guloader | b4f06ccc40afc1ae89f9c30b744780b8278f74518ef3e77c97aa0ddba65532dd

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
20-05-2024 04:10

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General

Target

Stateent6_from_emerat_group.pdf.exe
Size

263KB
MD5

5da57fce93a85e91d68c9d9fe5fa71c8
SHA1

e2dcbfd47f2e6f33bb5a594c789b67a7f0585f3a
SHA256

4f9cda81a57f8eb019f94a2983c56f5f8a50813d332dd3207f33f97fdc55346e
SHA512

f7042e72bc5856b285ffbefc7139665762d313af155b4419ee3b8d7840cca089ad14ad94f5ddc97d0860a7c6f8c5af5e8493b49533c77bc372281b97008020a0
SSDEEP

6144:ip0TLAkzL7r9r/EDppppppppppppppppppppppppppppp0G7:iuTNP7r9r/+pppppppppppppppppppph

Score

10^/10

guloader downloader guloader persistence

Malware Config

Extracted

Family

guloader

https://onedrive.live.com/download?cid=886791A338196A5D&resid=886791A338196A5D%211899&authkey=AOIrPjbXhW_WZVo

xor.base64

Signatures

Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader

Guloader payload 2 IoCs

guloader

Processes:

resource	yara_rule
behavioral2/memory/4304-2-0x0000000002250000-0x0000000002257000-memory.dmp	family_guloader
behavioral2/memory/2924-5-0x0000000000B00000-0x0000000000C00000-memory.dmp	family_guloader

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

RegAsm.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-540404634-651139247-2967210625-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Egebks8 = "C:\\Users\\Admin\\SAMMEN\\eventyrromaner.exe"	RegAsm.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

Stateent6_from_emerat_group.pdf.exeRegAsm.exe

pid process

4304 Stateent6_from_emerat_group.pdf.exe
2924 RegAsm.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

Stateent6_from_emerat_group.pdf.exe

description pid process target process

PID 4304 set thread context of 2924 4304 Stateent6_from_emerat_group.pdf.exe RegAsm.exe
Suspicious behavior: MapViewOfSection 1 IoCs

Processes:

Stateent6_from_emerat_group.pdf.exe

pid process

4304 Stateent6_from_emerat_group.pdf.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Stateent6_from_emerat_group.pdf.exe

pid process

4304 Stateent6_from_emerat_group.pdf.exe

pid	process
4304	Stateent6_from_emerat_group.pdf.exe
2924	RegAsm.exe

description	pid	process	target process
PID 4304 set thread context of 2924	4304	Stateent6_from_emerat_group.pdf.exe	RegAsm.exe

pid	process
4304	Stateent6_from_emerat_group.pdf.exe

pid	process
4304	Stateent6_from_emerat_group.pdf.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

Stateent6_from_emerat_group.pdf.exe

description	pid	process	target process
PID 4304 wrote to memory of 2924	4304	Stateent6_from_emerat_group.pdf.exe	RegAsm.exe
PID 4304 wrote to memory of 2924	4304	Stateent6_from_emerat_group.pdf.exe	RegAsm.exe
PID 4304 wrote to memory of 2924	4304	Stateent6_from_emerat_group.pdf.exe	RegAsm.exe
PID 4304 wrote to memory of 2924	4304	Stateent6_from_emerat_group.pdf.exe	RegAsm.exe

C:\Users\Admin\AppData\Local\Temp\Stateent6_from_emerat_group.pdf.exe
"C:\Users\Admin\AppData\Local\Temp\Stateent6_from_emerat_group.pdf.exe"
1⤵
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4304

C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
"C:\Users\Admin\AppData\Local\Temp\Stateent6_from_emerat_group.pdf.exe"
2⤵
- Adds Run key to start application
- Suspicious use of NtSetInformationThreadHideFromDebugger
PID:2924

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

memory/2924-6-0x0000000077981000-0x0000000077AA1000-memory.dmp

Filesize
1.1MB

Download
memory/2924-5-0x0000000000B00000-0x0000000000C00000-memory.dmp

Filesize
1024KB

Download
memory/4304-2-0x0000000002250000-0x0000000002257000-memory.dmp

Filesize
28KB

Download
memory/4304-3-0x0000000077981000-0x0000000077AA1000-memory.dmp

Filesize
1.1MB

Download
memory/4304-10-0x0000000002250000-0x0000000002257000-memory.dmp

Filesize
28KB

Download
memory/4304-11-0x0000000002250000-0x0000000002257000-memory.dmp

Filesize
28KB

Download