buer | 35ed64be314538c7a7a019331fe2c4faff7fd55c93f9a9bc5911cd705a60e90a

General

Target

35ed64be314538c7a7a019331fe2c4faff7fd55c93f9a9bc5911cd705a60e90a.exe
Size

168KB
MD5

a69ec18cd982181a5fbd2789663a88bf
SHA1

7d44fdc6938916a54103169d1de0032ddeab0e35
SHA256

35ed64be314538c7a7a019331fe2c4faff7fd55c93f9a9bc5911cd705a60e90a
SHA512

f61baf6748f3c7a5da5e46693274e8d748699199c187a3dbb550747832fcade594f618ffbc5cbba5aa3848ec716ec8f2fb8267c8d2b15e9f63687ad1211f6900

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

C2

https://gstatiknetiplist.cc/

https://gstatiknetiplist.com/

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\USER\S-1-5-21-790309383-526510583-3802439154-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\RedTools\\networker.exe\""	networker.exe

Buer Loader 3 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral1/memory/1708-56-0x0000000000020000-0x000000000002A000-memory.dmp	buer
behavioral1/memory/1708-57-0x0000000040000000-0x000000004049C000-memory.dmp	buer
behavioral1/memory/948-65-0x0000000040000000-0x000000004049C000-memory.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
948	networker.exe

Deletes itself 1 IoCs

pid	Process
948	networker.exe

Loads dropped DLL 2 IoCs

pid	Process
1708	35ed64be314538c7a7a019331fe2c4faff7fd55c93f9a9bc5911cd705a60e90a.exe
1708	35ed64be314538c7a7a019331fe2c4faff7fd55c93f9a9bc5911cd705a60e90a.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)	\??\M:	networker.exe
File opened (read-only)	\??\O:	networker.exe
File opened (read-only)	\??\Z:	networker.exe
File opened (read-only)	\??\B:	networker.exe
File opened (read-only)	\??\H:	networker.exe
File opened (read-only)	\??\I:	networker.exe
File opened (read-only)	\??\L:	networker.exe
File opened (read-only)	\??\W:	networker.exe
File opened (read-only)	\??\X:	networker.exe
File opened (read-only)	\??\Y:	networker.exe
File opened (read-only)	\??\F:	networker.exe
File opened (read-only)	\??\G:	networker.exe
File opened (read-only)	\??\U:	networker.exe
File opened (read-only)	\??\V:	networker.exe
File opened (read-only)	\??\Q:	networker.exe
File opened (read-only)	\??\R:	networker.exe
File opened (read-only)	\??\S:	networker.exe
File opened (read-only)	\??\T:	networker.exe
File opened (read-only)	\??\N:	networker.exe
File opened (read-only)	\??\P:	networker.exe
File opened (read-only)	\??\A:	networker.exe
File opened (read-only)	\??\E:	networker.exe
File opened (read-only)	\??\J:	networker.exe
File opened (read-only)	\??\K:	networker.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1652	1632	WerFault.exe	28

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
948	networker.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 1708 wrote to memory of 948	1708	35ed64be314538c7a7a019331fe2c4faff7fd55c93f9a9bc5911cd705a60e90a.exe	27
PID 1708 wrote to memory of 948	1708	35ed64be314538c7a7a019331fe2c4faff7fd55c93f9a9bc5911cd705a60e90a.exe	27
PID 1708 wrote to memory of 948	1708	35ed64be314538c7a7a019331fe2c4faff7fd55c93f9a9bc5911cd705a60e90a.exe	27
PID 1708 wrote to memory of 948	1708	35ed64be314538c7a7a019331fe2c4faff7fd55c93f9a9bc5911cd705a60e90a.exe	27
PID 948 wrote to memory of 1632	948	networker.exe	28
PID 948 wrote to memory of 1632	948	networker.exe	28
PID 948 wrote to memory of 1632	948	networker.exe	28
PID 948 wrote to memory of 1632	948	networker.exe	28
PID 948 wrote to memory of 1632	948	networker.exe	28
PID 948 wrote to memory of 1632	948	networker.exe	28
PID 948 wrote to memory of 1632	948	networker.exe	28
PID 948 wrote to memory of 1632	948	networker.exe	28
PID 948 wrote to memory of 1632	948	networker.exe	28
PID 948 wrote to memory of 1632	948	networker.exe	28
PID 948 wrote to memory of 1632	948	networker.exe	28
PID 1632 wrote to memory of 1652	1632	secinit.exe	29
PID 1632 wrote to memory of 1652	1632	secinit.exe	29
PID 1632 wrote to memory of 1652	1632	secinit.exe	29
PID 1632 wrote to memory of 1652	1632	secinit.exe	29

C:\Users\Admin\AppData\Local\Temp\35ed64be314538c7a7a019331fe2c4faff7fd55c93f9a9bc5911cd705a60e90a.exe
"C:\Users\Admin\AppData\Local\Temp\35ed64be314538c7a7a019331fe2c4faff7fd55c93f9a9bc5911cd705a60e90a.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1708
- C:\ProgramData\RedTools\networker.exe
  C:\ProgramData\RedTools\networker.exe "C:\Users\Admin\AppData\Local\Temp\35ed64be314538c7a7a019331fe2c4faff7fd55c93f9a9bc5911cd705a60e90a.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Executes dropped EXE
  - Deletes itself
  - Enumerates connected drives
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:948
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\RedTools\networker.exe
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1632
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1632 -s 136
      4⤵
      Program crash
      PID:1652

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

Loading Replay Monitor...

Downloads

C:\ProgramData\RedTools\networker.exe

Filesize
168KB

MD5
a69ec18cd982181a5fbd2789663a88bf

SHA1
7d44fdc6938916a54103169d1de0032ddeab0e35

SHA256
35ed64be314538c7a7a019331fe2c4faff7fd55c93f9a9bc5911cd705a60e90a

SHA512
f61baf6748f3c7a5da5e46693274e8d748699199c187a3dbb550747832fcade594f618ffbc5cbba5aa3848ec716ec8f2fb8267c8d2b15e9f63687ad1211f6900

Download Submit
C:\ProgramData\RedTools\networker.exe

Filesize
168KB

MD5
a69ec18cd982181a5fbd2789663a88bf

SHA1
7d44fdc6938916a54103169d1de0032ddeab0e35

SHA256
35ed64be314538c7a7a019331fe2c4faff7fd55c93f9a9bc5911cd705a60e90a

SHA512
f61baf6748f3c7a5da5e46693274e8d748699199c187a3dbb550747832fcade594f618ffbc5cbba5aa3848ec716ec8f2fb8267c8d2b15e9f63687ad1211f6900

Download Submit
\ProgramData\RedTools\networker.exe

Filesize
168KB

MD5
a69ec18cd982181a5fbd2789663a88bf

SHA1
7d44fdc6938916a54103169d1de0032ddeab0e35

SHA256
35ed64be314538c7a7a019331fe2c4faff7fd55c93f9a9bc5911cd705a60e90a

SHA512
f61baf6748f3c7a5da5e46693274e8d748699199c187a3dbb550747832fcade594f618ffbc5cbba5aa3848ec716ec8f2fb8267c8d2b15e9f63687ad1211f6900

Download Submit
\ProgramData\RedTools\networker.exe

Filesize
168KB

MD5
a69ec18cd982181a5fbd2789663a88bf

SHA1
7d44fdc6938916a54103169d1de0032ddeab0e35

SHA256
35ed64be314538c7a7a019331fe2c4faff7fd55c93f9a9bc5911cd705a60e90a

SHA512
f61baf6748f3c7a5da5e46693274e8d748699199c187a3dbb550747832fcade594f618ffbc5cbba5aa3848ec716ec8f2fb8267c8d2b15e9f63687ad1211f6900

Download Submit
memory/948-65-0x0000000040000000-0x000000004049C000-memory.dmp

Filesize
4.6MB

Download
memory/948-64-0x000000000054A000-0x0000000000551000-memory.dmp

Filesize
28KB

Download
memory/1632-71-0x00000000001D0000-0x000000000066C000-memory.dmp

Filesize
4.6MB

Download
memory/1632-66-0x00000000001D0000-0x000000000066C000-memory.dmp

Filesize
4.6MB

Download
memory/1632-67-0x00000000001D0000-0x000000000066C000-memory.dmp

Filesize
4.6MB

Download
memory/1632-69-0x00000000001D0000-0x000000000066C000-memory.dmp

Filesize
4.6MB

Download
memory/1632-73-0x00000000001D0000-0x000000000066C000-memory.dmp

Filesize
4.6MB

Download
memory/1632-75-0x00000000000C0000-0x00000000000C1000-memory.dmp

Filesize
4KB

Download
memory/1632-78-0x00000000001D0000-0x000000000066C000-memory.dmp

Filesize
4.6MB

Download
memory/1708-55-0x000000000060A000-0x0000000000611000-memory.dmp

Filesize
28KB

Download
memory/1708-56-0x0000000000020000-0x000000000002A000-memory.dmp

Filesize
40KB

Download
memory/1708-54-0x00000000758D1000-0x00000000758D3000-memory.dmp

Filesize
8KB

Download
memory/1708-57-0x0000000040000000-0x000000004049C000-memory.dmp

Filesize
4.6MB

Download

Analysis

Sharing