guloader | b31f4aeb39edab45b99780aebf98451f2b9a045bb42814d2f0b3458ff2a3995d

General

Target

418a345985b3014859baebf1fb029ae8_JaffaCakes118.exe
Size

104KB
MD5

418a345985b3014859baebf1fb029ae8
SHA1

0eb5e89db92c78699f15d66c6adbedf52225c3c2
SHA256

b31f4aeb39edab45b99780aebf98451f2b9a045bb42814d2f0b3458ff2a3995d
SHA512

aea4ada28c2392728b18e269698e8b5e6ede1fb4a413e287cc0b17dd315a978f5e5cc9ab3402e734af207eb15ac0af4025849b5d930b1c78e54b00396a3c6f4b
SSDEEP

768:qY0Kk0AP0UM/ikfJ+1bmamD+OlQncbNyywqx2grUX7TUi:X1AP017B+1bP+jQqUqnrFi

Score

10^/10

guloader downloader persistence

Malware Config

Extracted

Family

guloader

C2

http://rudraagrointernational.com/cgi-bins/bin/98kksjh.bin

http://cassiagumrefined.com/css/animates/bin/98kksjh.bin

xor.base64

Signatures

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

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-540404634-651139247-2967210625-1000\Control Panel\International\Geo\Nation	418a345985b3014859baebf1fb029ae8_JaffaCakes118.exe

Executes dropped EXE 1 IoCs

pid	Process
4240	office365.exe

Loads dropped DLL 1 IoCs

pid	Process
4368	office365.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-540404634-651139247-2967210625-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\crome = "C:\\Users\\Admin\\AppData\\Local\\Temp\\sub\\office365.vbs"	418a345985b3014859baebf1fb029ae8_JaffaCakes118.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-540404634-651139247-2967210625-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\crome = "C:\\Users\\Admin\\AppData\\Local\\Temp\\sub\\office365.vbs"	office365.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 4 IoCs

pid	Process
2336	418a345985b3014859baebf1fb029ae8_JaffaCakes118.exe
4548	418a345985b3014859baebf1fb029ae8_JaffaCakes118.exe
4240	office365.exe
4368	office365.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2336 set thread context of 4548	2336	418a345985b3014859baebf1fb029ae8_JaffaCakes118.exe	92
PID 4240 set thread context of 4368	4240	office365.exe	96

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
2336	418a345985b3014859baebf1fb029ae8_JaffaCakes118.exe
4240	office365.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2336	418a345985b3014859baebf1fb029ae8_JaffaCakes118.exe
4240	office365.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 2336 wrote to memory of 4548	2336	418a345985b3014859baebf1fb029ae8_JaffaCakes118.exe	92
PID 2336 wrote to memory of 4548	2336	418a345985b3014859baebf1fb029ae8_JaffaCakes118.exe	92
PID 2336 wrote to memory of 4548	2336	418a345985b3014859baebf1fb029ae8_JaffaCakes118.exe	92
PID 2336 wrote to memory of 4548	2336	418a345985b3014859baebf1fb029ae8_JaffaCakes118.exe	92
PID 4548 wrote to memory of 4240	4548	418a345985b3014859baebf1fb029ae8_JaffaCakes118.exe	95
PID 4548 wrote to memory of 4240	4548	418a345985b3014859baebf1fb029ae8_JaffaCakes118.exe	95
PID 4548 wrote to memory of 4240	4548	418a345985b3014859baebf1fb029ae8_JaffaCakes118.exe	95
PID 4240 wrote to memory of 4368	4240	office365.exe	96
PID 4240 wrote to memory of 4368	4240	office365.exe	96
PID 4240 wrote to memory of 4368	4240	office365.exe	96
PID 4240 wrote to memory of 4368	4240	office365.exe	96

C:\Users\Admin\AppData\Local\Temp\418a345985b3014859baebf1fb029ae8_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\418a345985b3014859baebf1fb029ae8_JaffaCakes118.exe"
1⤵
- Adds Run key to start application
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2336
- C:\Users\Admin\AppData\Local\Temp\418a345985b3014859baebf1fb029ae8_JaffaCakes118.exe
  "C:\Users\Admin\AppData\Local\Temp\418a345985b3014859baebf1fb029ae8_JaffaCakes118.exe"
  2⤵
  - Checks computer location settings
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious use of WriteProcessMemory
  PID:4548
- - C:\Users\Admin\AppData\Local\Temp\sub\office365.exe
    "C:\Users\Admin\AppData\Local\Temp\sub\office365.exe"
    3⤵
    - Executes dropped EXE
    - Adds Run key to start application
    - Suspicious use of NtSetInformationThreadHideFromDebugger
    - Suspicious use of SetThreadContext
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4240
  - - C:\Users\Admin\AppData\Local\Temp\sub\office365.exe
      "C:\Users\Admin\AppData\Local\Temp\sub\office365.exe"
      4⤵
      Loads dropped DLL
      Suspicious use of NtSetInformationThreadHideFromDebugger
      PID:4368

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\sub\office365.exe

Filesize
104KB

MD5
418a345985b3014859baebf1fb029ae8

SHA1
0eb5e89db92c78699f15d66c6adbedf52225c3c2

SHA256
b31f4aeb39edab45b99780aebf98451f2b9a045bb42814d2f0b3458ff2a3995d

SHA512
aea4ada28c2392728b18e269698e8b5e6ede1fb4a413e287cc0b17dd315a978f5e5cc9ab3402e734af207eb15ac0af4025849b5d930b1c78e54b00396a3c6f4b

Download Submit
memory/2336-2-0x0000000002160000-0x0000000002170000-memory.dmp

Filesize
64KB

Download
memory/2336-7-0x0000000002160000-0x0000000002170000-memory.dmp

Filesize
64KB

Download
memory/2336-5-0x0000000077A01000-0x0000000077B21000-memory.dmp

Filesize
1.1MB

Download
memory/4240-23-0x0000000001FA0000-0x0000000001FB0000-memory.dmp

Filesize
64KB

Download
memory/4240-26-0x0000000001FA0000-0x0000000001FB0000-memory.dmp

Filesize
64KB

Download
memory/4368-28-0x0000000000560000-0x0000000000660000-memory.dmp

Filesize
1024KB

Download
memory/4548-6-0x0000000000560000-0x0000000000660000-memory.dmp

Filesize
1024KB

Download
memory/4548-3-0x0000000000400000-0x000000000055D000-memory.dmp

Filesize
1.4MB

Download
memory/4548-9-0x0000000077A01000-0x0000000077B21000-memory.dmp

Filesize
1.1MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads