buer | 030af453e0140f45b22c9e2fa1dc1441371e55455e4d207eaed78229800ff6b7

General

Target

Invoice.xls
Size

254KB
MD5

32d28b4f61d985d50cf9beb53cee4ad7
SHA1

e5abe4cfd0b9b23f7e3cf35a9df676d202d27887
SHA256

030af453e0140f45b22c9e2fa1dc1441371e55455e4d207eaed78229800ff6b7
SHA512

e446f74d80fb3b64b1666f92259e8ad5cdb810e97215520d747e8dd49cb884a6aaffd185e90f68a67fc37feab0b409c0f4b8c8cfbe680d6fd316ff5d8f228f8c

Score

10^/10

buer loader

Malware Config

Extracted

Family

buer

C2

tokacpebanking.com

Signatures

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

Buer Loader 1 IoCs

Detects Buer loader in memory or disk.

resource	yara_rule
behavioral1/memory/1240-17-0x0000000040000000-0x000000004000A000-memory.dmp	buer

Executes dropped EXE 2 IoCs

pid	Process
876	outlook.exe
1240	outlook.exe

Loads dropped DLL 1 IoCs

pid	Process
876	outlook.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 876 set thread context of 1240	876	outlook.exe	84

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

System Information Discovery
T1082

NSIS installer 8 IoCs

installer

resource	yara_rule
	nsis_installer_1
	nsis_installer_2
behavioral1/files/0x0002000000015661-8.dat	nsis_installer_1
behavioral1/files/0x0002000000015661-8.dat	nsis_installer_2
behavioral1/files/0x0002000000015661-9.dat	nsis_installer_1
behavioral1/files/0x0002000000015661-9.dat	nsis_installer_2
behavioral1/files/0x0002000000015661-16.dat	nsis_installer_1
behavioral1/files/0x0002000000015661-16.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 value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	EXCEL.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	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
4772	EXCEL.EXE

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
876	outlook.exe

Suspicious use of SetWindowsHookEx 13 IoCs

pid	Process
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 4772 wrote to memory of 876	4772	EXCEL.EXE	83
PID 4772 wrote to memory of 876	4772	EXCEL.EXE	83
PID 4772 wrote to memory of 876	4772	EXCEL.EXE	83
PID 876 wrote to memory of 1240	876	outlook.exe	84
PID 876 wrote to memory of 1240	876	outlook.exe	84
PID 876 wrote to memory of 1240	876	outlook.exe	84
PID 876 wrote to memory of 1240	876	outlook.exe	84

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\Invoice.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4772
- C:\jobtitle\spaceodk\outlook.exe
  "C:\jobtitle\spaceodk\outlook.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of SetThreadContext
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:876
- - C:\jobtitle\spaceodk\outlook.exe
    "C:\jobtitle\spaceodk\outlook.exe"
    3⤵
    - Executes dropped EXE
    PID:1240

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/1240-17-0x0000000040000000-0x000000004000A000-memory.dmp

Filesize
40KB

Download
memory/4772-6-0x00007FFBC05B0000-0x00007FFBC05C0000-memory.dmp

Filesize
64KB

Download
memory/4772-2-0x00007FFBC05B0000-0x00007FFBC05C0000-memory.dmp

Filesize
64KB

Download
memory/4772-12-0x00007FFBC05B0000-0x00007FFBC05C0000-memory.dmp

Filesize
64KB

Download
memory/4772-11-0x00007FFBC05B0000-0x00007FFBC05C0000-memory.dmp

Filesize
64KB

Download
memory/4772-13-0x00007FFBC05B0000-0x00007FFBC05C0000-memory.dmp

Filesize
64KB

Download
memory/4772-14-0x00007FFBC05B0000-0x00007FFBC05C0000-memory.dmp

Filesize
64KB

Download
memory/4772-5-0x00007FFBE4330000-0x00007FFBE4967000-memory.dmp

Filesize
6.2MB

Download
memory/4772-4-0x00007FFBC05B0000-0x00007FFBC05C0000-memory.dmp

Filesize
64KB

Download
memory/4772-3-0x00007FFBC05B0000-0x00007FFBC05C0000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads