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

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-330940541-141609230-1670313778-1000\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

resource	yara_rule
behavioral1/memory/2008-2-0x000000003FB80000-0x000000004020B000-memory.dmp	buer
behavioral1/memory/2008-3-0x000000003FB80000-0x000000004020B000-memory.dmp	buer
behavioral1/memory/2008-4-0x000000003FB80000-0x000000004020B000-memory.dmp	buer
behavioral1/memory/2008-5-0x000000003FB80000-0x000000004020B000-memory.dmp	buer
behavioral1/memory/2644-18-0x000000003F230000-0x000000003F8BB000-memory.dmp	buer
behavioral1/memory/2644-19-0x000000003F230000-0x000000003F8BB000-memory.dmp	buer
behavioral1/memory/2644-20-0x000000003F230000-0x000000003F8BB000-memory.dmp	buer
behavioral1/memory/2644-21-0x000000003F230000-0x000000003F8BB000-memory.dmp	buer
behavioral1/memory/2644-28-0x000000003F230000-0x000000003F8BB000-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__	76195dea24952425594e7db7239ce0aa_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	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	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

pid	Process
2644	errorResponder.exe

Executes dropped EXE 1 IoCs

pid	Process
2644	errorResponder.exe

Loads dropped DLL 1 IoCs

pid	Process
2008	76195dea24952425594e7db7239ce0aa_JaffaCakes118.exe

Themida packer 12 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral1/memory/2008-0-0x000000003FB80000-0x000000004020B000-memory.dmp	themida
behavioral1/memory/2008-2-0x000000003FB80000-0x000000004020B000-memory.dmp	themida
behavioral1/memory/2008-3-0x000000003FB80000-0x000000004020B000-memory.dmp	themida
behavioral1/memory/2008-4-0x000000003FB80000-0x000000004020B000-memory.dmp	themida
behavioral1/memory/2008-5-0x000000003FB80000-0x000000004020B000-memory.dmp	themida
behavioral1/files/0x000f00000000f680-11.dat	themida
behavioral1/memory/2644-17-0x000000003F230000-0x000000003F8BB000-memory.dmp	themida
behavioral1/memory/2644-18-0x000000003F230000-0x000000003F8BB000-memory.dmp	themida
behavioral1/memory/2644-19-0x000000003F230000-0x000000003F8BB000-memory.dmp	themida
behavioral1/memory/2644-20-0x000000003F230000-0x000000003F8BB000-memory.dmp	themida
behavioral1/memory/2644-21-0x000000003F230000-0x000000003F8BB000-memory.dmp	themida
behavioral1/memory/2644-28-0x000000003F230000-0x000000003F8BB000-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	76195dea24952425594e7db7239ce0aa_JaffaCakes118.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	errorResponder.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2008	76195dea24952425594e7db7239ce0aa_JaffaCakes118.exe
2644	errorResponder.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2644	errorResponder.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 2008 wrote to memory of 2644	2008	76195dea24952425594e7db7239ce0aa_JaffaCakes118.exe	30
PID 2008 wrote to memory of 2644	2008	76195dea24952425594e7db7239ce0aa_JaffaCakes118.exe	30
PID 2008 wrote to memory of 2644	2008	76195dea24952425594e7db7239ce0aa_JaffaCakes118.exe	30
PID 2008 wrote to memory of 2644	2008	76195dea24952425594e7db7239ce0aa_JaffaCakes118.exe	30
PID 2644 wrote to memory of 2624	2644	errorResponder.exe	31
PID 2644 wrote to memory of 2624	2644	errorResponder.exe	31
PID 2644 wrote to memory of 2624	2644	errorResponder.exe	31
PID 2644 wrote to memory of 2624	2644	errorResponder.exe	31

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
- Loads dropped DLL
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of WriteProcessMemory
PID:2008
- 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:2644
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\ErrorResponder\errorResponder.exe
    3⤵
    PID:2624

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

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

System Information Discovery

2

T1082

Virtualization/Sandbox Evasion

1

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

\ProgramData\ErrorResponder\errorResponder.exe

Filesize
2.5MB

MD5
76195dea24952425594e7db7239ce0aa

SHA1
b9791aef3c83751b937f2b60fda094cecb8954a8

SHA256
80e35297452f56d53068cfaa87d95cbb9af7f5a44c9db7b0a84f4a8ff83ebdaa

SHA512
0cdce90ccffcd69dcf5cc1ff8f0ecfc55f16227b2f6e1141f80c5dfe4dddec71db097755d47715cc59ea4f10ef5c72598eef252f87e923adbac212a27bd90727

Download Submit
memory/2008-3-0x000000003FB80000-0x000000004020B000-memory.dmp

Filesize
6.5MB

Download
memory/2008-2-0x000000003FB80000-0x000000004020B000-memory.dmp

Filesize
6.5MB

Download
memory/2008-0-0x000000003FB80000-0x000000004020B000-memory.dmp

Filesize
6.5MB

Download
memory/2008-4-0x000000003FB80000-0x000000004020B000-memory.dmp

Filesize
6.5MB

Download
memory/2008-5-0x000000003FB80000-0x000000004020B000-memory.dmp

Filesize
6.5MB

Download
memory/2008-1-0x0000000077D10000-0x0000000077D12000-memory.dmp

Filesize
8KB

Download
memory/2644-17-0x000000003F230000-0x000000003F8BB000-memory.dmp

Filesize
6.5MB

Download
memory/2644-18-0x000000003F230000-0x000000003F8BB000-memory.dmp

Filesize
6.5MB

Download
memory/2644-19-0x000000003F230000-0x000000003F8BB000-memory.dmp

Filesize
6.5MB

Download
memory/2644-20-0x000000003F230000-0x000000003F8BB000-memory.dmp

Filesize
6.5MB

Download
memory/2644-21-0x000000003F230000-0x000000003F8BB000-memory.dmp

Filesize
6.5MB

Download
memory/2644-28-0x000000003F230000-0x000000003F8BB000-memory.dmp

Filesize
6.5MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads