buer | 80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa

Analysis

max time kernel
201s
max time network
249s
platform
windows10-2004_x64
resource
win10v2004-20220414-en
submitted
25/06/2022, 02:21

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General

Target
80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exe
Size 2.5MB
Sample220625-cs49gsaear
SHA256 80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa
MD5 76195dea24952425594e7db7239ce0aa
SHA1 b9791aef3c83751b937f2b60fda094cecb8954a8
SHA512 0cdce90ccffcd69dcf5cc1ff8f0ecfc55f16227b2f6e1141f80c5dfe4dddec71db097755d47715cc59ea4f10ef5c72598eef252f87e923adbac212a27bd90727
MD5 SHA1 SHA512

Score

10^/10

buer evasion loader persistence themida trojan

Malware Config

Extracted

Family

buer

http://burload01.top/
http://burload02.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-1-5-21-3751123196-3323558407-1869646069-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\ErrorResponder\\errorResponder.exe\""	errorResponder.exe

Buer Loader 10 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/4024-130-0x000000003F150000-0x000000003F7DB000-memory.dmp	buer
behavioral2/memory/4024-131-0x000000003F150000-0x000000003F7DB000-memory.dmp	buer
behavioral2/memory/4024-132-0x000000003F150000-0x000000003F7DB000-memory.dmp	buer
behavioral2/memory/4024-133-0x000000003F150000-0x000000003F7DB000-memory.dmp	buer
behavioral2/memory/4024-135-0x000000003F150000-0x000000003F7DB000-memory.dmp	buer
behavioral2/memory/2124-141-0x000000003F920000-0x000000003FFAB000-memory.dmp	buer
behavioral2/memory/2124-140-0x000000003F920000-0x000000003FFAB000-memory.dmp	buer
behavioral2/memory/2124-142-0x000000003F920000-0x000000003FFAB000-memory.dmp	buer
behavioral2/memory/2124-143-0x000000003F920000-0x000000003FFAB000-memory.dmp	buer
behavioral2/memory/2124-146-0x000000003F920000-0x000000003FFAB000-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__	80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	errorResponder.exe

Executes dropped EXE 1 IoCs

pid	Process
2124	errorResponder.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	80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	errorResponder.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	errorResponder.exe

Themida packer 12 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral2/memory/4024-130-0x000000003F150000-0x000000003F7DB000-memory.dmp	themida
behavioral2/memory/4024-131-0x000000003F150000-0x000000003F7DB000-memory.dmp	themida
behavioral2/memory/4024-132-0x000000003F150000-0x000000003F7DB000-memory.dmp	themida
behavioral2/memory/4024-133-0x000000003F150000-0x000000003F7DB000-memory.dmp	themida
behavioral2/memory/4024-135-0x000000003F150000-0x000000003F7DB000-memory.dmp	themida
behavioral2/files/0x00060000000231f2-138.dat	themida
behavioral2/files/0x00060000000231f2-139.dat	themida
behavioral2/memory/2124-141-0x000000003F920000-0x000000003FFAB000-memory.dmp	themida
behavioral2/memory/2124-140-0x000000003F920000-0x000000003FFAB000-memory.dmp	themida
behavioral2/memory/2124-142-0x000000003F920000-0x000000003FFAB000-memory.dmp	themida
behavioral2/memory/2124-143-0x000000003F920000-0x000000003FFAB000-memory.dmp	themida
behavioral2/memory/2124-146-0x000000003F920000-0x000000003FFAB000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 2 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	errorResponder.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
4024	80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exe
2124	errorResponder.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 4024 wrote to memory of 2124	4024	80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exe	87
PID 4024 wrote to memory of 2124	4024	80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exe	87
PID 4024 wrote to memory of 2124	4024	80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exe	87
PID 2124 wrote to memory of 4780	2124	errorResponder.exe	88
PID 2124 wrote to memory of 4780	2124	errorResponder.exe	88
PID 2124 wrote to memory of 4780	2124	errorResponder.exe	88
PID 2124 wrote to memory of 4780	2124	errorResponder.exe	88
PID 2124 wrote to memory of 4780	2124	errorResponder.exe	88
PID 2124 wrote to memory of 4780	2124	errorResponder.exe	88
PID 2124 wrote to memory of 4780	2124	errorResponder.exe	88
PID 2124 wrote to memory of 4780	2124	errorResponder.exe	88
PID 2124 wrote to memory of 4780	2124	errorResponder.exe	88
PID 2124 wrote to memory of 4780	2124	errorResponder.exe	88
PID 2124 wrote to memory of 4780	2124	errorResponder.exe	88
PID 2124 wrote to memory of 4780	2124	errorResponder.exe	88
PID 2124 wrote to memory of 4780	2124	errorResponder.exe	88
PID 2124 wrote to memory of 4780	2124	errorResponder.exe	88

C:\Users\Admin\AppData\Local\Temp\80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exe
"C:\Users\Admin\AppData\Local\Temp\80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of WriteProcessMemory
PID:4024
- C:\ProgramData\ErrorResponder\errorResponder.exe
  C:\ProgramData\ErrorResponder\errorResponder.exe "C:\Users\Admin\AppData\Local\Temp\80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Identifies VirtualBox via ACPI registry values (likely anti-VM)
  - Executes dropped EXE
  - Checks BIOS information in registry
  - Checks whether UAC is enabled
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious use of WriteProcessMemory
  PID:2124
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\ErrorResponder\errorResponder.exe
    3⤵
    PID:4780

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

errorResponder.exe

Path C:\ProgramData\ErrorResponder\errorResponder.exe
Size 2.5MB
SHA256 80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa
MD5 76195dea24952425594e7db7239ce0aa
SHA1 b9791aef3c83751b937f2b60fda094cecb8954a8
SHA512 0cdce90ccffcd69dcf5cc1ff8f0ecfc55f16227b2f6e1141f80c5dfe4dddec71db097755d47715cc59ea4f10ef5c72598eef252f87e923adbac212a27bd90727
SSDEEP 49152:WNx808T9CKJc5FwOTL6Xz0KlMJ+6NLptQx2UbdMM5Y2LWz:W4d9HxQuXzzMJ+65L12Lc
MD5 SHA1 SHA512 SSDEEP

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errorResponder.exe

Path C:\ProgramData\ErrorResponder\errorResponder.exe
Size 2.5MB
SHA256 80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa
MD5 76195dea24952425594e7db7239ce0aa
SHA1 b9791aef3c83751b937f2b60fda094cecb8954a8
SHA512 0cdce90ccffcd69dcf5cc1ff8f0ecfc55f16227b2f6e1141f80c5dfe4dddec71db097755d47715cc59ea4f10ef5c72598eef252f87e923adbac212a27bd90727
SSDEEP 49152:WNx808T9CKJc5FwOTL6Xz0KlMJ+6NLptQx2UbdMM5Y2LWz:W4d9HxQuXzzMJ+65L12Lc
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/2124-142-0x000000003F920000-0x000000003FFAB000-memory.dmp

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memory/2124-140-0x000000003F920000-0x000000003FFAB000-memory.dmp

Download

memory/2124-147-0x0000000076F60000-0x0000000077103000-memory.dmp

Download

memory/2124-146-0x000000003F920000-0x000000003FFAB000-memory.dmp

Download

memory/2124-144-0x0000000076F60000-0x0000000077103000-memory.dmp

Download

memory/2124-143-0x000000003F920000-0x000000003FFAB000-memory.dmp

Download

memory/2124-141-0x000000003F920000-0x000000003FFAB000-memory.dmp

Download

memory/4024-131-0x000000003F150000-0x000000003F7DB000-memory.dmp

Download

memory/4024-133-0x000000003F150000-0x000000003F7DB000-memory.dmp

Download

memory/4024-130-0x000000003F150000-0x000000003F7DB000-memory.dmp

Download

memory/4024-132-0x000000003F150000-0x000000003F7DB000-memory.dmp

Download

memory/4024-136-0x0000000076F60000-0x0000000077103000-memory.dmp

Download

memory/4024-145-0x0000000076F60000-0x0000000077103000-memory.dmp

Download

memory/4024-135-0x000000003F150000-0x000000003F7DB000-memory.dmp

Download

memory/4024-134-0x0000000076F60000-0x0000000077103000-memory.dmp

Download

Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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