79bce68ec5ad3e9621207959106af1204609929031f16fe15c0dcd1603c0bf8c

General

Target

79bce68ec5ad3e9621207959106af1204609929031f16fe15c0dcd1603c0bf8c.xlsm
Size

83KB
MD5

6b16c233d1a04de6c9d0759d865df8b6
SHA1

927f7fec1073b9072af0b2047194ff630ce0f170
SHA256

79bce68ec5ad3e9621207959106af1204609929031f16fe15c0dcd1603c0bf8c
SHA512

6b4a94de9a8e7b098a2de2f89d0cca40fb0b37352bd8b9fb378d68f48a3332bf4be489df1e7e7b22eb2463cb0230839b639ece6b8d4562aa32c8b4bc6d0ecaa6

Score

10^/10

Malware Config

Extracted

Language

xlm4.0

Source

URLs

xlm40.dropper

http://mail.emilyanncain.com/cgi-bin/A7NT3ENvn/

Signatures

Process spawned unexpected child process 1 IoCs

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

Processes:

rundll32.exe

description	pid	pid_target	process	target process
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	1784	2580	rundll32.exe	EXCEL.EXE

Blocklisted process makes network request 3 IoCs

Processes:

rundll32.exe

flow pid process

36 1996 rundll32.exe
37 1996 rundll32.exe
38 1996 rundll32.exe
Downloads MZ/PE file
Loads dropped DLL 2 IoCs

Processes:

rundll32.exerundll32.exe

pid process

1784 rundll32.exe
2456 rundll32.exe
Drops file in System32 directory 1 IoCs

Processes:

rundll32.exe

description ioc process

File opened for modification C:\Windows\SysWOW64\Ngxphbdudccumdsp\vbndbk.jav rundll32.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

flow	pid	process
36	1996	rundll32.exe
37	1996	rundll32.exe
38	1996	rundll32.exe

pid	process
1784	rundll32.exe
2456	rundll32.exe

description	ioc	process
File opened for modification	C:\Windows\SysWOW64\Ngxphbdudccumdsp\vbndbk.jav	rundll32.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

Processes:

EXCEL.EXE

description	ioc	process
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
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	EXCEL.EXE

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

Processes:

EXCEL.EXE

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

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

2580 EXCEL.EXE
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

rundll32.exe

pid process

1996 rundll32.exe
1996 rundll32.exe
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

EXCEL.EXE

pid process

2580 EXCEL.EXE
2580 EXCEL.EXE

pid	process
1996	rundll32.exe
1996	rundll32.exe

Suspicious use of SetWindowsHookEx 12 IoCs

Processes:

EXCEL.EXE

pid	process
2580	EXCEL.EXE
2580	EXCEL.EXE
2580	EXCEL.EXE
2580	EXCEL.EXE
2580	EXCEL.EXE
2580	EXCEL.EXE
2580	EXCEL.EXE
2580	EXCEL.EXE
2580	EXCEL.EXE
2580	EXCEL.EXE
2580	EXCEL.EXE
2580	EXCEL.EXE

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

EXCEL.EXErundll32.exerundll32.exerundll32.exe

description	pid	process	target process
PID 2580 wrote to memory of 1784	2580	EXCEL.EXE	rundll32.exe
PID 2580 wrote to memory of 1784	2580	EXCEL.EXE	rundll32.exe
PID 2580 wrote to memory of 1784	2580	EXCEL.EXE	rundll32.exe
PID 1784 wrote to memory of 2456	1784	rundll32.exe	rundll32.exe
PID 1784 wrote to memory of 2456	1784	rundll32.exe	rundll32.exe
PID 1784 wrote to memory of 2456	1784	rundll32.exe	rundll32.exe
PID 2456 wrote to memory of 848	2456	rundll32.exe	rundll32.exe
PID 2456 wrote to memory of 848	2456	rundll32.exe	rundll32.exe
PID 2456 wrote to memory of 848	2456	rundll32.exe	rundll32.exe
PID 848 wrote to memory of 1996	848	rundll32.exe	rundll32.exe
PID 848 wrote to memory of 1996	848	rundll32.exe	rundll32.exe
PID 848 wrote to memory of 1996	848	rundll32.exe	rundll32.exe

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\79bce68ec5ad3e9621207959106af1204609929031f16fe15c0dcd1603c0bf8c.xlsm"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2580

C:\Windows\SysWow64\rundll32.exe
C:\Windows\SysWow64\rundll32.exe ..\erum.ocx,D"&"l"&"lR"&"egister"&"Serve"&"r
2⤵
- Process spawned unexpected child process
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1784

C:\Windows\SysWOW64\rundll32.exe
C:\Windows\SysWOW64\rundll32.exe "C:\Users\Admin\erum.ocx",DllRegisterServer
3⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:2456

C:\Windows\SysWOW64\rundll32.exe
C:\Windows\SysWOW64\rundll32.exe "C:\Windows\SysWOW64\Ngxphbdudccumdsp\vbndbk.jav",mjTTZVpsalpOw
4⤵
- Suspicious use of WriteProcessMemory
PID:848

C:\Windows\SysWOW64\rundll32.exe
C:\Windows\SysWOW64\rundll32.exe "C:\Windows\System32\Ngxphbdudccumdsp\vbndbk.jav",DllRegisterServer
5⤵
- Blocklisted process makes network request
- Suspicious behavior: EnumeratesProcesses
PID:1996

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

3

T1082

Query Registry

2

T1012

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\erum.ocx
MD5
11c23d38111e5420f953956d39a05837

SHA1
d26a56a6efb44c6a93061fde0773dd78de97f134

SHA256
4fc90e8c69a7c44487356441ea5775106bb09b13b3cdb4d1b71d4034fc130de5

SHA512
ce4c5699a62e50851b2057417b286aa5a353fd97af8b798e70705f4bd6c29cf6a380b00695c9ff5eeb40e9f9889300f24860f37610c995a3a05222f416fcc30d

Download Submit
\Users\Admin\erum.ocx
MD5
11c23d38111e5420f953956d39a05837

SHA1
d26a56a6efb44c6a93061fde0773dd78de97f134

SHA256
4fc90e8c69a7c44487356441ea5775106bb09b13b3cdb4d1b71d4034fc130de5

SHA512
ce4c5699a62e50851b2057417b286aa5a353fd97af8b798e70705f4bd6c29cf6a380b00695c9ff5eeb40e9f9889300f24860f37610c995a3a05222f416fcc30d

Download Submit
\Users\Admin\erum.ocx
MD5
11c23d38111e5420f953956d39a05837

SHA1
d26a56a6efb44c6a93061fde0773dd78de97f134

SHA256
4fc90e8c69a7c44487356441ea5775106bb09b13b3cdb4d1b71d4034fc130de5

SHA512
ce4c5699a62e50851b2057417b286aa5a353fd97af8b798e70705f4bd6c29cf6a380b00695c9ff5eeb40e9f9889300f24860f37610c995a3a05222f416fcc30d

Download Submit
memory/848-279-0x0000000000000000-mapping.dmp

Download
memory/1784-253-0x0000000000000000-mapping.dmp

Download
memory/1996-284-0x0000000000000000-mapping.dmp

Download
memory/2456-258-0x0000000000000000-mapping.dmp

Download
memory/2580-119-0x00007FFB04400000-0x00007FFB04410000-memory.dmp

Filesize
64KB

Download
memory/2580-128-0x00007FFB00DC0000-0x00007FFB00DD0000-memory.dmp

Filesize
64KB

Download
memory/2580-129-0x00007FFB00DC0000-0x00007FFB00DD0000-memory.dmp

Filesize
64KB

Download
memory/2580-122-0x0000020D07300000-0x0000020D07302000-memory.dmp

Filesize
8KB

Download
memory/2580-121-0x0000020D07300000-0x0000020D07302000-memory.dmp

Filesize
8KB

Download
memory/2580-120-0x0000020D07300000-0x0000020D07302000-memory.dmp

Filesize
8KB

Download
memory/2580-115-0x00007FFB04400000-0x00007FFB04410000-memory.dmp

Filesize
64KB

Download
memory/2580-118-0x00007FFB04400000-0x00007FFB04410000-memory.dmp

Filesize
64KB

Download
memory/2580-117-0x00007FFB04400000-0x00007FFB04410000-memory.dmp

Filesize
64KB

Download
memory/2580-116-0x00007FFB04400000-0x00007FFB04410000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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