guloader | 9584a27702d6f6fdecc4589a5c87b529ef2c41ca556ddf9325999a4bdb58fcc3

General

Target

CMA-CGM BOOKING CONFIRMATION.xlsx
Size

1.2MB
MD5

1a23b8c8e5fa52a917c92207a8316b55
SHA1

7b481fe511b2132d2d2dc7cad79aa5ebda0d3388
SHA256

9584a27702d6f6fdecc4589a5c87b529ef2c41ca556ddf9325999a4bdb58fcc3
SHA512

25b6303a6aa2996b82c0f6572d74e9b6bf39a617179f5c2a984643e953a7dcd56662e590fca95ae7b23e0cdf8873c86f5cc6d4417a3a5e5f071c0db5d8c10f86

Score

10^/10

guloader downloader

Malware Config

Signatures

Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader
Blocklisted process makes network request 1 IoCs

Processes:

EQNEDT32.EXE

flow pid process

5 1220 EQNEDT32.EXE
Downloads MZ/PE file
Executes dropped EXE 1 IoCs

Processes:

vbc.exe

pid process

1172 vbc.exe
Loads dropped DLL 5 IoCs

Processes:

EQNEDT32.EXE

pid process

1220 EQNEDT32.EXE
1220 EQNEDT32.EXE
1220 EQNEDT32.EXE
1220 EQNEDT32.EXE
1220 EQNEDT32.EXE
Uses the VBS compiler for execution 1 TTPs

Scripting
T1064
Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry
T1012

System Information Discovery
T1082

Processes:

EXCEL.EXE

description ioc process

Key opened \REGISTRY\MACHINE\Hardware\Description\System\FloatingPointProcessor EXCEL.EXE
Launches Equation Editor 1 TTPs 1 IoCs
Equation Editor is an old Office component often targeted by exploits such as CVE-2017-11882.
exploit

Exploitation for Client Execution
T1203

Processes:

EQNEDT32.EXE

pid process

1220 EQNEDT32.EXE

flow	pid	process
5	1220	EQNEDT32.EXE

pid	process
1172	vbc.exe

pid	process
1220	EQNEDT32.EXE
1220	EQNEDT32.EXE
1220	EQNEDT32.EXE
1220	EQNEDT32.EXE
1220	EQNEDT32.EXE

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

pid	process
1220	EQNEDT32.EXE

Modifies Internet Explorer settings 1 TTPs 9 IoCs

adware spyware

Modify Registry

T1112

Processes:

EXCEL.EXE

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\ONBttnIE.dll/105"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\Toolbar	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\EXCEL.EXE/3000"	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1"	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

2020 EXCEL.EXE
Suspicious use of SetWindowsHookEx 4 IoCs

Processes:

EXCEL.EXEvbc.exe

pid process

2020 EXCEL.EXE
2020 EXCEL.EXE
2020 EXCEL.EXE
1172 vbc.exe

pid	process
2020	EXCEL.EXE

pid	process
2020	EXCEL.EXE
2020	EXCEL.EXE
2020	EXCEL.EXE
1172	vbc.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

EQNEDT32.EXE

description	pid	process	target process
PID 1220 wrote to memory of 1172	1220	EQNEDT32.EXE	vbc.exe
PID 1220 wrote to memory of 1172	1220	EQNEDT32.EXE	vbc.exe
PID 1220 wrote to memory of 1172	1220	EQNEDT32.EXE	vbc.exe
PID 1220 wrote to memory of 1172	1220	EQNEDT32.EXE	vbc.exe

C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE
"C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" /dde "C:\Users\Admin\AppData\Local\Temp\CMA-CGM BOOKING CONFIRMATION.xlsx"
1⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
PID:2020

C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE
"C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE" -Embedding
1⤵
- Blocklisted process makes network request
- Loads dropped DLL
- Launches Equation Editor
- Suspicious use of WriteProcessMemory
PID:1220

C:\Users\Public\vbc.exe
"C:\Users\Public\vbc.exe"
2⤵
- Executes dropped EXE
- Suspicious use of SetWindowsHookEx
PID:1172

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scripting

1

T1064

Exploitation for Client Execution

1

T1203

Persistence

Privilege Escalation

Defense Evasion

Scripting

1

T1064

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Public\vbc.exe
MD5
08730cdd286a4c9d46b38bb6545ac311

SHA1
001bb7b5b8d63e505661d7e4a178d08abe6bbad7

SHA256
cb2a2537987e45c8461d40a0ec6c24215920519257134db91dd1369ff5abf342

SHA512
a6531eb4709af3e1270f1c4434d9abc87097e9f8d38c4ba5dc0ed61d7f469552de7259f638728fe71297d3748823064f75728e71df3531657a5aeb1952f412d8

Download Submit
\Users\Public\vbc.exe
MD5
08730cdd286a4c9d46b38bb6545ac311

SHA1
001bb7b5b8d63e505661d7e4a178d08abe6bbad7

SHA256
cb2a2537987e45c8461d40a0ec6c24215920519257134db91dd1369ff5abf342

SHA512
a6531eb4709af3e1270f1c4434d9abc87097e9f8d38c4ba5dc0ed61d7f469552de7259f638728fe71297d3748823064f75728e71df3531657a5aeb1952f412d8

Download Submit
\Users\Public\vbc.exe
MD5
08730cdd286a4c9d46b38bb6545ac311

SHA1
001bb7b5b8d63e505661d7e4a178d08abe6bbad7

SHA256
cb2a2537987e45c8461d40a0ec6c24215920519257134db91dd1369ff5abf342

SHA512
a6531eb4709af3e1270f1c4434d9abc87097e9f8d38c4ba5dc0ed61d7f469552de7259f638728fe71297d3748823064f75728e71df3531657a5aeb1952f412d8

Download Submit
\Users\Public\vbc.exe
MD5
08730cdd286a4c9d46b38bb6545ac311

SHA1
001bb7b5b8d63e505661d7e4a178d08abe6bbad7

SHA256
cb2a2537987e45c8461d40a0ec6c24215920519257134db91dd1369ff5abf342

SHA512
a6531eb4709af3e1270f1c4434d9abc87097e9f8d38c4ba5dc0ed61d7f469552de7259f638728fe71297d3748823064f75728e71df3531657a5aeb1952f412d8

Download Submit
\Users\Public\vbc.exe
MD5
08730cdd286a4c9d46b38bb6545ac311

SHA1
001bb7b5b8d63e505661d7e4a178d08abe6bbad7

SHA256
cb2a2537987e45c8461d40a0ec6c24215920519257134db91dd1369ff5abf342

SHA512
a6531eb4709af3e1270f1c4434d9abc87097e9f8d38c4ba5dc0ed61d7f469552de7259f638728fe71297d3748823064f75728e71df3531657a5aeb1952f412d8

Download Submit
\Users\Public\vbc.exe
MD5
08730cdd286a4c9d46b38bb6545ac311

SHA1
001bb7b5b8d63e505661d7e4a178d08abe6bbad7

SHA256
cb2a2537987e45c8461d40a0ec6c24215920519257134db91dd1369ff5abf342

SHA512
a6531eb4709af3e1270f1c4434d9abc87097e9f8d38c4ba5dc0ed61d7f469552de7259f638728fe71297d3748823064f75728e71df3531657a5aeb1952f412d8

Download Submit
memory/1172-69-0x0000000000000000-mapping.dmp

Download
memory/1172-73-0x0000000000290000-0x000000000029E000-memory.dmp

Filesize
56KB

Download
memory/1220-63-0x0000000076281000-0x0000000076283000-memory.dmp

Filesize
8KB

Download
memory/2020-62-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/2020-60-0x000000002F7C1000-0x000000002F7C4000-memory.dmp

Filesize
12KB

Download
memory/2020-61-0x0000000071941000-0x0000000071943000-memory.dmp

Filesize
8KB

Download
memory/2020-74-0x0000000006D60000-0x0000000006D63000-memory.dmp

Filesize
12KB

Download
memory/2020-75-0x0000000006D65000-0x0000000006D66000-memory.dmp

Filesize
4KB

Download
memory/2020-76-0x0000000006D66000-0x0000000006D68000-memory.dmp

Filesize
8KB

Download
memory/2020-77-0x0000000006D68000-0x0000000006D6A000-memory.dmp

Filesize
8KB

Download
memory/2020-78-0x0000000006D6A000-0x0000000006D6D000-memory.dmp

Filesize
12KB

Download

Analysis

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