buer | 5194873f8a8932619732b1adc041b83a4c7186ddf913ba3563d01ed8d3ef538a

General

Target

Inv996.xls
Size

201KB
MD5

0bbffdaacf9eca0db2176c4b2585b814
SHA1

c1cf73e253d3ddd90984349c1f45638ceafaa63b
SHA256

5194873f8a8932619732b1adc041b83a4c7186ddf913ba3563d01ed8d3ef538a
SHA512

fe6d7354b36762cce5afce085f8391d663066fff77286a8543a074e820e1fc55933a273bf52f2056390d724071ed43b7bc2998b111b65037c2824af09e321987

Score

10^/10

buer loader

Malware Config

Extracted

Language

xlm4.0

Source

URLs

xlm40.dropper

http://213.252.244.225/530340.cls

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
behavioral1/memory/1476-11-0x00000000003A0000-0x00000000003A8000-memory.dmp	buer
behavioral1/memory/1476-12-0x0000000040000000-0x000000004000A000-memory.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
1476	wineditor.exe

Loads dropped DLL 2 IoCs

pid	Process
1432	EXCEL.EXE
1432	EXCEL.EXE

Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\FloatingPointProcessor	EXCEL.EXE

Modifies Internet Explorer settings 1 TTPs 9 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\Toolbar	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\EXCEL.EXE/3000"	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\ONBttnIE.dll/105"	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
1432	EXCEL.EXE

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
1432	EXCEL.EXE
1432	EXCEL.EXE
1432	EXCEL.EXE

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1432 wrote to memory of 1476	1432	EXCEL.EXE	31
PID 1432 wrote to memory of 1476	1432	EXCEL.EXE	31
PID 1432 wrote to memory of 1476	1432	EXCEL.EXE	31
PID 1432 wrote to memory of 1476	1432	EXCEL.EXE	31

C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE
"C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" /dde C:\Users\Admin\AppData\Local\Temp\Inv996.xls
1⤵
- Loads dropped DLL
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1432
- C:\BlockSt\Uptqeodk\wineditor.exe
  "C:\BlockSt\Uptqeodk\wineditor.exe"
  2⤵
  - Executes dropped EXE
  PID:1476

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/1432-2-0x000000002F761000-0x000000002F764000-memory.dmp

Filesize
12KB

Download
memory/1432-3-0x00000000713C1000-0x00000000713C3000-memory.dmp

Filesize
8KB

Download
memory/1432-4-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1476-10-0x0000000001C40000-0x0000000001C51000-memory.dmp

Filesize
68KB

Download
memory/1476-11-0x00000000003A0000-0x00000000003A8000-memory.dmp

Filesize
32KB

Download
memory/1476-12-0x0000000040000000-0x000000004000A000-memory.dmp

Filesize
40KB

Download
memory/1520-5-0x000007FEF61D0000-0x000007FEF644A000-memory.dmp

Filesize
2.5MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads