buer | 67c08d2a21a3ade47ed790aa65ef7cbb117e32300b432f5be97d5ff13c745247

General

Target

Document.exe
Size

239KB
MD5

f447d7a2f7cfb24db6b3c42716b16457
SHA1

6c898d8bc1b2311859b34df36e0ba9c392a30b9f
SHA256

67c08d2a21a3ade47ed790aa65ef7cbb117e32300b432f5be97d5ff13c745247
SHA512

b303f0d106ce5fadda89346e78516ca8251dd532f1efa2540085b665d9de6dbba03c77bdc7007294a893f62a5e1fe22790513b97261eb6ba4eed1aac4d870e1a

Score

10^/10

buer loader

Malware Config

Extracted

Family

buer

C2

https://104.248.83.13/

Signatures

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

Buer Loader 2 IoCs

Detects Buer loader in memory or disk.

resource	yara_rule
behavioral2/memory/3068-0-0x0000000000660000-0x000000000066F000-memory.dmp	buer
behavioral2/memory/3068-1-0x0000000040000000-0x000000004000C000-memory.dmp	buer

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

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1508	powershell.exe
1508	powershell.exe
1508	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1508	powershell.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 3068 wrote to memory of 1508	3068	Document.exe	76
PID 3068 wrote to memory of 1508	3068	Document.exe	76
PID 3068 wrote to memory of 1508	3068	Document.exe	76

C:\Users\Admin\AppData\Local\Temp\Document.exe
"C:\Users\Admin\AppData\Local\Temp\Document.exe"
1⤵
- Enumerates connected drives
- Suspicious use of WriteProcessMemory
PID:3068
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\d082df836616ecbce5f8}"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1508

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

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

memory/1508-8-0x0000000007BA0000-0x0000000007BA1000-memory.dmp

Filesize
4KB

Download
memory/1508-26-0x0000000007070000-0x0000000007071000-memory.dmp

Filesize
4KB

Download
memory/1508-9-0x0000000007DF0000-0x0000000007DF1000-memory.dmp

Filesize
4KB

Download
memory/1508-3-0x0000000073BE0000-0x00000000742CE000-memory.dmp

Filesize
6.9MB

Download
memory/1508-4-0x00000000049D0000-0x00000000049D1000-memory.dmp

Filesize
4KB

Download
memory/1508-5-0x0000000007570000-0x0000000007571000-memory.dmp

Filesize
4KB

Download
memory/1508-6-0x0000000007350000-0x0000000007351000-memory.dmp

Filesize
4KB

Download
memory/1508-7-0x00000000074F0000-0x00000000074F1000-memory.dmp

Filesize
4KB

Download
memory/1508-24-0x0000000007080000-0x0000000007081000-memory.dmp

Filesize
4KB

Download
memory/1508-11-0x0000000008220000-0x0000000008221000-memory.dmp

Filesize
4KB

Download
memory/1508-10-0x0000000007CD0000-0x0000000007CD1000-memory.dmp

Filesize
4KB

Download
memory/1508-12-0x00000000085A0000-0x00000000085A1000-memory.dmp

Filesize
4KB

Download
memory/1508-14-0x00000000092A0000-0x00000000092D3000-memory.dmp

Filesize
204KB

Download
memory/1508-21-0x0000000009280000-0x0000000009281000-memory.dmp

Filesize
4KB

Download
memory/1508-22-0x0000000009630000-0x0000000009631000-memory.dmp

Filesize
4KB

Download
memory/1508-23-0x00000000097D0000-0x00000000097D1000-memory.dmp

Filesize
4KB

Download
memory/3068-1-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download
memory/3068-0-0x0000000000660000-0x000000000066F000-memory.dmp

Filesize
60KB

Download

Analysis

Sharing