buer | 9cd888fa0692f8d0ca69548532ae72171b426d0e9d8b3b46acdbbe7636d653da

Analysis

max time kernel
150s
max time network
151s
platform
windows7_x64
resource
win7v20201028
submitted
03-02-2021 21:37

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General

Target

form.txt.exe
Size

123KB
MD5

cb80d26975639b66bb5ecd1f90e623ed
SHA1

95c973e9aad17101b29bd195f9c4624922d987ee
SHA256

9cd888fa0692f8d0ca69548532ae72171b426d0e9d8b3b46acdbbe7636d653da
SHA512

2adf13898114f0a2ebe3b8d279ae3dbc6693db4b44ac7a35ca9e61064caf77edbcbc6b4389542529d74d8347752b7ea00ea969ad7cc8ba6fa5dc0def31f32040

Score

10^/10

buer loader

Malware Config

Extracted

Family

buer

officewestbankingconc.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
behavioral1/memory/1528-5-0x0000000040000000-0x000000004000A000-memory.dmp	buer

Loads dropped DLL 1 IoCs

pid	Process
792	form.txt.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 792 set thread context of 1528	792	form.txt.exe	29

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
792	form.txt.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 792 wrote to memory of 1528	792	form.txt.exe	29
PID 792 wrote to memory of 1528	792	form.txt.exe	29
PID 792 wrote to memory of 1528	792	form.txt.exe	29
PID 792 wrote to memory of 1528	792	form.txt.exe	29
PID 792 wrote to memory of 1528	792	form.txt.exe	29

C:\Users\Admin\AppData\Local\Temp\form.txt.exe
"C:\Users\Admin\AppData\Local\Temp\form.txt.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:792
- C:\Users\Admin\AppData\Local\Temp\form.txt.exe
  "C:\Users\Admin\AppData\Local\Temp\form.txt.exe"
  2⤵
  PID:1528

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/792-2-0x00000000765E1000-0x00000000765E3000-memory.dmp

Filesize
8KB

Download
memory/1528-5-0x0000000040000000-0x000000004000A000-memory.dmp

Filesize
40KB

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