buer | 22a04ec533322f6dbf3a1e99bc9094e6ecf2c7ce9bb2bfaa801cf30ed4aa0aba

General

Target

Inv847.xls
Size

298KB
MD5

5938eec8bed03b1e9f1debc3e949592e
SHA1

fd164563202f9de52c6f0eba819322398efdb14f
SHA256

22a04ec533322f6dbf3a1e99bc9094e6ecf2c7ce9bb2bfaa801cf30ed4aa0aba
SHA512

98b9b5fa2f33ad77d7e3953fa6e571a05b9c28b7ab8c3e5519060f1091e111e168e3124e19b4fc828a8a5d28cdcce795ae553a0200bb01f43c8fb985732e64c5

Score

10^/10

buer loader

Malware Config

Extracted

Language

xlm4.0

Source

URLs

xlm40.dropper

http://88.119.175.189/document.ssl

Extracted

Family

buer

C2

randomresultgenerator.com

Signatures

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

Buer Loader 3 IoCs

Detects Buer loader in memory or disk.

resource	yara_rule
behavioral1/files/0x0003000000013105-6.dat	buer
behavioral1/files/0x0003000000013105-9.dat	buer
behavioral1/files/0x0003000000013105-7.dat	buer

Executes dropped EXE 1 IoCs

pid	Process
1012	winscp.exe

Loads dropped DLL 2 IoCs

pid	Process
744	EXCEL.EXE
744	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 (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	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\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
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
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

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
744	EXCEL.EXE

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
744	EXCEL.EXE
744	EXCEL.EXE
744	EXCEL.EXE

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 744 wrote to memory of 1012	744	EXCEL.EXE	31
PID 744 wrote to memory of 1012	744	EXCEL.EXE	31
PID 744 wrote to memory of 1012	744	EXCEL.EXE	31
PID 744 wrote to memory of 1012	744	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\Inv847.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:744
- C:\SlockSt\Uptqeodk\winscp.exe
  "C:\SlockSt\Uptqeodk\winscp.exe"
  2⤵
  - Executes dropped EXE
  PID:1012

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/744-2-0x000000002F0C1000-0x000000002F0C4000-memory.dmp

Filesize
12KB

Download
memory/744-3-0x0000000071441000-0x0000000071443000-memory.dmp

Filesize
8KB

Download
memory/744-4-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1412-5-0x000007FEF7590000-0x000007FEF780A000-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