8bdcc1592ffaee9154ed4331a44fa52af3b2baebbd4ef71840adc73b38635d9e

Resubmissions

21-04-2021 16:14

210421-ygskj3c65s 10

21-04-2021 16:13

210421-hb7vkpnwme 8

21-04-2021 16:09

210421-yxfjrtzzx6 10

Analysis

max time kernel
120s
max time network
126s
platform
windows10_x64
resource
win10v20210410
submitted
21-04-2021 16:09

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General

Target

Invoice #035.xlsm
Size

155KB
MD5

77f482d7c33d70474d451cf2546f4b4f
SHA1

9ef86f2a8171e50ec5734886d895885280e029d8
SHA256

8bdcc1592ffaee9154ed4331a44fa52af3b2baebbd4ef71840adc73b38635d9e
SHA512

f656c8f2a14ddb066469f20ab5303f5a0ec18d17648e67a59fde4902dc923f5a70fe4cc4964251a705275e98073df76821ec6e3ee8d93982fb86ec71a698404a

Score

10^/10

evasion trojan

Malware Config

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	3968	3656	rundll32.exe	EXCEL.EXE

Downloads MZ/PE file
Loads dropped DLL 1 IoCs

Processes:

rundll32.exe

pid process

1604 rundll32.exe
Checks whether UAC is enabled 1 TTPs 1 IoCs
evasion trojan

System Information Discovery
T1082

Processes:

rundll32.exe

description ioc process

Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA rundll32.exe

pid	process
1604	rundll32.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	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\ProcessorNameString	EXCEL.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	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 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

Script User-Agent 1 IoCs
Uses user-agent string associated with script host/environment.

Processes:

description flow ioc

HTTP User-Agent header 17 Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

3656 EXCEL.EXE

description	flow	ioc
HTTP User-Agent header	17	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)

Suspicious use of SetWindowsHookEx 12 IoCs

Processes:

EXCEL.EXE

pid	process
3656	EXCEL.EXE
3656	EXCEL.EXE
3656	EXCEL.EXE
3656	EXCEL.EXE
3656	EXCEL.EXE
3656	EXCEL.EXE
3656	EXCEL.EXE
3656	EXCEL.EXE
3656	EXCEL.EXE
3656	EXCEL.EXE
3656	EXCEL.EXE
3656	EXCEL.EXE

Suspicious use of WriteProcessMemory 5 IoCs

Processes:

EXCEL.EXErundll32.exe

description	pid	process	target process
PID 3656 wrote to memory of 3968	3656	EXCEL.EXE	rundll32.exe
PID 3656 wrote to memory of 3968	3656	EXCEL.EXE	rundll32.exe
PID 3968 wrote to memory of 1604	3968	rundll32.exe	rundll32.exe
PID 3968 wrote to memory of 1604	3968	rundll32.exe	rundll32.exe
PID 3968 wrote to memory of 1604	3968	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\Invoice #035.xlsm"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3656

C:\Windows\System32\rundll32.exe
"C:\Windows\System32\rundll32.exe" "C:\Users\Admin\AppData\Roaming\43590..dll" JsVarAddRef
2⤵
- Process spawned unexpected child process
- Suspicious use of WriteProcessMemory
PID:3968

C:\Windows\SysWOW64\rundll32.exe
"C:\Windows\System32\rundll32.exe" "C:\Users\Admin\AppData\Roaming\43590..dll" JsVarAddRef
3⤵
- Loads dropped DLL
- Checks whether UAC is enabled
PID:1604

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Query Registry

T1012

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\43590..dll
MD5
bbcb7773041252a774459af0c14118c2

SHA1
1744d5de251afe5c07ee4ff144b01239d62f58b7

SHA256
1adc9f81859ab8ca08975362f5b76bb00e72612f26e741a6791074c19b60547d

SHA512
911b279ec6b2af0725d54df83fe5583d12fbc7d633239fe1435bf444b0b49e9f3500ff43978ca75eb897300bd526732021f6d8f5e0af51cc6f4376e5b2f856f2

Download Submit
\Users\Admin\AppData\Roaming\43590..dll
MD5
bbcb7773041252a774459af0c14118c2

SHA1
1744d5de251afe5c07ee4ff144b01239d62f58b7

SHA256
1adc9f81859ab8ca08975362f5b76bb00e72612f26e741a6791074c19b60547d

SHA512
911b279ec6b2af0725d54df83fe5583d12fbc7d633239fe1435bf444b0b49e9f3500ff43978ca75eb897300bd526732021f6d8f5e0af51cc6f4376e5b2f856f2

Download Submit
memory/1604-183-0x0000000003180000-0x0000000003186000-memory.dmp

Filesize
24KB

Download
memory/1604-181-0x0000000000000000-mapping.dmp

Download
memory/3656-117-0x00007FF85A170000-0x00007FF85A180000-memory.dmp

Filesize
64KB

Download
memory/3656-122-0x00007FF85A170000-0x00007FF85A180000-memory.dmp

Filesize
64KB

Download
memory/3656-121-0x00007FF87ABF0000-0x00007FF87BCDE000-memory.dmp

Filesize
16.9MB

Download
memory/3656-123-0x00007FF878CF0000-0x00007FF87ABE5000-memory.dmp

Filesize
31.0MB

Download
memory/3656-118-0x00007FF85A170000-0x00007FF85A180000-memory.dmp

Filesize
64KB

Download
memory/3656-114-0x00007FF711840000-0x00007FF714DF6000-memory.dmp

Filesize
53.7MB

Download
memory/3656-116-0x00007FF85A170000-0x00007FF85A180000-memory.dmp

Filesize
64KB

Download
memory/3656-115-0x00007FF85A170000-0x00007FF85A180000-memory.dmp

Filesize
64KB

Download
memory/3968-179-0x0000000000000000-mapping.dmp

Download