8287e916655be8dabc37550610daa219f5d5351eb8521da64ee9a22f9af7b5e4

General

Target

subscription_1617817060.xlsb
Size

249KB
MD5

e1edead6d69e4c33cf44904ef2bd0b0f
SHA1

e357ddf5ece78bac5666462c264a736230ef239f
SHA256

c76bb9443baff9e799b3b1cd7c4bd18759ff17acf50f2c3e6f9970caf3015a8f
SHA512

806d031cb21545d39cf32818467c924471d6f37328eff8ecd990253ea7bef2659bd723098ef918af77c5f91715ca5240398f6f09f25e8d57ed093bfb7d06529f

Score

10^/10

Malware Config

Signatures

Process spawned unexpected child process 1 IoCs

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

Processes:

cmd.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	996	4772	cmd.exe	EXCEL.EXE

Blocklisted process makes network request 1 IoCs

Processes:

rundll32.exe

flow pid process

24 1892 rundll32.exe
Loads dropped DLL 1 IoCs

Processes:

rundll32.exe

pid process

1892 rundll32.exe

flow	pid	process
24	1892	rundll32.exe

pid	process
1892	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 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

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

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

4772 EXCEL.EXE

Suspicious use of SetWindowsHookEx 12 IoCs

Processes:

EXCEL.EXE

pid	process
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

EXCEL.EXEcmd.exerundll32.exe

description	pid	process	target process
PID 4772 wrote to memory of 996	4772	EXCEL.EXE	cmd.exe
PID 4772 wrote to memory of 996	4772	EXCEL.EXE	cmd.exe
PID 996 wrote to memory of 1560	996	cmd.exe	certutil.exe
PID 996 wrote to memory of 1560	996	cmd.exe	certutil.exe
PID 996 wrote to memory of 1760	996	cmd.exe	rundll32.exe
PID 996 wrote to memory of 1760	996	cmd.exe	rundll32.exe
PID 1760 wrote to memory of 1892	1760	rundll32.exe	rundll32.exe
PID 1760 wrote to memory of 1892	1760	rundll32.exe	rundll32.exe
PID 1760 wrote to memory of 1892	1760	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\subscription_1617817060.xlsb"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4772

C:\Windows\SYSTEM32\cmd.exe
cmd.exe /c certutil -decode %PUBLIC%\14118.doy %PUBLIC%\14118.biy && rundll32 %PUBLIC%\14118.biy,DF1
2⤵
- Process spawned unexpected child process
- Suspicious use of WriteProcessMemory
PID:996

C:\Windows\system32\certutil.exe
certutil -decode C:\Users\Public\14118.doy C:\Users\Public\14118.biy
3⤵
PID:1560

C:\Windows\system32\rundll32.exe
rundll32 C:\Users\Public\14118.biy,DF1
3⤵
- Suspicious use of WriteProcessMemory
PID:1760

C:\Windows\SysWOW64\rundll32.exe
rundll32 C:\Users\Public\14118.biy,DF1
4⤵
- Blocklisted process makes network request
- Loads dropped DLL
PID:1892

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Public\14118.biy
MD5
64ee7574265691eb7636af9de468ce11

SHA1
66486c4d36d82d0c2eaefe4d6cf170224b1fb1af

SHA256
df16b3c76350f340988759cc21a78a7cf16831f08e95eb7592b86942859f863a

SHA512
6a2d2b1c19bfe05af7457d5faf61f1bcaebed1955f3210b62c187a51242f4fd565b479be38e36facbda9ef45d3f80d41e491e550bef027ad33d33e851970de70

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C:\Users\Public\14118.doy
MD5
317dfc2b5b8ced1ca8f228b251081eaf

SHA1
0d0c90c11e9413e38d1b7af7632022ca32af58dd

SHA256
5d75b97d969ff3eb4459e9bf5d21d650667e9094f527744c7384241d77a0281e

SHA512
be7a6bc219a6523c70b7701f269e933720f3cc7fef8a277cc03d781d56f660a97c950f1fbcc3f26270fae597128b3847233d8608964ba4789e3be8163401883b

Download Submit
\Users\Public\14118.biy
MD5
64ee7574265691eb7636af9de468ce11

SHA1
66486c4d36d82d0c2eaefe4d6cf170224b1fb1af

SHA256
df16b3c76350f340988759cc21a78a7cf16831f08e95eb7592b86942859f863a

SHA512
6a2d2b1c19bfe05af7457d5faf61f1bcaebed1955f3210b62c187a51242f4fd565b479be38e36facbda9ef45d3f80d41e491e550bef027ad33d33e851970de70

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memory/996-7-0x0000000000000000-mapping.dmp

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memory/1560-8-0x0000000000000000-mapping.dmp

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memory/1760-10-0x0000000000000000-mapping.dmp

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memory/1892-12-0x0000000000000000-mapping.dmp

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memory/1892-14-0x0000000000C90000-0x0000000000C95000-memory.dmp

Filesize
20KB

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memory/4772-6-0x00007FFF21F30000-0x00007FFF21F40000-memory.dmp

Filesize
64KB

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memory/4772-2-0x00007FFF21F30000-0x00007FFF21F40000-memory.dmp

Filesize
64KB

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memory/4772-5-0x00007FFF461E0000-0x00007FFF46817000-memory.dmp

Filesize
6.2MB

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memory/4772-4-0x00007FFF21F30000-0x00007FFF21F40000-memory.dmp

Filesize
64KB

Download
memory/4772-3-0x00007FFF21F30000-0x00007FFF21F40000-memory.dmp

Filesize
64KB

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads