b5d5cd9f663587f2151ec927231d7058d317666224b71c201bf5db90658c12ac

General

Target

b5d5cd9f663587f2151ec927231d7058d317666224b71c201bf5db90658c12ac.xlsm
Size

83KB
MD5

91ee11d4e4533a1346dc00ea597fe37e
SHA1

3948c694aca4b5d18a12bd2ff0fe5339d9923a02
SHA256

b5d5cd9f663587f2151ec927231d7058d317666224b71c201bf5db90658c12ac
SHA512

ad6a4640d5044aea187596b74013f6ca3e3e0382114d3bb55a2835e6a9aa0f807767d218ca5bfe9b31df851c765721b4a7c174aa0ee00e0d9a0410436ee9df03

Score

10^/10

Malware Config

Extracted

Language

xlm4.0

Source

URLs

xlm40.dropper

http://recont.com/n8xbqb/lwEORjcJYPKCNQ/

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	1836	1028	rundll32.exe	EXCEL.EXE

Blocklisted process makes network request 2 IoCs

Processes:

rundll32.exe

flow pid process

47 3816 rundll32.exe
48 3816 rundll32.exe
Downloads MZ/PE file
Loads dropped DLL 2 IoCs

Processes:

rundll32.exerundll32.exe

pid process

1836 rundll32.exe
1308 rundll32.exe
Drops file in System32 directory 1 IoCs

Processes:

rundll32.exe

description ioc process

File opened for modification C:\Windows\SysWOW64\Rvknorheyadnqlg\utgdhh.jou 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
47	3816	rundll32.exe
48	3816	rundll32.exe

pid	process
1836	rundll32.exe
1308	rundll32.exe

description	ioc	process
File opened for modification	C:\Windows\SysWOW64\Rvknorheyadnqlg\utgdhh.jou	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 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

1028 EXCEL.EXE
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

rundll32.exe

pid process

3816 rundll32.exe
3816 rundll32.exe

pid	process
3816	rundll32.exe
3816	rundll32.exe

Suspicious use of SetWindowsHookEx 12 IoCs

Processes:

EXCEL.EXE

pid	process
1028	EXCEL.EXE
1028	EXCEL.EXE
1028	EXCEL.EXE
1028	EXCEL.EXE
1028	EXCEL.EXE
1028	EXCEL.EXE
1028	EXCEL.EXE
1028	EXCEL.EXE
1028	EXCEL.EXE
1028	EXCEL.EXE
1028	EXCEL.EXE
1028	EXCEL.EXE

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

EXCEL.EXErundll32.exerundll32.exerundll32.exe

description	pid	process	target process
PID 1028 wrote to memory of 1836	1028	EXCEL.EXE	rundll32.exe
PID 1028 wrote to memory of 1836	1028	EXCEL.EXE	rundll32.exe
PID 1028 wrote to memory of 1836	1028	EXCEL.EXE	rundll32.exe
PID 1836 wrote to memory of 1308	1836	rundll32.exe	rundll32.exe
PID 1836 wrote to memory of 1308	1836	rundll32.exe	rundll32.exe
PID 1836 wrote to memory of 1308	1836	rundll32.exe	rundll32.exe
PID 1308 wrote to memory of 1988	1308	rundll32.exe	rundll32.exe
PID 1308 wrote to memory of 1988	1308	rundll32.exe	rundll32.exe
PID 1308 wrote to memory of 1988	1308	rundll32.exe	rundll32.exe
PID 1988 wrote to memory of 3816	1988	rundll32.exe	rundll32.exe
PID 1988 wrote to memory of 3816	1988	rundll32.exe	rundll32.exe
PID 1988 wrote to memory of 3816	1988	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\b5d5cd9f663587f2151ec927231d7058d317666224b71c201bf5db90658c12ac.xlsm"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1028

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:1836

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:1308

C:\Windows\SysWOW64\rundll32.exe
C:\Windows\SysWOW64\rundll32.exe "C:\Windows\SysWOW64\Rvknorheyadnqlg\utgdhh.jou",IDcdqAx
4⤵
- Suspicious use of WriteProcessMemory
PID:1988

C:\Windows\SysWOW64\rundll32.exe
C:\Windows\SysWOW64\rundll32.exe "C:\Windows\System32\Rvknorheyadnqlg\utgdhh.jou",DllRegisterServer
5⤵
- Blocklisted process makes network request
- Suspicious behavior: EnumeratesProcesses
PID:3816

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
ebe5f94c3f46923100fcad7393ebddcf

SHA1
a56bfc3bd2d0f50a78b0fea09542b2c60f16f27e

SHA256
3156cc6407069ebbfd20655fd869972986805ec525287a4f320f83c2517c450d

SHA512
7991152525b80554044ccbf7c29727eff4a4811b13ba47682fa084b055bc0b9e2ce8eb431159be47aaeaa34b7e3b856a000e6ac199a81ffe46b23618c7d7e9d6

Download Submit
\Users\Admin\erum.ocx
MD5
ebe5f94c3f46923100fcad7393ebddcf

SHA1
a56bfc3bd2d0f50a78b0fea09542b2c60f16f27e

SHA256
3156cc6407069ebbfd20655fd869972986805ec525287a4f320f83c2517c450d

SHA512
7991152525b80554044ccbf7c29727eff4a4811b13ba47682fa084b055bc0b9e2ce8eb431159be47aaeaa34b7e3b856a000e6ac199a81ffe46b23618c7d7e9d6

Download Submit
\Users\Admin\erum.ocx
MD5
ebe5f94c3f46923100fcad7393ebddcf

SHA1
a56bfc3bd2d0f50a78b0fea09542b2c60f16f27e

SHA256
3156cc6407069ebbfd20655fd869972986805ec525287a4f320f83c2517c450d

SHA512
7991152525b80554044ccbf7c29727eff4a4811b13ba47682fa084b055bc0b9e2ce8eb431159be47aaeaa34b7e3b856a000e6ac199a81ffe46b23618c7d7e9d6

Download Submit
memory/1028-119-0x0000025259850000-0x0000025259852000-memory.dmp

Filesize
8KB

Download
memory/1028-115-0x00007FFDEE7B0000-0x00007FFDEE7C0000-memory.dmp

Filesize
64KB

Download
memory/1028-120-0x0000025259850000-0x0000025259852000-memory.dmp

Filesize
8KB

Download
memory/1028-121-0x00007FFDEE7B0000-0x00007FFDEE7C0000-memory.dmp

Filesize
64KB

Download
memory/1028-122-0x0000025259850000-0x0000025259852000-memory.dmp

Filesize
8KB

Download
memory/1028-128-0x00007FFDEBBB0000-0x00007FFDEBBC0000-memory.dmp

Filesize
64KB

Download
memory/1028-129-0x00007FFDEBBB0000-0x00007FFDEBBC0000-memory.dmp

Filesize
64KB

Download
memory/1028-116-0x00007FFDEE7B0000-0x00007FFDEE7C0000-memory.dmp

Filesize
64KB

Download
memory/1028-118-0x00007FFDEE7B0000-0x00007FFDEE7C0000-memory.dmp

Filesize
64KB

Download
memory/1028-117-0x00007FFDEE7B0000-0x00007FFDEE7C0000-memory.dmp

Filesize
64KB

Download
memory/1308-266-0x0000000000000000-mapping.dmp

Download
memory/1836-261-0x0000000000000000-mapping.dmp

Download
memory/1988-282-0x0000000000000000-mapping.dmp

Download
memory/3816-287-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads