bumblebee | 7b16d288c77688f617ac39cda69d397f7fe6e87172514f76d3ac1e2623dc41bd

Analysis

max time kernel
101s
max time network
140s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
24-10-2022 09:59

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General

Target

a1ec21eda64e0a6edc5f16978c6b752c66f4338a9d750fa246c7344a8c76ad90.xlsb
Size

208KB
MD5

b8c86fdc6fc2479498b92d474021d8c5
SHA1

8256aed96aa28b8d80956d5022bf5ada15218927
SHA256

a1ec21eda64e0a6edc5f16978c6b752c66f4338a9d750fa246c7344a8c76ad90
SHA512

2e4f21d5675bf7ee2b1edc3af51afff3d48ba2288f863e5c5ab3412494495eeafbb4c8e5fa53688c784fdd9ae110d445158b56dc831f9128012dd99f9b5e1f8f
SSDEEP

6144:CehHpGTRt0hgI/qm1Uz/SyQI9dTbmeo70uWoeJJggmA8:CehHYRt0Wax1ASrWfJaZA8

Score

10^/10

bumblebee 2010m evasion trojan

Malware Config

Extracted

Language

xlm4.0

Source

Extracted

Family

bumblebee

Botnet

2010m

23.106.160.112:443

146.59.116.146:443

172.93.193.220:443

rc4.plain

Signatures

BumbleBee
BumbleBee is a webshell malware written in C++.
trojan bumblebee

Process spawned unexpected child process 2 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

description	pid	pid_target	Process	procid_target
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3536	3132	regsvr32.exe	82
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	2716	3132	regsvr32.exe	82

Enumerates VirtualBox registry keys 2 TTPs 5 IoCs

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\VBoxGuest	regsvr32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\VBoxMouse	regsvr32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\VBoxService	regsvr32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\VBoxSF	regsvr32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\VBoxVideo	regsvr32.exe

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 3 IoCs

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	regsvr32.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\FADT\VBOX__	regsvr32.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\RSDT\VBOX__	regsvr32.exe

Looks for VirtualBox Guest Additions in registry 2 TTPs 1 IoCs

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\Oracle\VirtualBox Guest Additions	regsvr32.exe

Downloads MZ/PE file

Checks BIOS information in registry 2 TTPs 3 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	regsvr32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	regsvr32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate	regsvr32.exe

Identifies Wine through registry keys 2 TTPs 1 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-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Wine	regsvr32.exe

Loads dropped DLL 1 IoCs

pid	Process
2716	regsvr32.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
2716	regsvr32.exe

Checks processor information in registry 2 TTPs 3 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	EXCEL.EXE

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
3132	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe
2716	regsvr32.exe

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
3132	EXCEL.EXE
3132	EXCEL.EXE
3132	EXCEL.EXE
3132	EXCEL.EXE
3132	EXCEL.EXE
3132	EXCEL.EXE
3132	EXCEL.EXE
3132	EXCEL.EXE
3132	EXCEL.EXE
3132	EXCEL.EXE
3132	EXCEL.EXE
3132	EXCEL.EXE

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3132 wrote to memory of 3536	3132	EXCEL.EXE	89
PID 3132 wrote to memory of 3536	3132	EXCEL.EXE	89
PID 3132 wrote to memory of 2716	3132	EXCEL.EXE	90
PID 3132 wrote to memory of 2716	3132	EXCEL.EXE	90

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\a1ec21eda64e0a6edc5f16978c6b752c66f4338a9d750fa246c7344a8c76ad90.xlsb"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3132
- C:\Windows\SYSTEM32\regsvr32.exe
  regsvr32 /s calc
  2⤵
  - Process spawned unexpected child process
  PID:3536
- C:\Windows\SYSTEM32\regsvr32.exe
  regsvr32 C:\Kepofad\Jdvidasja\Fuelavrb.dll
  2⤵
  - Process spawned unexpected child process
  - Enumerates VirtualBox registry keys
  - Identifies VirtualBox via ACPI registry values (likely anti-VM)
  - Looks for VirtualBox Guest Additions in registry
  - Checks BIOS information in registry
  - Identifies Wine through registry keys
  - Loads dropped DLL
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious behavior: EnumeratesProcesses
  PID:2716

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

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

C:\Kepofad\Jdvidasja\Fuelavrb.dll

Filesize
3.6MB

MD5
1e97fac877fd16aa937bdc35714cc058

SHA1
ef7687fd12df2a102e443a9cfa6c09a1f16b0035

SHA256
ddb9895f9e74d3e7db4e94aa77338fdc221ed29f29857a9752545cddcf8f45a6

SHA512
3d62557bfa3903b59275a0d9ff910e4382a4d574d7d27d1c23d9755368b735ac3be2f49f7021816051cf85a92e913cb5b7d4b3cafe8aded0e602900875caba90

Download Submit
C:\Kepofad\Jdvidasja\Fuelavrb.dll

Filesize
3.6MB

MD5
1e97fac877fd16aa937bdc35714cc058

SHA1
ef7687fd12df2a102e443a9cfa6c09a1f16b0035

SHA256
ddb9895f9e74d3e7db4e94aa77338fdc221ed29f29857a9752545cddcf8f45a6

SHA512
3d62557bfa3903b59275a0d9ff910e4382a4d574d7d27d1c23d9755368b735ac3be2f49f7021816051cf85a92e913cb5b7d4b3cafe8aded0e602900875caba90

Download Submit
memory/2716-144-0x0000000001E60000-0x0000000001FB3000-memory.dmp

Filesize
1.3MB

Download
memory/2716-145-0x0000000001E60000-0x0000000001FB3000-memory.dmp

Filesize
1.3MB

Download
memory/2716-143-0x0000000001E60000-0x0000000001FB3000-memory.dmp

Filesize
1.3MB

Download
memory/3132-134-0x00007FFF5A410000-0x00007FFF5A420000-memory.dmp

Filesize
64KB

Download
memory/3132-138-0x00007FFF58060000-0x00007FFF58070000-memory.dmp

Filesize
64KB

Download
memory/3132-135-0x00007FFF5A410000-0x00007FFF5A420000-memory.dmp

Filesize
64KB

Download
memory/3132-133-0x00007FFF5A410000-0x00007FFF5A420000-memory.dmp

Filesize
64KB

Download
memory/3132-137-0x00007FFF58060000-0x00007FFF58070000-memory.dmp

Filesize
64KB

Download
memory/3132-132-0x00007FFF5A410000-0x00007FFF5A420000-memory.dmp

Filesize
64KB

Download
memory/3132-136-0x00007FFF5A410000-0x00007FFF5A420000-memory.dmp

Filesize
64KB

Download
memory/3132-148-0x00007FFF5A410000-0x00007FFF5A420000-memory.dmp

Filesize
64KB

Download
memory/3132-147-0x00007FFF5A410000-0x00007FFF5A420000-memory.dmp

Filesize
64KB

Download
memory/3132-149-0x00007FFF5A410000-0x00007FFF5A420000-memory.dmp

Filesize
64KB

Download
memory/3132-150-0x00007FFF5A410000-0x00007FFF5A420000-memory.dmp

Filesize
64KB

Download