buer | 25840b76b6cf2762898086cd4b62e556bedb9ffcff1a565bad872662c2e5bb36

Resubmissions

12-02-2021 17:46

210212-qj1pxv26za 10

12-02-2021 13:49

210212-qh2m1q4eyx 10

Analysis

max time kernel
56s
max time network
112s
platform
windows10_x64
resource
win10v20201028
submitted
12-02-2021 17:46

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General

Target

independent_appraisal.jar
Size

6KB
MD5

e94dbabc70b4396b39d3a3d3e53cf85b
SHA1

bc6f6267313c0a768ed3f8f92f90c1f105cbd949
SHA256

25840b76b6cf2762898086cd4b62e556bedb9ffcff1a565bad872662c2e5bb36
SHA512

fb2eb9aeb02d111c23cdb61f668affcfb3e847159ce8a158ed39e2f136b9993f8dc68ddbd649d8f13f75ced7f7499c6410861daa1fde8fb15c010c6ccd2f3582

Score

10^/10

buer loader

Malware Config

Extracted

Family

buer

antipublicwestbank.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/3428-9-0x0000000040000000-0x000000004000A000-memory.dmp	buer

Executes dropped EXE 2 IoCs

pid	Process
3576	vdeodrv32.exe
3428	vdeodrv32.exe

Loads dropped DLL 1 IoCs

pid	Process
3576	vdeodrv32.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3576 set thread context of 3428	3576	vdeodrv32.exe	81

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

NSIS installer 6 IoCs

installer

resource	yara_rule
behavioral2/files/0x000300000001ab81-4.dat	nsis_installer_1
behavioral2/files/0x000300000001ab81-4.dat	nsis_installer_2
behavioral2/files/0x000300000001ab81-5.dat	nsis_installer_1
behavioral2/files/0x000300000001ab81-5.dat	nsis_installer_2
behavioral2/files/0x000300000001ab81-8.dat	nsis_installer_1
behavioral2/files/0x000300000001ab81-8.dat	nsis_installer_2

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
3576	vdeodrv32.exe

Suspicious use of SetWindowsHookEx 4 IoCs

pid	Process
496	java.exe
496	java.exe
496	java.exe
496	java.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 496 wrote to memory of 3576	496	java.exe	80
PID 496 wrote to memory of 3576	496	java.exe	80
PID 496 wrote to memory of 3576	496	java.exe	80
PID 3576 wrote to memory of 3428	3576	vdeodrv32.exe	81
PID 3576 wrote to memory of 3428	3576	vdeodrv32.exe	81
PID 3576 wrote to memory of 3428	3576	vdeodrv32.exe	81
PID 3576 wrote to memory of 3428	3576	vdeodrv32.exe	81

C:\ProgramData\Oracle\Java\javapath\java.exe
java -jar C:\Users\Admin\AppData\Local\Temp\independent_appraisal.jar
1⤵
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:496
- C:\ProgramData\vdeodrv32.exe
  "C:\ProgramData\vdeodrv32.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of SetThreadContext
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:3576
- - C:\ProgramData\vdeodrv32.exe
    "C:\ProgramData\vdeodrv32.exe"
    3⤵
    - Executes dropped EXE
    PID:3428

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/496-2-0x00000000034C0000-0x0000000003730000-memory.dmp

Filesize
2.4MB

Download
memory/3428-9-0x0000000040000000-0x000000004000A000-memory.dmp

Filesize
40KB

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