buer | cf4c2af3c3e4ec4658c9ee98da829643c85071dec8b91085af1c2ee2811d406a

General

Target

SecuriteInfo.com.Exploit.Siggen3.8959.26365.55.xls
Size

386KB
MD5

d16f23f1d5b520fa2407793e2318bbec
SHA1

58d25900741a1a1fc5e8617322eab6957c520c44
SHA256

cf4c2af3c3e4ec4658c9ee98da829643c85071dec8b91085af1c2ee2811d406a
SHA512

93cc56319363704a325703ec512643ad15041def3abed5e56f1029d9658d63ee03444ef6e5c59654ce91f97551366fceca6b0d34c53fd78f9c726b69217a4c4c

Score

10^/10

buer loader

Malware Config

Extracted

Language

xlm4.0

Source

URLs

xlm40.dropper

http://213.252.244.225/font.tiff

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/572-11-0x00000000001B0000-0x00000000001B8000-memory.dmp	buer
behavioral1/memory/572-12-0x0000000040000000-0x000000004000A000-memory.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
572	printeditor.exe

Loads dropped DLL 2 IoCs

pid	Process
1684	EXCEL.EXE
1684	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
Key created	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\Toolbar	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	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
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
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 (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\MenuExt	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
Key created	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
1684	EXCEL.EXE

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
1684	EXCEL.EXE
1684	EXCEL.EXE
1684	EXCEL.EXE

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1684 wrote to memory of 572	1684	EXCEL.EXE	31
PID 1684 wrote to memory of 572	1684	EXCEL.EXE	31
PID 1684 wrote to memory of 572	1684	EXCEL.EXE	31
PID 1684 wrote to memory of 572	1684	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\SecuriteInfo.com.Exploit.Siggen3.8959.26365.55.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:1684
- C:\Corporate\globfgef\printeditor.exe
  "C:\Corporate\globfgef\printeditor.exe"
  2⤵
  - Executes dropped EXE
  PID:572

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/572-10-0x0000000001E90000-0x0000000001EA1000-memory.dmp

Filesize
68KB

Download
memory/572-11-0x00000000001B0000-0x00000000001B8000-memory.dmp

Filesize
32KB

Download
memory/572-12-0x0000000040000000-0x000000004000A000-memory.dmp

Filesize
40KB

Download
memory/1684-2-0x000000002F941000-0x000000002F944000-memory.dmp

Filesize
12KB

Download
memory/1684-3-0x0000000071AC1000-0x0000000071AC3000-memory.dmp

Filesize
8KB

Download
memory/1684-4-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1712-5-0x000007FEF68D0000-0x000007FEF6B4A000-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