buer | 5194873f8a8932619732b1adc041b83a4c7186ddf913ba3563d01ed8d3ef538a

General

Target

Inv996.xls
Size

201KB
MD5

0bbffdaacf9eca0db2176c4b2585b814
SHA1

c1cf73e253d3ddd90984349c1f45638ceafaa63b
SHA256

5194873f8a8932619732b1adc041b83a4c7186ddf913ba3563d01ed8d3ef538a
SHA512

fe6d7354b36762cce5afce085f8391d663066fff77286a8543a074e820e1fc55933a273bf52f2056390d724071ed43b7bc2998b111b65037c2824af09e321987

Score

10^/10

buer loader

Malware Config

Extracted

Family

buer

C2

jerryskaxtebilling.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/memory/2292-11-0x00000000001D0000-0x00000000001D8000-memory.dmp	buer
behavioral2/memory/2292-12-0x0000000040000000-0x000000004000A000-memory.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
2292	wineditor.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
508	EXCEL.EXE

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
508	EXCEL.EXE
508	EXCEL.EXE
508	EXCEL.EXE
508	EXCEL.EXE
508	EXCEL.EXE
508	EXCEL.EXE
508	EXCEL.EXE
508	EXCEL.EXE
508	EXCEL.EXE
508	EXCEL.EXE
508	EXCEL.EXE
508	EXCEL.EXE

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 508 wrote to memory of 2292	508	EXCEL.EXE	77
PID 508 wrote to memory of 2292	508	EXCEL.EXE	77
PID 508 wrote to memory of 2292	508	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\Inv996.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:508
- C:\BlockSt\Uptqeodk\wineditor.exe
  "C:\BlockSt\Uptqeodk\wineditor.exe"
  2⤵
  - Executes dropped EXE
  PID:2292

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/508-2-0x00007FFA91E20000-0x00007FFA91E30000-memory.dmp

Filesize
64KB

Download
memory/508-3-0x00007FFA91E20000-0x00007FFA91E30000-memory.dmp

Filesize
64KB

Download
memory/508-4-0x00007FFA91E20000-0x00007FFA91E30000-memory.dmp

Filesize
64KB

Download
memory/508-5-0x00007FFA91E20000-0x00007FFA91E30000-memory.dmp

Filesize
64KB

Download
memory/508-6-0x00007FFAB5AB0000-0x00007FFAB60E7000-memory.dmp

Filesize
6.2MB

Download
memory/2292-10-0x0000000002280000-0x0000000002281000-memory.dmp

Filesize
4KB

Download
memory/2292-11-0x00000000001D0000-0x00000000001D8000-memory.dmp

Filesize
32KB

Download
memory/2292-12-0x0000000040000000-0x000000004000A000-memory.dmp

Filesize
40KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads