buer | 4f7ccbc55dda5ed45be0fc7dc48b18719556ac9018d5aa4eb9f9ff0470eaca95

Analysis

max time kernel
39s
max time network
40s
platform
windows7_x64
resource
win7v20201028
submitted
01-02-2021 20:39

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General

Target

winword.exe
Size

82KB
MD5

49392cc9138f2d685737955950fd8d69
SHA1

8b418f639b4bc71ab224972537278f2d23676df8
SHA256

4f7ccbc55dda5ed45be0fc7dc48b18719556ac9018d5aa4eb9f9ff0470eaca95
SHA512

a75a58cda433f1baeeede01418661fc57512ba52dba585e2cf576294d7be4e39e9fc6af588cd5a3f855665abd038ca4d711567c22bbb1505752421d6357ff123

Score

10^/10

buer loader

Malware Config

Extracted

Family

buer

webgraitupeople.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/1640-5-0x0000000040000000-0x000000004000A000-memory.dmp	buer

Loads dropped DLL 1 IoCs

pid	Process
2044	winword.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2044 set thread context of 1640	2044	winword.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
2044	winword.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 2044 wrote to memory of 1640	2044	winword.exe	29
PID 2044 wrote to memory of 1640	2044	winword.exe	29
PID 2044 wrote to memory of 1640	2044	winword.exe	29
PID 2044 wrote to memory of 1640	2044	winword.exe	29
PID 2044 wrote to memory of 1640	2044	winword.exe	29
PID 2044 wrote to memory of 1640	2044	winword.exe	29
PID 2044 wrote to memory of 1640	2044	winword.exe	29
PID 2044 wrote to memory of 1640	2044	winword.exe	29

C:\Users\Admin\AppData\Local\Temp\winword.exe
"C:\Users\Admin\AppData\Local\Temp\winword.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2044
- C:\Users\Admin\AppData\Local\Temp\winword.exe
  "C:\Users\Admin\AppData\Local\Temp\winword.exe"
  2⤵
  PID:1640

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/1640-5-0x0000000040000000-0x000000004000A000-memory.dmp

Filesize
40KB

Download
memory/2044-2-0x0000000075251000-0x0000000075253000-memory.dmp

Filesize
8KB

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