buer | 0e735a5773b8aa36e2a596ea6e468d75038db7dd644236b4eb745b66762f4ebf

Analysis

max time kernel
15s
max time network
112s
platform
windows10_x64
resource
win10v20201028
submitted
04-03-2021 20:07

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General

Target

OfficeDocument.exe
Size

279KB
MD5

b04e5c4ad1bc75a4a0cd5686e869acdb
SHA1

8a8fadeb752362fb265baa83f690bc4250556d33
SHA256

0e735a5773b8aa36e2a596ea6e468d75038db7dd644236b4eb745b66762f4ebf
SHA512

c06212a009af916a8dd707eca6d1e24cf28ce6b8726b51663562cbf1598138aef5d02b13c3ba2ad5c56940ddb47558224d6d7aa752347e0321267791e7141cfa

Score

10^/10

buer loader

Malware Config

Extracted

Family

buer

grandbanking-api.com

Signatures

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

Buer Loader 1 IoCs

Detects Buer loader in memory or disk.

resource	yara_rule
behavioral2/memory/3308-4-0x0000000040000000-0x0000000040009000-memory.dmp	buer

Loads dropped DLL 1 IoCs

pid	Process
4652	OfficeDocument.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4652 set thread context of 3308	4652	OfficeDocument.exe	78

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
4652	OfficeDocument.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4652 wrote to memory of 3308	4652	OfficeDocument.exe	78
PID 4652 wrote to memory of 3308	4652	OfficeDocument.exe	78
PID 4652 wrote to memory of 3308	4652	OfficeDocument.exe	78
PID 4652 wrote to memory of 3308	4652	OfficeDocument.exe	78

C:\Users\Admin\AppData\Local\Temp\OfficeDocument.exe
"C:\Users\Admin\AppData\Local\Temp\OfficeDocument.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:4652
- C:\Users\Admin\AppData\Local\Temp\OfficeDocument.exe
  "C:\Users\Admin\AppData\Local\Temp\OfficeDocument.exe"
  2⤵
  PID:3308

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/3308-4-0x0000000040000000-0x0000000040009000-memory.dmp

Filesize
36KB

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