guloader | 821f2880a8218afc0d30711b46f7d28e9adb2cd6c3db88b881de91090e72337f

General

Target

new order requirment-21 July.xlsx
Size

1.2MB
MD5

25f7735ff71a70abf4bb508d2711f50b
SHA1

7f40fff223019a3e399ca0ae0990afaf2695e93b
SHA256

821f2880a8218afc0d30711b46f7d28e9adb2cd6c3db88b881de91090e72337f
SHA512

27cd8ad83792a767a37ad9c0f22c5af3ab065bed8ec83ed577597f60fc8158e2fff0c83ab3f539e8e61a711f8ac0e35a9aa0534c3d8ae4fa054397c2c6b2bc4d

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

6 1520 EQNEDT32.EXE
Downloads MZ/PE file
Executes dropped EXE 1 IoCs

Processes:

vbc.exe

pid process

1728 vbc.exe
Loads dropped DLL 5 IoCs

Processes:

EQNEDT32.EXE

pid process

1520 EQNEDT32.EXE
1520 EQNEDT32.EXE
1520 EQNEDT32.EXE
1520 EQNEDT32.EXE
1520 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

1520 EQNEDT32.EXE

flow	pid	process
6	1520	EQNEDT32.EXE

pid	process
1728	vbc.exe

pid	process
1520	EQNEDT32.EXE
1520	EQNEDT32.EXE
1520	EQNEDT32.EXE
1520	EQNEDT32.EXE
1520	EQNEDT32.EXE

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

pid	process
1520	EQNEDT32.EXE

Modifies Internet Explorer settings 1 TTPs 9 IoCs

adware spyware

Modify Registry

T1112

Processes:

EXCEL.EXE

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt	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 (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
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
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\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
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\Toolbar	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

1820 EXCEL.EXE
Suspicious use of SetWindowsHookEx 4 IoCs

Processes:

EXCEL.EXEvbc.exe

pid process

1820 EXCEL.EXE
1820 EXCEL.EXE
1820 EXCEL.EXE
1728 vbc.exe

pid	process
1820	EXCEL.EXE

pid	process
1820	EXCEL.EXE
1820	EXCEL.EXE
1820	EXCEL.EXE
1728	vbc.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

EQNEDT32.EXE

description	pid	process	target process
PID 1520 wrote to memory of 1728	1520	EQNEDT32.EXE	vbc.exe
PID 1520 wrote to memory of 1728	1520	EQNEDT32.EXE	vbc.exe
PID 1520 wrote to memory of 1728	1520	EQNEDT32.EXE	vbc.exe
PID 1520 wrote to memory of 1728	1520	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\new order requirment-21 July.xlsx"
1⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
PID:1820

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:1520

C:\Users\Public\vbc.exe
"C:\Users\Public\vbc.exe"
2⤵
- Executes dropped EXE
- Suspicious use of SetWindowsHookEx
PID:1728

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
19cac1ee3a6e5e9f83054616f5d5ce6f

SHA1
5b7f16098760f887b0bdc5fee9223d022e0597fb

SHA256
3709110cc04e0eaffe10bec5e8a5c82b858bee4195975e7bcd30c50b246f56c3

SHA512
75d7cc20b44224ab616b9d4e6edd2c527c4245f5752430a08ed7a68a3d1596bfe5f9a16a447a57e8cbbe965b7377c6259f481c6a1ae8d262238ad25dce14a0ad

Download Submit
\Users\Public\vbc.exe
MD5
19cac1ee3a6e5e9f83054616f5d5ce6f

SHA1
5b7f16098760f887b0bdc5fee9223d022e0597fb

SHA256
3709110cc04e0eaffe10bec5e8a5c82b858bee4195975e7bcd30c50b246f56c3

SHA512
75d7cc20b44224ab616b9d4e6edd2c527c4245f5752430a08ed7a68a3d1596bfe5f9a16a447a57e8cbbe965b7377c6259f481c6a1ae8d262238ad25dce14a0ad

Download Submit
\Users\Public\vbc.exe
MD5
19cac1ee3a6e5e9f83054616f5d5ce6f

SHA1
5b7f16098760f887b0bdc5fee9223d022e0597fb

SHA256
3709110cc04e0eaffe10bec5e8a5c82b858bee4195975e7bcd30c50b246f56c3

SHA512
75d7cc20b44224ab616b9d4e6edd2c527c4245f5752430a08ed7a68a3d1596bfe5f9a16a447a57e8cbbe965b7377c6259f481c6a1ae8d262238ad25dce14a0ad

Download Submit
\Users\Public\vbc.exe
MD5
19cac1ee3a6e5e9f83054616f5d5ce6f

SHA1
5b7f16098760f887b0bdc5fee9223d022e0597fb

SHA256
3709110cc04e0eaffe10bec5e8a5c82b858bee4195975e7bcd30c50b246f56c3

SHA512
75d7cc20b44224ab616b9d4e6edd2c527c4245f5752430a08ed7a68a3d1596bfe5f9a16a447a57e8cbbe965b7377c6259f481c6a1ae8d262238ad25dce14a0ad

Download Submit
\Users\Public\vbc.exe
MD5
19cac1ee3a6e5e9f83054616f5d5ce6f

SHA1
5b7f16098760f887b0bdc5fee9223d022e0597fb

SHA256
3709110cc04e0eaffe10bec5e8a5c82b858bee4195975e7bcd30c50b246f56c3

SHA512
75d7cc20b44224ab616b9d4e6edd2c527c4245f5752430a08ed7a68a3d1596bfe5f9a16a447a57e8cbbe965b7377c6259f481c6a1ae8d262238ad25dce14a0ad

Download Submit
\Users\Public\vbc.exe
MD5
19cac1ee3a6e5e9f83054616f5d5ce6f

SHA1
5b7f16098760f887b0bdc5fee9223d022e0597fb

SHA256
3709110cc04e0eaffe10bec5e8a5c82b858bee4195975e7bcd30c50b246f56c3

SHA512
75d7cc20b44224ab616b9d4e6edd2c527c4245f5752430a08ed7a68a3d1596bfe5f9a16a447a57e8cbbe965b7377c6259f481c6a1ae8d262238ad25dce14a0ad

Download Submit
memory/1520-62-0x0000000075FE1000-0x0000000075FE3000-memory.dmp

Filesize
8KB

Download
memory/1728-68-0x0000000000000000-mapping.dmp

Download
memory/1728-72-0x0000000000330000-0x000000000033E000-memory.dmp

Filesize
56KB

Download
memory/1820-60-0x0000000071521000-0x0000000071523000-memory.dmp

Filesize
8KB

Download
memory/1820-61-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1820-59-0x000000002FBC1000-0x000000002FBC4000-memory.dmp

Filesize
12KB

Download
memory/1820-74-0x0000000005EF0000-0x0000000006B3A000-memory.dmp

Filesize
12.3MB

Download
memory/1820-73-0x0000000005EF0000-0x0000000006B3A000-memory.dmp

Filesize
12.3MB

Download
memory/1820-77-0x0000000005EF0000-0x0000000006B3A000-memory.dmp

Filesize
12.3MB

Download
memory/1820-76-0x0000000005EF0000-0x0000000006B3A000-memory.dmp

Filesize
12.3MB

Download
memory/1820-75-0x0000000005EF0000-0x0000000006B3A000-memory.dmp

Filesize
12.3MB

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Analysis

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