buer | 6b208bb60a779b6b4e202aa7b7593cdc0695f0534527d8d3a66c13977ef1c572

Analysis

max time kernel
61s
max time network
124s
platform
windows10_x64
resource
win10v20201028
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
behavioral2/memory/944-4-0x0000000040000000-0x000000004000A000-memory.dmp	buer

Loads dropped DLL 1 IoCs

pid	Process
3976	faxer.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3976 set thread context of 944	3976	faxer.exe	79

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
3976	faxer.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3976 wrote to memory of 944	3976	faxer.exe	79
PID 3976 wrote to memory of 944	3976	faxer.exe	79
PID 3976 wrote to memory of 944	3976	faxer.exe	79
PID 3976 wrote to memory of 944	3976	faxer.exe	79

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:3976
- C:\Users\Admin\AppData\Local\Temp\faxer.exe
  "C:\Users\Admin\AppData\Local\Temp\faxer.exe"
  2⤵
  PID:944

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/944-4-0x0000000040000000-0x000000004000A000-memory.dmp

Filesize
40KB

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