mercurialgrabber | hxxps://github[.]com/xsplitst/RGF/archive/refs/heads/main[.]zip

Virtualization/Sandbox Evasion

Processes:

RBF.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\Oracle\VirtualBox Guest Additions	RBF.exe

Looks for VMWare Tools registry key 2 TTPs 1 IoCs

evasion

Query Registry

Virtualization/Sandbox Evasion

Processes:

RBF.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\VMWare, Inc.\VMWare Tools	RBF.exe

Checks BIOS information in registry 2 TTPs 1 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

System Information Discovery

Processes:

RBF.exe

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	RBF.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 3 IoCs

Web Service

T1102

Processes:

flow	ioc
36	discord.com
37	discord.com
38	discord.com

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow	ioc
26	ip4.seeip.org
34	ip-api.com

Maps connected drives based on registry 3 TTPs 2 IoCs

Disk information is often read in order to detect sandboxing environments.

Query Registry

Peripheral Device Discovery

T1120

System Information Discovery

Processes:

RBF.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	RBF.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	RBF.exe

System Location Discovery: System Language Discovery 1 TTPs 1 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

Processes:

IEXPLORE.EXE

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	IEXPLORE.EXE

Checks SCSI registry key(s) 3 TTPs 1 IoCs

SCSI information is often read in order to detect sandboxing environments.

Query Registry

Peripheral Device Discovery

T1120

System Information Discovery

Processes:

RBF.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_VMware_&Prod_VMware_Virtual_S	RBF.exe

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

System Information Discovery

Processes:

RBF.exe

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	RBF.exe
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	RBF.exe

Enumerates system info in registry 2 TTPs 4 IoCs

Query Registry

System Information Discovery

Processes:

RBF.exe

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosInformation	RBF.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemManufacturer	RBF.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemProductName	RBF.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Logical Unit Id 0	RBF.exe

Modifies Internet Explorer Phishing Filter 1 TTPs 2 IoCs

Modify Registry

T1112

Processes:

iexplore.exe

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\PhishingFilter	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\PhishingFilter\ClientSupported_MigrationTime = 6024e80b89efda01	iexplore.exe

Modifies Internet Explorer settings 1 TTPs 27 IoCs

adware spyware

Modify Registry

T1112

Processes:

iexplore.exeIEXPLORE.EXE

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\Main	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\LowRegistry\DOMStorage	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\PageSetup	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\Main\Window_Placement = 2c0000000200000003000000ffffffffffffffffffffffffffffffff2400000024000000aa04000089020000	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\Recovery\PendingRecovery\AdminActive = "0"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\MINIE\TabBandWidth = "500"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\Zoom	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\Main	IEXPLORE.EXE
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\Toolbar\WebBrowser	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\Main\DownloadWindowPlacement = 2c0000000000000000000000ffffffffffffffffffffffffffffffffd90000004b000000590300002b020000	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\GPU	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\LowRegistry	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\LowRegistry\DontShowMeThisDialogAgain	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\Toolbar	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\Main\CompatibilityFlags = "0"	iexplore.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running"	iexplore.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\Main\FullScreen = "no"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\Recovery\PendingRecovery	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\IETld\LowMic	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\IntelliForms	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\MINIE	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\InternetRegistry	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\Recovery\AdminActive\{46BD6B91-5B7C-11EF-8153-46FE39DD2993} = "0"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\Recovery\PendingRecovery\AdminActive = "1"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\BrowserEmulation\LowMic	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Internet Explorer\Recovery\AdminActive	iexplore.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

RBF.exe

description	pid	Process
Token: SeDebugPrivilege	1920	RBF.exe

Suspicious use of FindShellTrayWindow 3 IoCs

Processes:

iexplore.exe

pid	Process
3032	iexplore.exe
3032	iexplore.exe
3032	iexplore.exe

Suspicious use of SetWindowsHookEx 4 IoCs

Processes:

iexplore.exeIEXPLORE.EXE

pid	Process
3032	iexplore.exe
3032	iexplore.exe
2400	IEXPLORE.EXE
2400	IEXPLORE.EXE

Suspicious use of WriteProcessMemory 7 IoCs

Processes:

iexplore.exeRBF.exe

description	pid	Process	procid_target
PID 3032 wrote to memory of 2400	3032	iexplore.exe	30
PID 3032 wrote to memory of 2400	3032	iexplore.exe	30
PID 3032 wrote to memory of 2400	3032	iexplore.exe	30
PID 3032 wrote to memory of 2400	3032	iexplore.exe	30
PID 1920 wrote to memory of 2468	1920	RBF.exe	37
PID 1920 wrote to memory of 2468	1920	RBF.exe	37
PID 1920 wrote to memory of 2468	1920	RBF.exe	37

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012
Uses Volume Shadow Copy WMI provider
The Volume Shadow Copy service is used to manage backups/snapshots.
ransomware
Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
ransomware

C:\Program Files\Internet Explorer\iexplore.exe
"C:\Program Files\Internet Explorer\iexplore.exe" https://github.com/xsplitst/RGF/archive/refs/heads/main.zip
1⤵
- Modifies Internet Explorer Phishing Filter
- Modifies Internet Explorer settings
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3032
- C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE
  "C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:3032 CREDAT:275457 /prefetch:2
  2⤵
  - System Location Discovery: System Language Discovery
  - Modifies Internet Explorer settings
  - Suspicious use of SetWindowsHookEx
  PID:2400

C:\Users\Admin\Documents\RGF-main\RGF-main\RBF.exe
"C:\Users\Admin\Documents\RGF-main\RGF-main\RBF.exe"
1⤵
- Looks for VirtualBox Guest Additions in registry
- Looks for VMWare Tools registry key
- Checks BIOS information in registry
- Maps connected drives based on registry
- Checks SCSI registry key(s)
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1920
- C:\Windows\system32\WerFault.exe
  C:\Windows\system32\WerFault.exe -u -p 1920 -s 1244
  2⤵
  PID:2468

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

2

T1112

Virtualization/Sandbox Evasion

2

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

5

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Virtualization/Sandbox Evasion

2