buer | f2df4c45300e982fc3c0131ad426ea3b55d28e983ec3221f243f4c496ca618b1

General

Target

f2df4c45300e982fc3c0131ad426ea3b55d28e983ec3221f243f4c496ca618b1.exe
Size

1.8MB
MD5

5fcc7f613eb5fe47512efb5c67830712
SHA1

0db872d896a9991aa6703cb0d7d7960fa8c2a0e8
SHA256

f2df4c45300e982fc3c0131ad426ea3b55d28e983ec3221f243f4c496ca618b1
SHA512

a5d4133fe3b8f13dc02eb319403021834ed63595331a8530d0775bc1a6c83a80983fa7a5cf548a47c058263cc8a1a5c0a719df55b9becafa296c1cd95f39a5e2

Score

10^/10

buer evasion loader persistence

Malware Config

Extracted

Family

buer

C2

http://loy01.top/

http://loy02.top/

Signatures

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

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3762437355-3468409815-1164039494-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\UBlockPlugin\\plugin.exe\""	plugin.exe

Buer Loader 4 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral1/memory/1900-59-0x000000003FA80000-0x000000003FF08000-memory.dmp	buer
behavioral1/memory/1772-64-0x000000003FF10000-0x0000000040398000-memory.dmp	buer
behavioral1/memory/1772-66-0x000000003FF10000-0x0000000040398000-memory.dmp	buer
behavioral1/memory/1772-67-0x000000003FF10000-0x0000000040398000-memory.dmp	buer

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 2 IoCs

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	plugin.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	f2df4c45300e982fc3c0131ad426ea3b55d28e983ec3221f243f4c496ca618b1.exe

Executes dropped EXE 1 IoCs

pid	Process
1772	plugin.exe

Checks BIOS information in registry 2 TTPs 4 IoCs

BIOS 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\SystemBiosVersion	f2df4c45300e982fc3c0131ad426ea3b55d28e983ec3221f243f4c496ca618b1.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	f2df4c45300e982fc3c0131ad426ea3b55d28e983ec3221f243f4c496ca618b1.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	plugin.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	plugin.exe

Deletes itself 1 IoCs

pid	Process
1772	plugin.exe

Identifies Wine through registry keys 2 TTPs 2 IoCs

Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3762437355-3468409815-1164039494-1000\Software\Wine	f2df4c45300e982fc3c0131ad426ea3b55d28e983ec3221f243f4c496ca618b1.exe
Key opened	\REGISTRY\USER\S-1-5-21-3762437355-3468409815-1164039494-1000\Software\Wine	plugin.exe

Loads dropped DLL 2 IoCs

pid	Process
1900	f2df4c45300e982fc3c0131ad426ea3b55d28e983ec3221f243f4c496ca618b1.exe
1900	f2df4c45300e982fc3c0131ad426ea3b55d28e983ec3221f243f4c496ca618b1.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1900	f2df4c45300e982fc3c0131ad426ea3b55d28e983ec3221f243f4c496ca618b1.exe
1772	plugin.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1900	f2df4c45300e982fc3c0131ad426ea3b55d28e983ec3221f243f4c496ca618b1.exe
1772	plugin.exe
1772	plugin.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1900 wrote to memory of 1772	1900	f2df4c45300e982fc3c0131ad426ea3b55d28e983ec3221f243f4c496ca618b1.exe	27
PID 1900 wrote to memory of 1772	1900	f2df4c45300e982fc3c0131ad426ea3b55d28e983ec3221f243f4c496ca618b1.exe	27
PID 1900 wrote to memory of 1772	1900	f2df4c45300e982fc3c0131ad426ea3b55d28e983ec3221f243f4c496ca618b1.exe	27
PID 1900 wrote to memory of 1772	1900	f2df4c45300e982fc3c0131ad426ea3b55d28e983ec3221f243f4c496ca618b1.exe	27
PID 1772 wrote to memory of 640	1772	plugin.exe	28
PID 1772 wrote to memory of 640	1772	plugin.exe	28
PID 1772 wrote to memory of 640	1772	plugin.exe	28
PID 1772 wrote to memory of 640	1772	plugin.exe	28

C:\Users\Admin\AppData\Local\Temp\f2df4c45300e982fc3c0131ad426ea3b55d28e983ec3221f243f4c496ca618b1.exe
"C:\Users\Admin\AppData\Local\Temp\f2df4c45300e982fc3c0131ad426ea3b55d28e983ec3221f243f4c496ca618b1.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Identifies Wine through registry keys
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1900
- C:\ProgramData\UBlockPlugin\plugin.exe
  C:\ProgramData\UBlockPlugin\plugin.exe "C:\Users\Admin\AppData\Local\Temp\f2df4c45300e982fc3c0131ad426ea3b55d28e983ec3221f243f4c496ca618b1.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Identifies VirtualBox via ACPI registry values (likely anti-VM)
  - Executes dropped EXE
  - Checks BIOS information in registry
  - Deletes itself
  - Identifies Wine through registry keys
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:1772
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\UBlockPlugin\plugin.exe
    3⤵
    PID:640

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

1

T1004

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Virtualization/Sandbox Evasion

2

T1497

Credential Access

Discovery

Query Registry

3

T1012

System Information Discovery

1

T1082

Virtualization/Sandbox Evasion

2

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\UBlockPlugin\plugin.exe

Filesize
1.8MB

MD5
5fcc7f613eb5fe47512efb5c67830712

SHA1
0db872d896a9991aa6703cb0d7d7960fa8c2a0e8

SHA256
f2df4c45300e982fc3c0131ad426ea3b55d28e983ec3221f243f4c496ca618b1

SHA512
a5d4133fe3b8f13dc02eb319403021834ed63595331a8530d0775bc1a6c83a80983fa7a5cf548a47c058263cc8a1a5c0a719df55b9becafa296c1cd95f39a5e2

Download Submit
C:\ProgramData\UBlockPlugin\plugin.exe

Filesize
1.8MB

MD5
5fcc7f613eb5fe47512efb5c67830712

SHA1
0db872d896a9991aa6703cb0d7d7960fa8c2a0e8

SHA256
f2df4c45300e982fc3c0131ad426ea3b55d28e983ec3221f243f4c496ca618b1

SHA512
a5d4133fe3b8f13dc02eb319403021834ed63595331a8530d0775bc1a6c83a80983fa7a5cf548a47c058263cc8a1a5c0a719df55b9becafa296c1cd95f39a5e2

Download Submit
\ProgramData\UBlockPlugin\plugin.exe

Filesize
1.8MB

MD5
5fcc7f613eb5fe47512efb5c67830712

SHA1
0db872d896a9991aa6703cb0d7d7960fa8c2a0e8

SHA256
f2df4c45300e982fc3c0131ad426ea3b55d28e983ec3221f243f4c496ca618b1

SHA512
a5d4133fe3b8f13dc02eb319403021834ed63595331a8530d0775bc1a6c83a80983fa7a5cf548a47c058263cc8a1a5c0a719df55b9becafa296c1cd95f39a5e2

Download Submit
\ProgramData\UBlockPlugin\plugin.exe

Filesize
1.8MB

MD5
5fcc7f613eb5fe47512efb5c67830712

SHA1
0db872d896a9991aa6703cb0d7d7960fa8c2a0e8

SHA256
f2df4c45300e982fc3c0131ad426ea3b55d28e983ec3221f243f4c496ca618b1

SHA512
a5d4133fe3b8f13dc02eb319403021834ed63595331a8530d0775bc1a6c83a80983fa7a5cf548a47c058263cc8a1a5c0a719df55b9becafa296c1cd95f39a5e2

Download Submit
memory/1772-63-0x0000000077B80000-0x0000000077D00000-memory.dmp

Filesize
1.5MB

Download
memory/1772-61-0x000000003FF10000-0x0000000040398000-memory.dmp

Filesize
4.5MB

Download
memory/1772-64-0x000000003FF10000-0x0000000040398000-memory.dmp

Filesize
4.5MB

Download
memory/1772-66-0x000000003FF10000-0x0000000040398000-memory.dmp

Filesize
4.5MB

Download
memory/1772-67-0x000000003FF10000-0x0000000040398000-memory.dmp

Filesize
4.5MB

Download
memory/1900-59-0x000000003FA80000-0x000000003FF08000-memory.dmp

Filesize
4.5MB

Download
memory/1900-54-0x0000000075CB1000-0x0000000075CB3000-memory.dmp

Filesize
8KB

Download
memory/1900-60-0x0000000077B80000-0x0000000077D00000-memory.dmp

Filesize
1.5MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads