buer | 415ecf85cc1e03aa1ec4628e4fb918f3a7bcc698604e47e370d92659894669dc

Analysis

max time kernel
152s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-20220414-en
submitted
08/07/2022, 05:57

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General

Target
415ecf85cc1e03aa1ec4628e4fb918f3a7bcc698604e47e370d92659894669dc.exe
Size 1.8MB
Sample220708-gnxfasccan
SHA256 415ecf85cc1e03aa1ec4628e4fb918f3a7bcc698604e47e370d92659894669dc
MD5 62cb54ffe0ba447c2b4eefbefca59ab6
SHA1 f96865aa57c7f17f196aa6f219ee90726dd3962e
SHA512 4dacd5f17d78f7e551c8867cda3cea1fccdb0dead9ee1a45a5f4496fe71521255db67bc2895328cbf1396a01a831f03f99df2cbd4f1c61227150ac1ff35ffbf9
MD5 SHA1 SHA512

Score

10^/10

buer evasion loader persistence

Malware Config

Extracted

Family

buer

http://loy01.top/
http://loy02.top/
cook5**gjt+,)ojk*
cook5**gjt+-)ojk*

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-1-5-21-2632097139-1792035885-811742494-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\UBlockPlugin\\plugin.exe\""	plugin.exe

Buer Loader 5 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/3292-134-0x000000003F160000-0x000000003F5D6000-memory.dmp	buer
behavioral2/memory/4584-137-0x000000003F310000-0x000000003F786000-memory.dmp	buer
behavioral2/memory/4584-139-0x000000003F310000-0x000000003F786000-memory.dmp	buer
behavioral2/memory/4584-141-0x000000003F310000-0x000000003F786000-memory.dmp	buer
behavioral2/memory/4584-142-0x000000003F310000-0x000000003F786000-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__	415ecf85cc1e03aa1ec4628e4fb918f3a7bcc698604e47e370d92659894669dc.exe

Executes dropped EXE 1 IoCs

pid	Process
4584	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	415ecf85cc1e03aa1ec4628e4fb918f3a7bcc698604e47e370d92659894669dc.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	415ecf85cc1e03aa1ec4628e4fb918f3a7bcc698604e47e370d92659894669dc.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	plugin.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	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-1-5-21-2632097139-1792035885-811742494-1000\Software\Wine	415ecf85cc1e03aa1ec4628e4fb918f3a7bcc698604e47e370d92659894669dc.exe
Key opened	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Software\Wine	plugin.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
3292	415ecf85cc1e03aa1ec4628e4fb918f3a7bcc698604e47e370d92659894669dc.exe
4584	plugin.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4656	1296	WerFault.exe	81

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3292	415ecf85cc1e03aa1ec4628e4fb918f3a7bcc698604e47e370d92659894669dc.exe
3292	415ecf85cc1e03aa1ec4628e4fb918f3a7bcc698604e47e370d92659894669dc.exe
4584	plugin.exe
4584	plugin.exe
4584	plugin.exe
4584	plugin.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3292 wrote to memory of 4584	3292	415ecf85cc1e03aa1ec4628e4fb918f3a7bcc698604e47e370d92659894669dc.exe	80
PID 3292 wrote to memory of 4584	3292	415ecf85cc1e03aa1ec4628e4fb918f3a7bcc698604e47e370d92659894669dc.exe	80
PID 3292 wrote to memory of 4584	3292	415ecf85cc1e03aa1ec4628e4fb918f3a7bcc698604e47e370d92659894669dc.exe	80
PID 4584 wrote to memory of 1296	4584	plugin.exe	81
PID 4584 wrote to memory of 1296	4584	plugin.exe	81
PID 4584 wrote to memory of 1296	4584	plugin.exe	81
PID 4584 wrote to memory of 1296	4584	plugin.exe	81
PID 4584 wrote to memory of 1296	4584	plugin.exe	81
PID 4584 wrote to memory of 1296	4584	plugin.exe	81
PID 4584 wrote to memory of 1296	4584	plugin.exe	81
PID 4584 wrote to memory of 1296	4584	plugin.exe	81
PID 4584 wrote to memory of 1296	4584	plugin.exe	81
PID 4584 wrote to memory of 1296	4584	plugin.exe	81
PID 4584 wrote to memory of 1296	4584	plugin.exe	81
PID 4584 wrote to memory of 1296	4584	plugin.exe	81

C:\Users\Admin\AppData\Local\Temp\415ecf85cc1e03aa1ec4628e4fb918f3a7bcc698604e47e370d92659894669dc.exe
"C:\Users\Admin\AppData\Local\Temp\415ecf85cc1e03aa1ec4628e4fb918f3a7bcc698604e47e370d92659894669dc.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Identifies Wine through registry keys
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:3292
- C:\ProgramData\UBlockPlugin\plugin.exe
  C:\ProgramData\UBlockPlugin\plugin.exe "C:\Users\Admin\AppData\Local\Temp\415ecf85cc1e03aa1ec4628e4fb918f3a7bcc698604e47e370d92659894669dc.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Identifies VirtualBox via ACPI registry values (likely anti-VM)
  - Executes dropped EXE
  - Checks BIOS information in registry
  - Identifies Wine through registry keys
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:4584
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\UBlockPlugin\plugin.exe
    3⤵
    PID:1296
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1296 -s 220
      4⤵
      Program crash
      PID:4656

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 1296 -ip 1296
1⤵
PID:3568

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

plugin.exe

Path C:\ProgramData\UBlockPlugin\plugin.exe
Size 1.8MB
SHA256 415ecf85cc1e03aa1ec4628e4fb918f3a7bcc698604e47e370d92659894669dc
MD5 62cb54ffe0ba447c2b4eefbefca59ab6
SHA1 f96865aa57c7f17f196aa6f219ee90726dd3962e
SHA512 4dacd5f17d78f7e551c8867cda3cea1fccdb0dead9ee1a45a5f4496fe71521255db67bc2895328cbf1396a01a831f03f99df2cbd4f1c61227150ac1ff35ffbf9
SSDEEP 24576:+ZAbigQljq0Pq5NSCts76LIJADoqZ7JVRDC30L8hJnPHdDTKMt4+yhWWLRqfDfsD:DuPqnSh2c49DC3qyJnvN3e5WWLwf
MD5 SHA1 SHA512 SSDEEP

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plugin.exe

Path C:\ProgramData\UBlockPlugin\plugin.exe
Size 1.8MB
SHA256 415ecf85cc1e03aa1ec4628e4fb918f3a7bcc698604e47e370d92659894669dc
MD5 62cb54ffe0ba447c2b4eefbefca59ab6
SHA1 f96865aa57c7f17f196aa6f219ee90726dd3962e
SHA512 4dacd5f17d78f7e551c8867cda3cea1fccdb0dead9ee1a45a5f4496fe71521255db67bc2895328cbf1396a01a831f03f99df2cbd4f1c61227150ac1ff35ffbf9
SSDEEP 24576:+ZAbigQljq0Pq5NSCts76LIJADoqZ7JVRDC30L8hJnPHdDTKMt4+yhWWLRqfDfsD:DuPqnSh2c49DC3qyJnvN3e5WWLwf
MD5 SHA1 SHA512 SSDEEP

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memory/3292-130-0x000000003F160000-0x000000003F5D6000-memory.dmp

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memory/3292-134-0x000000003F160000-0x000000003F5D6000-memory.dmp

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memory/3292-135-0x0000000077660000-0x0000000077803000-memory.dmp

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memory/4584-136-0x0000000077660000-0x0000000077803000-memory.dmp

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memory/4584-137-0x000000003F310000-0x000000003F786000-memory.dmp

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memory/4584-139-0x000000003F310000-0x000000003F786000-memory.dmp

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memory/4584-140-0x0000000077660000-0x0000000077803000-memory.dmp

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memory/4584-141-0x000000003F310000-0x000000003F786000-memory.dmp

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memory/4584-142-0x000000003F310000-0x000000003F786000-memory.dmp

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