buer | 711a05c2b42db93458407fc8d81cdd8d5c92a5cf44e5cab4e9ca58f5267d3cab

General

Target

Notice-Delivery2020.xlsm
Size

430KB
MD5

0b49c3bd2479bed644ee5f0a21bdeabb
SHA1

2f63381e01e5c6c2dd0b2759a645c7aae6019a49
SHA256

711a05c2b42db93458407fc8d81cdd8d5c92a5cf44e5cab4e9ca58f5267d3cab
SHA512

9d3b2e7d253b18a3cdcd05f908c8826e33401bb34ece07d42f0ee0f53b5f9d1a66f85459990bdf43401a8970e9d4cbe5c482f2578fcbec9994dbebaacb95a459

Score

10^/10

buer loader

Malware Config

Extracted

Family

buer

C2

heartprogseds.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
behavioral2/memory/1592-7-0x0000000040000000-0x0000000040009000-memory.dmp	buer
behavioral2/memory/1592-8-0x0000000040005DA8-mapping.dmp	buer
behavioral2/memory/1592-10-0x0000000040000000-0x0000000040009000-memory.dmp	buer

Executes dropped EXE 2 IoCs

pid	Process
3012	MSettingExcel.exe
1592	MSettingExcel.exe

Loads dropped DLL 1 IoCs

pid	Process
3012	MSettingExcel.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3012 set thread context of 1592	3012	MSettingExcel.exe	80

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

NSIS installer 6 IoCs

installer

resource	yara_rule
behavioral2/files/0x0002000000015614-4.dat	nsis_installer_1
behavioral2/files/0x0002000000015614-4.dat	nsis_installer_2
behavioral2/files/0x0002000000015614-5.dat	nsis_installer_1
behavioral2/files/0x0002000000015614-5.dat	nsis_installer_2
behavioral2/files/0x0002000000015614-9.dat	nsis_installer_1
behavioral2/files/0x0002000000015614-9.dat	nsis_installer_2

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
1924	EXCEL.EXE

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
3012	MSettingExcel.exe

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
1924	EXCEL.EXE
1924	EXCEL.EXE
1924	EXCEL.EXE
1924	EXCEL.EXE
1924	EXCEL.EXE
1924	EXCEL.EXE
1924	EXCEL.EXE
1924	EXCEL.EXE
1924	EXCEL.EXE
1924	EXCEL.EXE
1924	EXCEL.EXE
1924	EXCEL.EXE

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 1924 wrote to memory of 3012	1924	EXCEL.EXE	76
PID 1924 wrote to memory of 3012	1924	EXCEL.EXE	76
PID 1924 wrote to memory of 3012	1924	EXCEL.EXE	76
PID 3012 wrote to memory of 1592	3012	MSettingExcel.exe	80
PID 3012 wrote to memory of 1592	3012	MSettingExcel.exe	80
PID 3012 wrote to memory of 1592	3012	MSettingExcel.exe	80
PID 3012 wrote to memory of 1592	3012	MSettingExcel.exe	80

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\Notice-Delivery2020.xlsm"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1924
- C:\offic\offiekra\MSettingExcel.exe
  "C:\offic\offiekra\MSettingExcel.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of SetThreadContext
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:3012
- - C:\offic\offiekra\MSettingExcel.exe
    "C:\offic\offiekra\MSettingExcel.exe"
    3⤵
    - Executes dropped EXE
    PID:1592

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/1592-7-0x0000000040000000-0x0000000040009000-memory.dmp

Filesize
36KB

Download
memory/1592-10-0x0000000040000000-0x0000000040009000-memory.dmp

Filesize
36KB

Download
memory/1924-2-0x00007FFB89D60000-0x00007FFB8A397000-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