buer | 22a04ec533322f6dbf3a1e99bc9094e6ecf2c7ce9bb2bfaa801cf30ed4aa0aba

Analysis

max time kernel
140s
max time network
136s
platform
windows10_x64
resource
win10v20201028
submitted
28-01-2021 16:36

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General

Target

Inv847.xls
Size

298KB
MD5

5938eec8bed03b1e9f1debc3e949592e
SHA1

fd164563202f9de52c6f0eba819322398efdb14f
SHA256

22a04ec533322f6dbf3a1e99bc9094e6ecf2c7ce9bb2bfaa801cf30ed4aa0aba
SHA512

98b9b5fa2f33ad77d7e3953fa6e571a05b9c28b7ab8c3e5519060f1091e111e168e3124e19b4fc828a8a5d28cdcce795ae553a0200bb01f43c8fb985732e64c5

Score

10^/10

buer loader

Malware Config

Extracted

Family

buer

randomresultgenerator.com

Signatures

Buer
Buer is a new modular loader first seen in August 2019.
loader buer

Buer Loader 2 IoCs

Detects Buer loader in memory or disk.

resource	yara_rule
behavioral2/files/0x000300000000068f-8.dat	buer
behavioral2/files/0x000300000000068f-9.dat	buer

Executes dropped EXE 1 IoCs

pid	Process
3448	winscp.exe

Checks processor information in registry 2 TTPs 3 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	EXCEL.EXE

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
644	EXCEL.EXE

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
644	EXCEL.EXE
644	EXCEL.EXE
644	EXCEL.EXE
644	EXCEL.EXE
644	EXCEL.EXE
644	EXCEL.EXE
644	EXCEL.EXE
644	EXCEL.EXE
644	EXCEL.EXE
644	EXCEL.EXE
644	EXCEL.EXE
644	EXCEL.EXE

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 644 wrote to memory of 3448	644	EXCEL.EXE	77
PID 644 wrote to memory of 3448	644	EXCEL.EXE	77
PID 644 wrote to memory of 3448	644	EXCEL.EXE	77

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\Inv847.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:644
- C:\SlockSt\Uptqeodk\winscp.exe
  "C:\SlockSt\Uptqeodk\winscp.exe"
  2⤵
  - Executes dropped EXE
  PID:3448

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/644-2-0x00007FF9DD1F0000-0x00007FF9DD200000-memory.dmp

Filesize
64KB

Download
memory/644-3-0x00007FF9DD1F0000-0x00007FF9DD200000-memory.dmp

Filesize
64KB

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memory/644-4-0x00007FF9DD1F0000-0x00007FF9DD200000-memory.dmp

Filesize
64KB

Download
memory/644-6-0x00007FF9DD1F0000-0x00007FF9DD200000-memory.dmp

Filesize
64KB

Download
memory/644-5-0x00007FFA00780000-0x00007FFA00DB7000-memory.dmp

Filesize
6.2MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads