buer | 80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa

General

Target

80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exe
Size

2.5MB
MD5

76195dea24952425594e7db7239ce0aa
SHA1

b9791aef3c83751b937f2b60fda094cecb8954a8
SHA256

80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa
SHA512

0cdce90ccffcd69dcf5cc1ff8f0ecfc55f16227b2f6e1141f80c5dfe4dddec71db097755d47715cc59ea4f10ef5c72598eef252f87e923adbac212a27bd90727

Score

10^/10

buer evasion loader persistence themida trojan

Malware Config

Extracted

Family

buer

C2

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

Processes:

errorResponder.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\ErrorResponder\\errorResponder.exe\""	errorResponder.exe

Buer Loader 9 IoCs

Detects Buer loader in memory or disk.

loader

Processes:

resource	yara_rule
behavioral1/memory/1220-55-0x000000003F2A0000-0x000000003F92B000-memory.dmp	buer
behavioral1/memory/1220-56-0x000000003F2A0000-0x000000003F92B000-memory.dmp	buer
behavioral1/memory/1220-57-0x000000003F2A0000-0x000000003F92B000-memory.dmp	buer
behavioral1/memory/1220-58-0x000000003F2A0000-0x000000003F92B000-memory.dmp	buer
behavioral1/memory/1220-60-0x000000003F2A0000-0x000000003F92B000-memory.dmp	buer
behavioral1/memory/1996-67-0x000000003FE00000-0x000000004048B000-memory.dmp	buer
behavioral1/memory/1996-68-0x000000003FE00000-0x000000004048B000-memory.dmp	buer
behavioral1/memory/1996-69-0x000000003FE00000-0x000000004048B000-memory.dmp	buer
behavioral1/memory/1996-71-0x000000003FE00000-0x000000004048B000-memory.dmp	buer

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

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

Processes:

80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exeerrorResponder.exe

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

Processes:

errorResponder.exe

pid process

1996 errorResponder.exe

pid	process
1996	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

Processes:

80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exeerrorResponder.exe

description	ioc	process
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
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exe

Deletes itself 1 IoCs

Processes:

errorResponder.exe

pid process

1996 errorResponder.exe
Loads dropped DLL 1 IoCs

Processes:

80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exe

pid process

1220 80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exe

pid	process
1996	errorResponder.exe

pid	process
1220	80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exe

Themida packer 21 IoCs

Detects Themida, an advanced Windows software protection system.

themida

Processes:

resource	yara_rule
behavioral1/memory/1220-55-0x000000003F2A0000-0x000000003F92B000-memory.dmp	themida
behavioral1/memory/1220-56-0x000000003F2A0000-0x000000003F92B000-memory.dmp	themida
behavioral1/memory/1220-57-0x000000003F2A0000-0x000000003F92B000-memory.dmp	themida
behavioral1/memory/1220-58-0x000000003F2A0000-0x000000003F92B000-memory.dmp	themida
behavioral1/memory/1220-60-0x000000003F2A0000-0x000000003F92B000-memory.dmp	themida
\ProgramData\ErrorResponder\errorResponder.exe	themida
C:\ProgramData\ErrorResponder\errorResponder.exe	themida
behavioral1/memory/1996-66-0x000000003FE00000-0x000000004048B000-memory.dmp	themida
behavioral1/memory/1996-67-0x000000003FE00000-0x000000004048B000-memory.dmp	themida
behavioral1/memory/1996-68-0x000000003FE00000-0x000000004048B000-memory.dmp	themida
behavioral1/memory/1996-69-0x000000003FE00000-0x000000004048B000-memory.dmp	themida
C:\ProgramData\ErrorResponder\errorResponder.exe	themida
behavioral1/memory/1996-71-0x000000003FE00000-0x000000004048B000-memory.dmp	themida
behavioral1/memory/1368-73-0x00000000003B0000-0x0000000000A3B000-memory.dmp	themida
behavioral1/memory/1368-75-0x00000000003B0000-0x0000000000A3B000-memory.dmp	themida
behavioral1/memory/1368-76-0x00000000003B0000-0x0000000000A3B000-memory.dmp	themida
behavioral1/memory/1368-77-0x00000000003B0000-0x0000000000A3B000-memory.dmp	themida
behavioral1/memory/1368-78-0x00000000003B0000-0x0000000000A3B000-memory.dmp	themida
behavioral1/memory/1368-80-0x00000000003B0000-0x0000000000A3B000-memory.dmp	themida
behavioral1/memory/1368-81-0x00000000003B0000-0x0000000000A3B000-memory.dmp	themida
behavioral1/memory/1368-83-0x00000000003B0000-0x0000000000A3B000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 2 IoCs

evasion trojan

System Information Discovery

T1082

Processes:

80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exeerrorResponder.exe

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

Processes:

80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exeerrorResponder.exe

pid process

1220 80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exe
1996 errorResponder.exe
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

864 1368 WerFault.exe secinit.exe
Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

errorResponder.exe

pid process

1996 errorResponder.exe

pid	process
1220	80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exe
1996	errorResponder.exe

pid	pid_target	process	target process
864	1368	WerFault.exe	secinit.exe

pid	process
1996	errorResponder.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exeerrorResponder.exesecinit.exe

description	pid	process	target process
PID 1220 wrote to memory of 1996	1220	80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exe	errorResponder.exe
PID 1220 wrote to memory of 1996	1220	80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exe	errorResponder.exe
PID 1220 wrote to memory of 1996	1220	80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exe	errorResponder.exe
PID 1220 wrote to memory of 1996	1220	80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa.exe	errorResponder.exe
PID 1996 wrote to memory of 1368	1996	errorResponder.exe	secinit.exe
PID 1996 wrote to memory of 1368	1996	errorResponder.exe	secinit.exe
PID 1996 wrote to memory of 1368	1996	errorResponder.exe	secinit.exe
PID 1996 wrote to memory of 1368	1996	errorResponder.exe	secinit.exe
PID 1996 wrote to memory of 1368	1996	errorResponder.exe	secinit.exe
PID 1996 wrote to memory of 1368	1996	errorResponder.exe	secinit.exe
PID 1996 wrote to memory of 1368	1996	errorResponder.exe	secinit.exe
PID 1996 wrote to memory of 1368	1996	errorResponder.exe	secinit.exe
PID 1996 wrote to memory of 1368	1996	errorResponder.exe	secinit.exe
PID 1996 wrote to memory of 1368	1996	errorResponder.exe	secinit.exe
PID 1996 wrote to memory of 1368	1996	errorResponder.exe	secinit.exe
PID 1996 wrote to memory of 1368	1996	errorResponder.exe	secinit.exe
PID 1996 wrote to memory of 1368	1996	errorResponder.exe	secinit.exe
PID 1996 wrote to memory of 1368	1996	errorResponder.exe	secinit.exe
PID 1996 wrote to memory of 1368	1996	errorResponder.exe	secinit.exe
PID 1368 wrote to memory of 864	1368	secinit.exe	WerFault.exe
PID 1368 wrote to memory of 864	1368	secinit.exe	WerFault.exe
PID 1368 wrote to memory of 864	1368	secinit.exe	WerFault.exe
PID 1368 wrote to memory of 864	1368	secinit.exe	WerFault.exe

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
- Loads dropped DLL
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of WriteProcessMemory
PID:1220

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
- Deletes itself
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1996

C:\Windows\SysWOW64\secinit.exe
C:\ProgramData\ErrorResponder\errorResponder.exe
3⤵
- Suspicious use of WriteProcessMemory
PID:1368

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1368 -s 136
4⤵
- Program crash
PID:864

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

1

T1004

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Virtualization/Sandbox Evasion

1

T1497

Credential Access

Discovery

Query Registry

2

T1012

Virtualization/Sandbox Evasion

1

T1497

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\ProgramData\ErrorResponder\errorResponder.exe
Filesize
2.5MB

MD5
76195dea24952425594e7db7239ce0aa

SHA1
b9791aef3c83751b937f2b60fda094cecb8954a8

SHA256
80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa

SHA512
0cdce90ccffcd69dcf5cc1ff8f0ecfc55f16227b2f6e1141f80c5dfe4dddec71db097755d47715cc59ea4f10ef5c72598eef252f87e923adbac212a27bd90727

Download Submit
C:\ProgramData\ErrorResponder\errorResponder.exe
Filesize
2.5MB

MD5
76195dea24952425594e7db7239ce0aa

SHA1
b9791aef3c83751b937f2b60fda094cecb8954a8

SHA256
80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa

SHA512
0cdce90ccffcd69dcf5cc1ff8f0ecfc55f16227b2f6e1141f80c5dfe4dddec71db097755d47715cc59ea4f10ef5c72598eef252f87e923adbac212a27bd90727

Download Submit
\ProgramData\ErrorResponder\errorResponder.exe
Filesize
2.5MB

MD5
76195dea24952425594e7db7239ce0aa

SHA1
b9791aef3c83751b937f2b60fda094cecb8954a8

SHA256
80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa

SHA512
0cdce90ccffcd69dcf5cc1ff8f0ecfc55f16227b2f6e1141f80c5dfe4dddec71db097755d47715cc59ea4f10ef5c72598eef252f87e923adbac212a27bd90727

Download Submit
memory/864-88-0x0000000000000000-mapping.dmp

Download
memory/1220-55-0x000000003F2A0000-0x000000003F92B000-memory.dmp

Filesize
6.5MB

Download
memory/1220-56-0x000000003F2A0000-0x000000003F92B000-memory.dmp

Filesize
6.5MB

Download
memory/1220-57-0x000000003F2A0000-0x000000003F92B000-memory.dmp

Filesize
6.5MB

Download
memory/1220-59-0x0000000077DC0000-0x0000000077F40000-memory.dmp

Filesize
1.5MB

Download
memory/1220-58-0x000000003F2A0000-0x000000003F92B000-memory.dmp

Filesize
6.5MB

Download
memory/1220-60-0x000000003F2A0000-0x000000003F92B000-memory.dmp

Filesize
6.5MB

Download
memory/1220-64-0x0000000077DC0000-0x0000000077F40000-memory.dmp

Filesize
1.5MB

Download
memory/1220-54-0x0000000076011000-0x0000000076013000-memory.dmp

Filesize
8KB

Download
memory/1368-77-0x00000000003B0000-0x0000000000A3B000-memory.dmp

Filesize
6.5MB

Download
memory/1368-83-0x00000000003B0000-0x0000000000A3B000-memory.dmp

Filesize
6.5MB

Download
memory/1368-87-0x0000000000000000-mapping.dmp

Download
memory/1368-85-0x0000000000080000-0x0000000000081000-memory.dmp

Filesize
4KB

Download
memory/1368-81-0x00000000003B0000-0x0000000000A3B000-memory.dmp

Filesize
6.5MB

Download
memory/1368-72-0x00000000003B0000-0x0000000000A3B000-memory.dmp

Filesize
6.5MB

Download
memory/1368-73-0x00000000003B0000-0x0000000000A3B000-memory.dmp

Filesize
6.5MB

Download
memory/1368-75-0x00000000003B0000-0x0000000000A3B000-memory.dmp

Filesize
6.5MB

Download
memory/1368-76-0x00000000003B0000-0x0000000000A3B000-memory.dmp

Filesize
6.5MB

Download
memory/1368-80-0x00000000003B0000-0x0000000000A3B000-memory.dmp

Filesize
6.5MB

Download
memory/1368-78-0x00000000003B0000-0x0000000000A3B000-memory.dmp

Filesize
6.5MB

Download
memory/1996-66-0x000000003FE00000-0x000000004048B000-memory.dmp

Filesize
6.5MB

Download
memory/1996-71-0x000000003FE00000-0x000000004048B000-memory.dmp

Filesize
6.5MB

Download
memory/1996-68-0x000000003FE00000-0x000000004048B000-memory.dmp

Filesize
6.5MB

Download
memory/1996-67-0x000000003FE00000-0x000000004048B000-memory.dmp

Filesize
6.5MB

Download
memory/1996-69-0x000000003FE00000-0x000000004048B000-memory.dmp

Filesize
6.5MB

Download
memory/1996-62-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads