buer | 45763478ad7f43aa83ebaaea28bafaac6835bec45bf8c6948cf5dd454b6e30c7

General

Target

45763478ad7f43aa83ebaaea28bafaac6835bec45bf8c6948cf5dd454b6e30c7.exe
Size

96KB
MD5

47c011a8f2bab4077182cff452c36608
SHA1

edbeed7e8b4f56502bd600d8770e786936e8e8d0
SHA256

45763478ad7f43aa83ebaaea28bafaac6835bec45bf8c6948cf5dd454b6e30c7
SHA512

2531647ab6aebf1c7d714225f3a724b875852ff9cf461eeb6be27ea6d7251f332edc2b2b1ce6907c6fa2f00a0e83c3f7ea27ea02f5c824f0dcd6efb313aa2e01

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\\8b92c1076888f9d43426\\gennt.exe\""	gennt.exe

Buer Loader 2 IoCs

Detects Buer loader in memory or disk.

resource	yara_rule
behavioral1/memory/1112-60-0x0000000000260000-0x000000000026C000-memory.dmp	buer
behavioral1/memory/1368-62-0x0000000000250000-0x000000000025C000-memory.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
1368	gennt.exe

Deletes itself 1 IoCs

pid	Process
1368	gennt.exe

Loads dropped DLL 2 IoCs

pid	Process
1112	45763478ad7f43aa83ebaaea28bafaac6835bec45bf8c6948cf5dd454b6e30c7.exe
1112	45763478ad7f43aa83ebaaea28bafaac6835bec45bf8c6948cf5dd454b6e30c7.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)	\??\O:	gennt.exe
File opened (read-only)	\??\S:	gennt.exe
File opened (read-only)	\??\T:	gennt.exe
File opened (read-only)	\??\A:	gennt.exe
File opened (read-only)	\??\B:	gennt.exe
File opened (read-only)	\??\E:	gennt.exe
File opened (read-only)	\??\G:	gennt.exe
File opened (read-only)	\??\X:	gennt.exe
File opened (read-only)	\??\Z:	gennt.exe
File opened (read-only)	\??\H:	gennt.exe
File opened (read-only)	\??\K:	gennt.exe
File opened (read-only)	\??\M:	gennt.exe
File opened (read-only)	\??\P:	gennt.exe
File opened (read-only)	\??\Y:	gennt.exe
File opened (read-only)	\??\F:	gennt.exe
File opened (read-only)	\??\I:	gennt.exe
File opened (read-only)	\??\L:	gennt.exe
File opened (read-only)	\??\W:	gennt.exe
File opened (read-only)	\??\U:	gennt.exe
File opened (read-only)	\??\V:	gennt.exe
File opened (read-only)	\??\J:	gennt.exe
File opened (read-only)	\??\N:	gennt.exe
File opened (read-only)	\??\Q:	gennt.exe
File opened (read-only)	\??\R:	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
1368	gennt.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 1112 wrote to memory of 1368	1112	45763478ad7f43aa83ebaaea28bafaac6835bec45bf8c6948cf5dd454b6e30c7.exe	29
PID 1112 wrote to memory of 1368	1112	45763478ad7f43aa83ebaaea28bafaac6835bec45bf8c6948cf5dd454b6e30c7.exe	29
PID 1112 wrote to memory of 1368	1112	45763478ad7f43aa83ebaaea28bafaac6835bec45bf8c6948cf5dd454b6e30c7.exe	29
PID 1112 wrote to memory of 1368	1112	45763478ad7f43aa83ebaaea28bafaac6835bec45bf8c6948cf5dd454b6e30c7.exe	29
PID 1368 wrote to memory of 1116	1368	gennt.exe	30
PID 1368 wrote to memory of 1116	1368	gennt.exe	30
PID 1368 wrote to memory of 1116	1368	gennt.exe	30
PID 1368 wrote to memory of 1116	1368	gennt.exe	30
PID 1368 wrote to memory of 1200	1368	gennt.exe	31
PID 1368 wrote to memory of 1200	1368	gennt.exe	31
PID 1368 wrote to memory of 1200	1368	gennt.exe	31
PID 1368 wrote to memory of 1200	1368	gennt.exe	31

C:\Users\Admin\AppData\Local\Temp\45763478ad7f43aa83ebaaea28bafaac6835bec45bf8c6948cf5dd454b6e30c7.exe
"C:\Users\Admin\AppData\Local\Temp\45763478ad7f43aa83ebaaea28bafaac6835bec45bf8c6948cf5dd454b6e30c7.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1112
- C:\ProgramData\8b92c1076888f9d43426\gennt.exe
  C:\ProgramData\8b92c1076888f9d43426\gennt.exe "C:\Users\Admin\AppData\Local\Temp\45763478ad7f43aa83ebaaea28bafaac6835bec45bf8c6948cf5dd454b6e30c7.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Executes dropped EXE
  - Deletes itself
  - Enumerates connected drives
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:1368
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\8b92c1076888f9d43426\gennt.exe
    3⤵
    PID:1116
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\8b92c1076888f9d43426}"
    3⤵
    PID:1200

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/1112-54-0x0000000075F21000-0x0000000075F23000-memory.dmp

Filesize
8KB

Download
memory/1112-59-0x0000000000400000-0x0000000000427000-memory.dmp

Filesize
156KB

Download
memory/1112-60-0x0000000000260000-0x000000000026C000-memory.dmp

Filesize
48KB

Download
memory/1368-61-0x0000000000220000-0x0000000000221000-memory.dmp

Filesize
4KB

Download
memory/1368-62-0x0000000000250000-0x000000000025C000-memory.dmp

Filesize
48KB

Download
memory/1368-64-0x0000000000400000-0x0000000000427000-memory.dmp

Filesize
156KB

Download

Analysis

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