buer | 1c8260f2d597cfc1922ca72162e1eb3f8272c2d18fa41d77b145d32256c0063d

Analysis

max time kernel
61s
max time network
122s
platform
windows10_x64
resource
win10v20201028
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.

Processes:

resource	yara_rule
behavioral2/memory/2016-3-0x0000000040000000-0x0000000040009000-memory.dmp	buer
behavioral2/memory/2016-4-0x0000000040005DA8-mapping.dmp	buer
behavioral2/memory/2016-5-0x0000000040000000-0x0000000040009000-memory.dmp	buer

Loads dropped DLL 1 IoCs

Processes:

web.exe

pid process

4068 web.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

web.exe

description pid process target process

PID 4068 set thread context of 2016 4068 web.exe web.exe
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

Processes:

web.exe

pid process

4068 web.exe

pid	process
4068	web.exe

description	pid	process	target process
PID 4068 set thread context of 2016	4068	web.exe	web.exe

pid	process
4068	web.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

web.exe

description	pid	process	target process
PID 4068 wrote to memory of 2016	4068	web.exe	web.exe
PID 4068 wrote to memory of 2016	4068	web.exe	web.exe
PID 4068 wrote to memory of 2016	4068	web.exe	web.exe
PID 4068 wrote to memory of 2016	4068	web.exe	web.exe

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:4068

C:\Users\Admin\AppData\Local\Temp\web.exe
"C:\Users\Admin\AppData\Local\Temp\web.exe"
2⤵
PID:2016

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

\Users\Admin\AppData\Local\Temp\nsm31C5.tmp\System.dll
MD5
fccff8cb7a1067e23fd2e2b63971a8e1

SHA1
30e2a9e137c1223a78a0f7b0bf96a1c361976d91

SHA256
6fcea34c8666b06368379c6c402b5321202c11b00889401c743fb96c516c679e

SHA512
f4335e84e6f8d70e462a22f1c93d2998673a7616c868177cac3e8784a3be1d7d0bb96f2583fa0ed82f4f2b6b8f5d9b33521c279a42e055d80a94b4f3f1791e0c

Download Submit
memory/2016-3-0x0000000040000000-0x0000000040009000-memory.dmp

Filesize
36KB

Download
memory/2016-4-0x0000000040005DA8-mapping.dmp

Download
memory/2016-5-0x0000000040000000-0x0000000040009000-memory.dmp

Filesize
36KB

Download