guloader | 792825ddddc6373018c58825b0ddb98b1857afdc07c8dac108b27df7fb558803

General

Target

b358b3862384f447759867e97e597d96_JaffaCakes118.exe
Size

72KB
MD5

b358b3862384f447759867e97e597d96
SHA1

43b7f92fdfe54f9359ffcca633dd1971f756d80a
SHA256

792825ddddc6373018c58825b0ddb98b1857afdc07c8dac108b27df7fb558803
SHA512

4f1950baa8ac67c0a2af5e8861ace88a0b4a141f4256421f2c2cd20f8d769c2946131c743f6cdd93e0314143a72ff41ee1128d016a834e4038f2f4dc23678e35
SSDEEP

1536:RESeLk0iVbBhjMpFUZlz3FmkBoXDhjMiVbleLk0:BeYBVzMEFkNMiVpeY

Score

10^/10

guloader discovery downloader persistence

Malware Config

Extracted

Family

guloader

C2

https://drive.google.com/uc?export=download&id=1bGDMzk6I7ixMsgGvWCAL1U7P556onAk8

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-1-5-21-355097885-2402257403-2971294179-1000\Control Panel\International\Geo\Nation	b358b3862384f447759867e97e597d96_JaffaCakes118.exe

Executes dropped EXE 1 IoCs

pid	Process
5024	Ratchkon.exe

Loads dropped DLL 1 IoCs

pid	Process
3104	Ratchkon.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-1-5-21-355097885-2402257403-2971294179-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\INTACTN = "C:\\Users\\Admin\\andensty\\Ratchkon.vbs"	Ratchkon.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-355097885-2402257403-2971294179-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\INTACTN = "C:\\Users\\Admin\\andensty\\Ratchkon.vbs"	b358b3862384f447759867e97e597d96_JaffaCakes118.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
22	drive.google.com
23	drive.google.com

Suspicious use of NtSetInformationThreadHideFromDebugger 4 IoCs

pid	Process
1900	b358b3862384f447759867e97e597d96_JaffaCakes118.exe
536	b358b3862384f447759867e97e597d96_JaffaCakes118.exe
5024	Ratchkon.exe
3104	Ratchkon.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1900 set thread context of 536	1900	b358b3862384f447759867e97e597d96_JaffaCakes118.exe	89
PID 5024 set thread context of 3104	5024	Ratchkon.exe	93

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b358b3862384f447759867e97e597d96_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b358b3862384f447759867e97e597d96_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Ratchkon.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Ratchkon.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
1900	b358b3862384f447759867e97e597d96_JaffaCakes118.exe
5024	Ratchkon.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1900	b358b3862384f447759867e97e597d96_JaffaCakes118.exe
5024	Ratchkon.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 1900 wrote to memory of 536	1900	b358b3862384f447759867e97e597d96_JaffaCakes118.exe	89
PID 1900 wrote to memory of 536	1900	b358b3862384f447759867e97e597d96_JaffaCakes118.exe	89
PID 1900 wrote to memory of 536	1900	b358b3862384f447759867e97e597d96_JaffaCakes118.exe	89
PID 1900 wrote to memory of 536	1900	b358b3862384f447759867e97e597d96_JaffaCakes118.exe	89
PID 536 wrote to memory of 5024	536	b358b3862384f447759867e97e597d96_JaffaCakes118.exe	90
PID 536 wrote to memory of 5024	536	b358b3862384f447759867e97e597d96_JaffaCakes118.exe	90
PID 536 wrote to memory of 5024	536	b358b3862384f447759867e97e597d96_JaffaCakes118.exe	90
PID 5024 wrote to memory of 3104	5024	Ratchkon.exe	93
PID 5024 wrote to memory of 3104	5024	Ratchkon.exe	93
PID 5024 wrote to memory of 3104	5024	Ratchkon.exe	93
PID 5024 wrote to memory of 3104	5024	Ratchkon.exe	93

C:\Users\Admin\AppData\Local\Temp\b358b3862384f447759867e97e597d96_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\b358b3862384f447759867e97e597d96_JaffaCakes118.exe"
1⤵
- Adds Run key to start application
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1900
- C:\Users\Admin\AppData\Local\Temp\b358b3862384f447759867e97e597d96_JaffaCakes118.exe
  "C:\Users\Admin\AppData\Local\Temp\b358b3862384f447759867e97e597d96_JaffaCakes118.exe"
  2⤵
  - Checks computer location settings
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:536
- - C:\Users\Admin\andensty\Ratchkon.exe
    "C:\Users\Admin\andensty\Ratchkon.exe"
    3⤵
    - Executes dropped EXE
    - Adds Run key to start application
    - Suspicious use of NtSetInformationThreadHideFromDebugger
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:5024
  - - C:\Users\Admin\andensty\Ratchkon.exe
      "C:\Users\Admin\andensty\Ratchkon.exe"
      4⤵
      Loads dropped DLL
      Suspicious use of NtSetInformationThreadHideFromDebugger
      System Location Discovery: System Language Discovery
      PID:3104

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

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\andensty\Ratchkon.exe

Filesize
72KB

MD5
b358b3862384f447759867e97e597d96

SHA1
43b7f92fdfe54f9359ffcca633dd1971f756d80a

SHA256
792825ddddc6373018c58825b0ddb98b1857afdc07c8dac108b27df7fb558803

SHA512
4f1950baa8ac67c0a2af5e8861ace88a0b4a141f4256421f2c2cd20f8d769c2946131c743f6cdd93e0314143a72ff41ee1128d016a834e4038f2f4dc23678e35

Download Submit
memory/536-4-0x0000000000400000-0x000000000055D000-memory.dmp

Filesize
1.4MB

Download
memory/536-8-0x00000000775E1000-0x0000000077701000-memory.dmp

Filesize
1.1MB

Download
memory/536-7-0x0000000000560000-0x0000000000660000-memory.dmp

Filesize
1024KB

Download
memory/1900-2-0x0000000002320000-0x0000000002328000-memory.dmp

Filesize
32KB

Download
memory/1900-3-0x00000000775E1000-0x0000000077701000-memory.dmp

Filesize
1.1MB

Download
memory/1900-10-0x00000000775E1000-0x0000000077701000-memory.dmp

Filesize
1.1MB

Download
memory/1900-9-0x0000000002320000-0x0000000002328000-memory.dmp

Filesize
32KB

Download
memory/3104-28-0x0000000000560000-0x0000000000660000-memory.dmp

Filesize
1024KB

Download
memory/5024-27-0x00000000006A0000-0x00000000006A8000-memory.dmp

Filesize
32KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads