buer | 6c7f43434e5db8703c0a47dedeeab976159d8704bfbe2e4ff65405f38d508e9d

General

Target

Print_Document.exe
Size

598KB
MD5

8b44470c7ff69ae671ff6e04550ee15f
SHA1

123f9a7487cd0fdd772f0e7bb19e70d1ee3a32e7
SHA256

6c7f43434e5db8703c0a47dedeeab976159d8704bfbe2e4ff65405f38d508e9d
SHA512

0e03e5895bd406ed61c6e5343e184eb5a86d4ee1b195b35be88fea4fee4508b0a525725ec92971f2c0bc1a929d4dda1f0853bc576071cdefef8adb1a5f45e0de

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/3952-0-0x00000000001F0000-0x00000000001FF000-memory.dmp	buer
behavioral2/memory/3952-1-0x0000000040000000-0x000000004000C000-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)	\??\G:	Print_Document.exe
File opened (read-only)	\??\H:	Print_Document.exe
File opened (read-only)	\??\I:	Print_Document.exe
File opened (read-only)	\??\L:	Print_Document.exe
File opened (read-only)	\??\Q:	Print_Document.exe
File opened (read-only)	\??\R:	Print_Document.exe
File opened (read-only)	\??\P:	Print_Document.exe
File opened (read-only)	\??\U:	Print_Document.exe
File opened (read-only)	\??\W:	Print_Document.exe
File opened (read-only)	\??\Z:	Print_Document.exe
File opened (read-only)	\??\A:	Print_Document.exe
File opened (read-only)	\??\B:	Print_Document.exe
File opened (read-only)	\??\J:	Print_Document.exe
File opened (read-only)	\??\K:	Print_Document.exe
File opened (read-only)	\??\N:	Print_Document.exe
File opened (read-only)	\??\O:	Print_Document.exe
File opened (read-only)	\??\S:	Print_Document.exe
File opened (read-only)	\??\T:	Print_Document.exe
File opened (read-only)	\??\X:	Print_Document.exe
File opened (read-only)	\??\Y:	Print_Document.exe
File opened (read-only)	\??\E:	Print_Document.exe
File opened (read-only)	\??\F:	Print_Document.exe
File opened (read-only)	\??\M:	Print_Document.exe
File opened (read-only)	\??\V:	Print_Document.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2264	powershell.exe
2264	powershell.exe
2264	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2264	powershell.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 3952 wrote to memory of 2264	3952	Print_Document.exe	75
PID 3952 wrote to memory of 2264	3952	Print_Document.exe	75
PID 3952 wrote to memory of 2264	3952	Print_Document.exe	75

C:\Users\Admin\AppData\Local\Temp\Print_Document.exe
"C:\Users\Admin\AppData\Local\Temp\Print_Document.exe"
1⤵
- Enumerates connected drives
- Suspicious use of WriteProcessMemory
PID:3952
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\6080942d5ad3251cee3b}"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2264

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

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Downloads

memory/2264-8-0x0000000006D10000-0x0000000006D11000-memory.dmp

Filesize
4KB

Download
memory/2264-26-0x0000000008F10000-0x0000000008F11000-memory.dmp

Filesize
4KB

Download
memory/2264-9-0x00000000075F0000-0x00000000075F1000-memory.dmp

Filesize
4KB

Download
memory/2264-3-0x0000000073D60000-0x000000007444E000-memory.dmp

Filesize
6.9MB

Download
memory/2264-4-0x0000000000D20000-0x0000000000D21000-memory.dmp

Filesize
4KB

Download
memory/2264-5-0x0000000006EC0000-0x0000000006EC1000-memory.dmp

Filesize
4KB

Download
memory/2264-6-0x0000000006B00000-0x0000000006B01000-memory.dmp

Filesize
4KB

Download
memory/2264-7-0x0000000006CA0000-0x0000000006CA1000-memory.dmp

Filesize
4KB

Download
memory/2264-24-0x0000000008F40000-0x0000000008F41000-memory.dmp

Filesize
4KB

Download
memory/2264-11-0x0000000007D10000-0x0000000007D11000-memory.dmp

Filesize
4KB

Download
memory/2264-10-0x00000000079A0000-0x00000000079A1000-memory.dmp

Filesize
4KB

Download
memory/2264-12-0x0000000007D60000-0x0000000007D61000-memory.dmp

Filesize
4KB

Download
memory/2264-14-0x0000000008C60000-0x0000000008C93000-memory.dmp

Filesize
204KB

Download
memory/2264-21-0x0000000008C40000-0x0000000008C41000-memory.dmp

Filesize
4KB

Download
memory/2264-22-0x0000000008DA0000-0x0000000008DA1000-memory.dmp

Filesize
4KB

Download
memory/2264-23-0x0000000008FE0000-0x0000000008FE1000-memory.dmp

Filesize
4KB

Download
memory/3952-1-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download
memory/3952-0-0x00000000001F0000-0x00000000001FF000-memory.dmp

Filesize
60KB

Download

Analysis

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