe
File opened (read-only)	\??\N:	gennt.exe
File opened (read-only)	\??\W:	gennt.exe
File opened (read-only)	\??\X:	gennt.exe
File opened (read-only)	\??\I:	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)	\??\Z:	gennt.exe
File opened (read-only)	\??\E:	gennt.exe
File opened (read-only)	\??\G:	gennt.exe
File opened (read-only)	\??\J:	gennt.exe
File opened (read-only)	\??\P:	gennt.exe
File opened (read-only)	\??\S:	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

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
652	gennt.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 1864 wrote to memory of 652	1864	b95fe75736d19887ae4e3516c5cd9c7fa7caf763a138794f9aaecdee8d37f0b0.exe	27
PID 1864 wrote to memory of 652	1864	b95fe75736d19887ae4e3516c5cd9c7fa7caf763a138794f9aaecdee8d37f0b0.exe	27
PID 1864 wrote to memory of 652	1864	b95fe75736d19887ae4e3516c5cd9c7fa7caf763a138794f9aaecdee8d37f0b0.exe	27
PID 1864 wrote to memory of 652	1864	b95fe75736d19887ae4e3516c5cd9c7fa7caf763a138794f9aaecdee8d37f0b0.exe	27
PID 652 wrote to memory of 1736	652	gennt.exe	28
PID 652 wrote to memory of 1736	652	gennt.exe	28
PID 652 wrote to memory of 1736	652	gennt.exe	28
PID 652 wrote to memory of 1736	652	gennt.exe	28
PID 652 wrote to memory of 1736	652	gennt.exe	28
PID 652 wrote to memory of 1736	652	gennt.exe	28
PID 652 wrote to memory of 1736	652	gennt.exe	28
PID 652 wrote to memory of 1736	652	gennt.exe	28
PID 652 wrote to memory of 1736	652	gennt.exe	28
PID 652 wrote to memory of 1736	652	gennt.exe	28
PID 652 wrote to memory of 1432	652	gennt.exe	31
PID 652 wrote to memory of 1432	652	gennt.exe	31
PID 652 wrote to memory of 1432	652	gennt.exe	31
PID 652 wrote to memory of 1432	652	gennt.exe	31

C:\Users\Admin\AppData\Local\Temp\b95fe75736d19887ae4e3516c5cd9c7fa7caf763a138794f9aaecdee8d37f0b0.exe
"C:\Users\Admin\AppData\Local\Temp\b95fe75736d19887ae4e3516c5cd9c7fa7caf763a138794f9aaecdee8d37f0b0.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1864
- C:\ProgramData\2fad3ebd5b830f1d2237\gennt.exe
  C:\ProgramData\2fad3ebd5b830f1d2237\gennt.exe "C:\Users\Admin\AppData\Local\Temp\b95fe75736d19887ae4e3516c5cd9c7fa7caf763a138794f9aaecdee8d37f0b0.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Executes dropped EXE
  - Deletes itself
  - Enumerates connected drives
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:652
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\2fad3ebd5b830f1d2237\gennt.exe
    3⤵
    PID:1736
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\2fad3ebd5b830f1d2237}"
    3⤵
    PID:1432

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

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/652-72-0x00000000001E0000-0x00000000001EC000-memory.dmp

Filesize
48KB

Download
memory/652-70-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/652-71-0x00000000001B0000-0x00000000001B1000-memory.dmp

Filesize
4KB

Download
memory/1736-66-0x00000000000C0000-0x00000000000C1000-memory.dmp

Filesize
4KB

Download
memory/1736-73-0x00000000000C0000-0x00000000000C1000-memory.dmp

Filesize
4KB

Download
memory/1736-65-0x0000000000080000-0x00000000000B5000-memory.dmp

Filesize
212KB

Download
memory/1736-77-0x0000000000240000-0x000000000024C000-memory.dmp

Filesize
48KB

Download
memory/1736-67-0x00000000000C0000-0x00000000000C1000-memory.dmp

Filesize
4KB

Download
memory/1736-64-0x0000000000080000-0x00000000000B5000-memory.dmp

Filesize
212KB

Download
memory/1736-68-0x0000000000080000-0x00000000000B5000-memory.dmp

Filesize
212KB

Download
memory/1736-62-0x0000000000080000-0x00000000000B5000-memory.dmp

Filesize
212KB

Download
memory/1736-63-0x0000000000080000-0x00000000000B5000-memory.dmp

Filesize
212KB

Download
memory/1736-76-0x0000000000160000-0x0000000000161000-memory.dmp

Filesize
4KB

Download
memory/1736-75-0x0000000000081000-0x00000000000B5000-memory.dmp

Filesize
208KB

Download
memory/1736-74-0x0000000000080000-0x00000000000B5000-memory.dmp

Filesize
212KB

Download
memory/1864-58-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/1864-59-0x0000000000290000-0x000000000029C000-memory.dmp

Filesize
48KB

Download
memory/1864-54-0x0000000076041000-0x0000000076043000-memory.dmp

Filesize
8KB

Download

Analysis

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