buer | 1c8260f2d597cfc1922ca72162e1eb3f8272c2d18fa41d77b145d32256c0063d

Analysis

max time kernel
118s
max time network
119s
platform
windows7_x64
resource
win7v20201028
submitted
30-11-2020 21:44

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General

Target

web.exe
Size

95KB
MD5

bf613fe70f790d4b932601daa60a8797
SHA1

b53db9020c6115cea9e36dc9764bd45e5d9cfd6c
SHA256

1c8260f2d597cfc1922ca72162e1eb3f8272c2d18fa41d77b145d32256c0063d
SHA512

ce53eab5bd74fc2c70cf01d44597e63f50d27d2baaaf25cb166ab0f2c83add4773d936bbbebdfe03b30cd0a677b6b269abf8c8af02b3597c055a149e416db286

Score

10^/10

buer loader

Malware Config

Extracted

Family

buer

basiliskbank.com

Signatures

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

Buer Loader 3 IoCs

Detects Buer loader in memory or disk.

resource	yara_rule
behavioral1/memory/1252-3-0x0000000040000000-0x0000000040009000-memory.dmp	buer
behavioral1/memory/1252-4-0x0000000040005DA8-mapping.dmp	buer
behavioral1/memory/1252-5-0x0000000040000000-0x0000000040009000-memory.dmp	buer

Loads dropped DLL 1 IoCs

pid	Process
756	web.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 756 set thread context of 1252	756	web.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
756	web.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 756 wrote to memory of 1252	756	web.exe	29
PID 756 wrote to memory of 1252	756	web.exe	29
PID 756 wrote to memory of 1252	756	web.exe	29
PID 756 wrote to memory of 1252	756	web.exe	29
PID 756 wrote to memory of 1252	756	web.exe	29

C:\Users\Admin\AppData\Local\Temp\web.exe
"C:\Users\Admin\AppData\Local\Temp\web.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:756
- C:\Users\Admin\AppData\Local\Temp\web.exe
  "C:\Users\Admin\AppData\Local\Temp\web.exe"
  2⤵
  PID:1252

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/1252-3-0x0000000040000000-0x0000000040009000-memory.dmp

Filesize
36KB

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memory/1252-5-0x0000000040000000-0x0000000040009000-memory.dmp

Filesize
36KB

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