buer | 340cdccf8bccec7270e1fe2ca48cb329b8270872fbf1a84c7f55642962dc1acd

General

Target

340cdccf8bccec7270e1fe2ca48cb329b8270872fbf1a84c7f55642962dc1acd.exe
Size

48KB
MD5

76a230f34d4a3a9127ba6006c1260438
SHA1

c52117e45e24a8c3c6ef53286ff29cfcdd12ca85
SHA256

340cdccf8bccec7270e1fe2ca48cb329b8270872fbf1a84c7f55642962dc1acd
SHA512

c1f32f1600558ccf5898a2fb4d8cf2b34d6380e73c31804e667325fb9e6fa6e392b0da61c86228cc00d7a36b4340a10a29b54d355101a9c95946d31445d63d8b

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

C2

https://restaurantfutureworld.net/

https://snowhotdogletter.net/

Signatures

Buer
Buer is a new modular loader first seen in August 2019.
loader buer

Modifies WinLogon for persistence 2 TTPs 2 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\\108d6786562a3ba74b72\\AutoReg.exe\""	AutoReg.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\108d6786562a3ba74b72\\AutoReg.exe\""	secinit.exe

Buer Loader 5 IoCs

Detects Buer loader in memory or disk.

resource	yara_rule
behavioral1/files/0x00040000000130ca-0.dat	buer
behavioral1/files/0x00040000000130ca-1.dat	buer
behavioral1/files/0x00040000000130ca-3.dat	buer
behavioral1/files/0x00040000000130ca-4.dat	buer
behavioral1/memory/2040-6-0x0000000000000000-mapping.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
1436	AutoReg.exe

Deletes itself 1 IoCs

pid	Process
1436	AutoReg.exe

Loads dropped DLL 2 IoCs

pid	Process
1080	340cdccf8bccec7270e1fe2ca48cb329b8270872fbf1a84c7f55642962dc1acd.exe
1080	340cdccf8bccec7270e1fe2ca48cb329b8270872fbf1a84c7f55642962dc1acd.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)	\??\L:	secinit.exe
File opened (read-only)	\??\R:	secinit.exe
File opened (read-only)	\??\A:	secinit.exe
File opened (read-only)	\??\B:	secinit.exe
File opened (read-only)	\??\G:	secinit.exe
File opened (read-only)	\??\N:	secinit.exe
File opened (read-only)	\??\T:	secinit.exe
File opened (read-only)	\??\W:	secinit.exe
File opened (read-only)	\??\H:	secinit.exe
File opened (read-only)	\??\I:	secinit.exe
File opened (read-only)	\??\K:	secinit.exe
File opened (read-only)	\??\S:	secinit.exe
File opened (read-only)	\??\Y:	secinit.exe
File opened (read-only)	\??\Z:	secinit.exe
File opened (read-only)	\??\F:	secinit.exe
File opened (read-only)	\??\O:	secinit.exe
File opened (read-only)	\??\P:	secinit.exe
File opened (read-only)	\??\Q:	secinit.exe
File opened (read-only)	\??\U:	secinit.exe
File opened (read-only)	\??\V:	secinit.exe
File opened (read-only)	\??\X:	secinit.exe
File opened (read-only)	\??\E:	secinit.exe
File opened (read-only)	\??\J:	secinit.exe
File opened (read-only)	\??\M:	secinit.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2044	powershell.exe
2044	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2044	powershell.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 1080 wrote to memory of 1436	1080	340cdccf8bccec7270e1fe2ca48cb329b8270872fbf1a84c7f55642962dc1acd.exe	25
PID 1080 wrote to memory of 1436	1080	340cdccf8bccec7270e1fe2ca48cb329b8270872fbf1a84c7f55642962dc1acd.exe	25
PID 1080 wrote to memory of 1436	1080	340cdccf8bccec7270e1fe2ca48cb329b8270872fbf1a84c7f55642962dc1acd.exe	25
PID 1080 wrote to memory of 1436	1080	340cdccf8bccec7270e1fe2ca48cb329b8270872fbf1a84c7f55642962dc1acd.exe	25
PID 1436 wrote to memory of 2040	1436	AutoReg.exe	26
PID 1436 wrote to memory of 2040	1436	AutoReg.exe	26
PID 1436 wrote to memory of 2040	1436	AutoReg.exe	26
PID 1436 wrote to memory of 2040	1436	AutoReg.exe	26
PID 1436 wrote to memory of 2040	1436	AutoReg.exe	26
PID 1436 wrote to memory of 2040	1436	AutoReg.exe	26
PID 1436 wrote to memory of 2040	1436	AutoReg.exe	26
PID 1436 wrote to memory of 2040	1436	AutoReg.exe	26
PID 1436 wrote to memory of 2040	1436	AutoReg.exe	26
PID 1436 wrote to memory of 2040	1436	AutoReg.exe	26
PID 1436 wrote to memory of 2040	1436	AutoReg.exe	26
PID 2040 wrote to memory of 2044	2040	secinit.exe	27
PID 2040 wrote to memory of 2044	2040	secinit.exe	27
PID 2040 wrote to memory of 2044	2040	secinit.exe	27
PID 2040 wrote to memory of 2044	2040	secinit.exe	27

C:\Users\Admin\AppData\Local\Temp\340cdccf8bccec7270e1fe2ca48cb329b8270872fbf1a84c7f55642962dc1acd.exe
"C:\Users\Admin\AppData\Local\Temp\340cdccf8bccec7270e1fe2ca48cb329b8270872fbf1a84c7f55642962dc1acd.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1080
- C:\ProgramData\108d6786562a3ba74b72\AutoReg.exe
  C:\ProgramData\108d6786562a3ba74b72\AutoReg.exe "C:\Users\Admin\AppData\Local\Temp\340cdccf8bccec7270e1fe2ca48cb329b8270872fbf1a84c7f55642962dc1acd.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Executes dropped EXE
  - Deletes itself
  - Suspicious use of WriteProcessMemory
  PID:1436
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\108d6786562a3ba74b72\AutoReg.exe
    3⤵
    - Modifies WinLogon for persistence
    - Enumerates connected drives
    - Suspicious use of WriteProcessMemory
    PID:2040
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\108d6786562a3ba74b72}"
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2044

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

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2040-5-0x0000000000090000-0x0000000000091000-memory.dmp

Filesize
4KB

Download
memory/2044-10-0x0000000004790000-0x0000000004791000-memory.dmp

Filesize
4KB

Download
memory/2044-8-0x0000000074140000-0x000000007482E000-memory.dmp

Filesize
6.9MB

Download
memory/2044-9-0x0000000002110000-0x0000000002111000-memory.dmp

Filesize
4KB

Download
memory/2044-11-0x0000000002520000-0x0000000002521000-memory.dmp

Filesize
4KB

Download
memory/2044-12-0x0000000005240000-0x0000000005241000-memory.dmp

Filesize
4KB

Download
memory/2044-15-0x0000000005620000-0x0000000005621000-memory.dmp

Filesize
4KB

Download
memory/2044-20-0x0000000005700000-0x0000000005701000-memory.dmp

Filesize
4KB

Download
memory/2044-21-0x0000000005750000-0x0000000005751000-memory.dmp

Filesize
4KB

Download
memory/2044-28-0x0000000006240000-0x0000000006241000-memory.dmp

Filesize
4KB

Download
memory/2044-29-0x00000000055D0000-0x00000000055D1000-memory.dmp

Filesize
4KB

Download
memory/2044-43-0x0000000006300000-0x0000000006301000-memory.dmp

Filesize
4KB

Download
memory/2044-44-0x0000000006310000-0x0000000006311000-memory.dmp

Filesize
4KB

Download

Analysis

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