buer | 80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa

General

Target

76195dea24952425594e7db7239ce0aa_JaffaCakes118.exe
Size

2.5MB
MD5

76195dea24952425594e7db7239ce0aa
SHA1

b9791aef3c83751b937f2b60fda094cecb8954a8
SHA256

80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa
SHA512

0cdce90ccffcd69dcf5cc1ff8f0ecfc55f16227b2f6e1141f80c5dfe4dddec71db097755d47715cc59ea4f10ef5c72598eef252f87e923adbac212a27bd90727
SSDEEP

49152:WNx808T9CKJc5FwOTL6Xz0KlMJ+6NLptQx2UbdMM5Y2LWz:W4d9HxQuXzzMJ+65L12Lc

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

T1547.004

Modify Registry

T1112

Processes:

errorResponder.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000\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

Processes:

resource	yara_rule
behavioral2/memory/4668-3-0x000000003F8C0000-0x000000003FF4B000-memory.dmp	buer
behavioral2/memory/4668-2-0x000000003F8C0000-0x000000003FF4B000-memory.dmp	buer
behavioral2/memory/4668-4-0x000000003F8C0000-0x000000003FF4B000-memory.dmp	buer
behavioral2/memory/4668-5-0x000000003F8C0000-0x000000003FF4B000-memory.dmp	buer
behavioral2/memory/2360-16-0x000000003FEA0000-0x000000004052B000-memory.dmp	buer
behavioral2/memory/2360-17-0x000000003FEA0000-0x000000004052B000-memory.dmp	buer
behavioral2/memory/2360-18-0x000000003FEA0000-0x000000004052B000-memory.dmp	buer
behavioral2/memory/2360-19-0x000000003FEA0000-0x000000004052B000-memory.dmp	buer
behavioral2/memory/2360-25-0x000000003FEA0000-0x000000004052B000-memory.dmp	buer
behavioral2/memory/2360-27-0x000000003FEA0000-0x000000004052B000-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:

errorResponder.exe76195dea24952425594e7db7239ce0aa_JaffaCakes118.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	errorResponder.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	76195dea24952425594e7db7239ce0aa_JaffaCakes118.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:

76195dea24952425594e7db7239ce0aa_JaffaCakes118.exeerrorResponder.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	76195dea24952425594e7db7239ce0aa_JaffaCakes118.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	76195dea24952425594e7db7239ce0aa_JaffaCakes118.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	errorResponder.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	errorResponder.exe

Deletes itself 1 IoCs

Processes:

errorResponder.exe

pid process

2360 errorResponder.exe
Executes dropped EXE 1 IoCs

Processes:

errorResponder.exe

pid process

2360 errorResponder.exe

pid	process
2360	errorResponder.exe

pid	process
2360	errorResponder.exe

Themida packer 13 IoCs

Detects Themida, an advanced Windows software protection system.

themida

Processes:

resource	yara_rule
behavioral2/memory/4668-0-0x000000003F8C0000-0x000000003FF4B000-memory.dmp	themida
behavioral2/memory/4668-3-0x000000003F8C0000-0x000000003FF4B000-memory.dmp	themida
behavioral2/memory/4668-2-0x000000003F8C0000-0x000000003FF4B000-memory.dmp	themida
behavioral2/memory/4668-4-0x000000003F8C0000-0x000000003FF4B000-memory.dmp	themida
behavioral2/memory/4668-5-0x000000003F8C0000-0x000000003FF4B000-memory.dmp	themida
C:\ProgramData\ErrorResponder\errorResponder.exe	themida
behavioral2/memory/2360-15-0x000000003FEA0000-0x000000004052B000-memory.dmp	themida
behavioral2/memory/2360-16-0x000000003FEA0000-0x000000004052B000-memory.dmp	themida
behavioral2/memory/2360-17-0x000000003FEA0000-0x000000004052B000-memory.dmp	themida
behavioral2/memory/2360-18-0x000000003FEA0000-0x000000004052B000-memory.dmp	themida
behavioral2/memory/2360-19-0x000000003FEA0000-0x000000004052B000-memory.dmp	themida
behavioral2/memory/2360-25-0x000000003FEA0000-0x000000004052B000-memory.dmp	themida
behavioral2/memory/2360-27-0x000000003FEA0000-0x000000004052B000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 2 IoCs

evasion trojan

System Information Discovery

T1082

Processes:

76195dea24952425594e7db7239ce0aa_JaffaCakes118.exeerrorResponder.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	76195dea24952425594e7db7239ce0aa_JaffaCakes118.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	errorResponder.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

76195dea24952425594e7db7239ce0aa_JaffaCakes118.exeerrorResponder.exe

pid process

4668 76195dea24952425594e7db7239ce0aa_JaffaCakes118.exe
2360 errorResponder.exe
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

4960 2088 WerFault.exe secinit.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

errorResponder.exe

pid process

2360 errorResponder.exe
2360 errorResponder.exe

pid	process
4668	76195dea24952425594e7db7239ce0aa_JaffaCakes118.exe
2360	errorResponder.exe

pid	pid_target	process	target process
4960	2088	WerFault.exe	secinit.exe

pid	process
2360	errorResponder.exe
2360	errorResponder.exe

Suspicious use of WriteProcessMemory 17 IoCs

Processes:

76195dea24952425594e7db7239ce0aa_JaffaCakes118.exeerrorResponder.exe

description	pid	process	target process
PID 4668 wrote to memory of 2360	4668	76195dea24952425594e7db7239ce0aa_JaffaCakes118.exe	errorResponder.exe
PID 4668 wrote to memory of 2360	4668	76195dea24952425594e7db7239ce0aa_JaffaCakes118.exe	errorResponder.exe
PID 4668 wrote to memory of 2360	4668	76195dea24952425594e7db7239ce0aa_JaffaCakes118.exe	errorResponder.exe
PID 2360 wrote to memory of 2088	2360	errorResponder.exe	secinit.exe
PID 2360 wrote to memory of 2088	2360	errorResponder.exe	secinit.exe
PID 2360 wrote to memory of 2088	2360	errorResponder.exe	secinit.exe
PID 2360 wrote to memory of 2088	2360	errorResponder.exe	secinit.exe
PID 2360 wrote to memory of 2088	2360	errorResponder.exe	secinit.exe
PID 2360 wrote to memory of 2088	2360	errorResponder.exe	secinit.exe
PID 2360 wrote to memory of 2088	2360	errorResponder.exe	secinit.exe
PID 2360 wrote to memory of 2088	2360	errorResponder.exe	secinit.exe
PID 2360 wrote to memory of 2088	2360	errorResponder.exe	secinit.exe
PID 2360 wrote to memory of 2088	2360	errorResponder.exe	secinit.exe
PID 2360 wrote to memory of 2088	2360	errorResponder.exe	secinit.exe
PID 2360 wrote to memory of 2088	2360	errorResponder.exe	secinit.exe
PID 2360 wrote to memory of 2088	2360	errorResponder.exe	secinit.exe
PID 2360 wrote to memory of 2088	2360	errorResponder.exe	secinit.exe

C:\Users\Admin\AppData\Local\Temp\76195dea24952425594e7db7239ce0aa_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\76195dea24952425594e7db7239ce0aa_JaffaCakes118.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:4668

C:\ProgramData\ErrorResponder\errorResponder.exe
C:\ProgramData\ErrorResponder\errorResponder.exe "C:\Users\Admin\AppData\Local\Temp\76195dea24952425594e7db7239ce0aa_JaffaCakes118.exe" ensgJJ
2⤵
- Modifies WinLogon for persistence
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Deletes itself
- Executes dropped EXE
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2360

C:\Windows\SysWOW64\secinit.exe
C:\ProgramData\ErrorResponder\errorResponder.exe
3⤵
PID:2088

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2088 -s 244
4⤵
- Program crash
PID:4960

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 376 -p 2088 -ip 2088
1⤵
PID:1512

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

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

Resource Development

Reconnaissance

Replay Monitor

Loading Replay Monitor...

Downloads

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

MD5
76195dea24952425594e7db7239ce0aa

SHA1
b9791aef3c83751b937f2b60fda094cecb8954a8

SHA256
80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa

SHA512
0cdce90ccffcd69dcf5cc1ff8f0ecfc55f16227b2f6e1141f80c5dfe4dddec71db097755d47715cc59ea4f10ef5c72598eef252f87e923adbac212a27bd90727

Download Submit
memory/2088-24-0x0000000000370000-0x0000000000371000-memory.dmp

Filesize
4KB

Download
memory/2360-17-0x000000003FEA0000-0x000000004052B000-memory.dmp

Filesize
6.5MB

Download
memory/2360-15-0x000000003FEA0000-0x000000004052B000-memory.dmp

Filesize
6.5MB

Download
memory/2360-16-0x000000003FEA0000-0x000000004052B000-memory.dmp

Filesize
6.5MB

Download
memory/2360-18-0x000000003FEA0000-0x000000004052B000-memory.dmp

Filesize
6.5MB

Download
memory/2360-19-0x000000003FEA0000-0x000000004052B000-memory.dmp

Filesize
6.5MB

Download
memory/2360-25-0x000000003FEA0000-0x000000004052B000-memory.dmp

Filesize
6.5MB

Download
memory/2360-27-0x000000003FEA0000-0x000000004052B000-memory.dmp

Filesize
6.5MB

Download
memory/4668-2-0x000000003F8C0000-0x000000003FF4B000-memory.dmp

Filesize
6.5MB

Download
memory/4668-4-0x000000003F8C0000-0x000000003FF4B000-memory.dmp

Filesize
6.5MB

Download
memory/4668-5-0x000000003F8C0000-0x000000003FF4B000-memory.dmp

Filesize
6.5MB

Download
memory/4668-3-0x000000003F8C0000-0x000000003FF4B000-memory.dmp

Filesize
6.5MB

Download
memory/4668-1-0x0000000077394000-0x0000000077396000-memory.dmp

Filesize
8KB

Download
memory/4668-0-0x000000003F8C0000-0x000000003FF4B000-memory.dmp

Filesize
6.5MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

Replay Monitor

Loading Replay Monitor...

Downloads