buer | 6b208bb60a779b6b4e202aa7b7593cdc0695f0534527d8d3a66c13977ef1c572

Analysis

max time kernel
15s
max time network
9s
platform
windows7_x64
resource
win7v20201028
submitted
02-02-2021 17:52

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General

Target

faxer.exe
Size

115KB
MD5

edacbd011f5d6d4bd0646ebdff7499ca
SHA1

e2bf855bee49f9d5c27ad85721f850db858dd7af
SHA256

6b208bb60a779b6b4e202aa7b7593cdc0695f0534527d8d3a66c13977ef1c572
SHA512

9354c11d075761d4a8b1e63905950044e370e75db166ea3119a33e2de4874e9c9983ca4dd4be114a2a6ad390d8fa7712c49b441432bf7c741448ba6cf423c5aa

Score

10^/10

buer loader

Malware Config

Extracted

Family

buer

tokacpebanking.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/1712-5-0x0000000040000000-0x000000004000A000-memory.dmp	buer

Loads dropped DLL 1 IoCs

pid	Process
1812	faxer.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1812 set thread context of 1712	1812	faxer.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
1812	faxer.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 1812 wrote to memory of 1712	1812	faxer.exe	29
PID 1812 wrote to memory of 1712	1812	faxer.exe	29
PID 1812 wrote to memory of 1712	1812	faxer.exe	29
PID 1812 wrote to memory of 1712	1812	faxer.exe	29
PID 1812 wrote to memory of 1712	1812	faxer.exe	29

C:\Users\Admin\AppData\Local\Temp\faxer.exe
"C:\Users\Admin\AppData\Local\Temp\faxer.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1812
- C:\Users\Admin\AppData\Local\Temp\faxer.exe
  "C:\Users\Admin\AppData\Local\Temp\faxer.exe"
  2⤵
  PID:1712

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/1712-5-0x0000000040000000-0x000000004000A000-memory.dmp

Filesize
40KB

Download
memory/1812-2-0x0000000076241000-0x0000000076243000-memory.dmp

Filesize
8KB

Download