mercurialgrabber | hxxps://github[.]com/xsplitst/RGF/blob/main/RBF[.]exe

Virtualization/Sandbox Evasion

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

Downloads MZ/PE file

Looks for VMWare Tools registry key 2 TTPs 2 IoCs

evasion

Query Registry

Virtualization/Sandbox Evasion

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

Checks BIOS information in registry 2 TTPs 2 IoCs

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

Query Registry

System Information Discovery

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

Executes dropped EXE 2 IoCs

pid	Process
1776	RBF.exe
2116	RBF.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

Legitimate hosting services abused for malware hosting/C2 1 TTPs 5 IoCs

Web Service

T1102

flow	ioc
40	raw.githubusercontent.com
41	raw.githubusercontent.com
73	discord.com
74	discord.com
79	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.

flow	ioc
48	ip4.seeip.org
71	ip-api.com

Maps connected drives based on registry 3 TTPs 4 IoCs

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

Query Registry

Peripheral Device Discovery

T1120

System Information Discovery

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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	RBF.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	RBF.exe

Browser Information Discovery 1 TTPs
Enumerate browser information.
discovery

Browser Information Discovery
T1217

Checks SCSI registry key(s) 3 TTPs 2 IoCs

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

Query Registry

Peripheral Device Discovery

T1120

System Information Discovery

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

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

Enumerates system info in registry 2 TTPs 11 IoCs

Query Registry

System Information Discovery

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

NTFS ADS 1 IoCs

description	ioc	Process
File opened for modification	C:\Users\Admin\Downloads\Unconfirmed 438746.crdownload:SmartScreen	msedge.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
3532	msedge.exe
3532	msedge.exe
1360	msedge.exe
1360	msedge.exe
2640	identity_helper.exe
2640	identity_helper.exe
3844	msedge.exe
3844	msedge.exe

Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary 7 IoCs

pid	Process
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1776	RBF.exe
Token: SeDebugPrivilege	2116	RBF.exe

Suspicious use of FindShellTrayWindow 35 IoCs

pid	Process
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe

Suspicious use of SendNotifyMessage 24 IoCs

pid	Process
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe
1360	msedge.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 1360 wrote to memory of 1480	1360	msedge.exe	83
PID 1360 wrote to memory of 1480	1360	msedge.exe	83
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 2696	1360	msedge.exe	85
PID 1360 wrote to memory of 3532	1360	msedge.exe	86
PID 1360 wrote to memory of 3532	1360	msedge.exe	86
PID 1360 wrote to memory of 5024	1360	msedge.exe	87
PID 1360 wrote to memory of 5024	1360	msedge.exe	87
PID 1360 wrote to memory of 5024	1360	msedge.exe	87
PID 1360 wrote to memory of 5024	1360	msedge.exe	87
PID 1360 wrote to memory of 5024	1360	msedge.exe	87
PID 1360 wrote to memory of 5024	1360	msedge.exe	87
PID 1360 wrote to memory of 5024	1360	msedge.exe	87
PID 1360 wrote to memory of 5024	1360	msedge.exe	87
PID 1360 wrote to memory of 5024	1360	msedge.exe	87
PID 1360 wrote to memory of 5024	1360	msedge.exe	87
PID 1360 wrote to memory of 5024	1360	msedge.exe	87
PID 1360 wrote to memory of 5024	1360	msedge.exe	87
PID 1360 wrote to memory of 5024	1360	msedge.exe	87
PID 1360 wrote to memory of 5024	1360	msedge.exe	87
PID 1360 wrote to memory of 5024	1360	msedge.exe	87
PID 1360 wrote to memory of 5024	1360	msedge.exe	87
PID 1360 wrote to memory of 5024	1360	msedge.exe	87
PID 1360 wrote to memory of 5024	1360	msedge.exe	87
PID 1360 wrote to memory of 5024	1360	msedge.exe	87
PID 1360 wrote to memory of 5024	1360	msedge.exe	87

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --start-maximized --single-argument https://github.com/xsplitst/RGF/blob/main/RBF.exe
1⤵
- Enumerates system info in registry
- NTFS ADS
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1360
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=crashpad-handler "--user-data-dir=C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data" /prefetch:7 --monitor-self-annotation=ptype=crashpad-handler "--database=C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Crashpad" "--metrics-dir=C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data" --annotation=IsOfficialBuild=1 --annotation=channel= --annotation=chromium-version=92.0.4515.131 "--annotation=exe=C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --annotation=plat=Win64 "--annotation=prod=Microsoft Edge" --annotation=ver=92.0.902.67 --initial-client-data=0xfc,0x100,0x104,0xd8,0x108,0x7ff95bb446f8,0x7ff95bb44708,0x7ff95bb44718
  2⤵
  PID:1480
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=gpu-process --field-trial-handle=1984,6039944772596593621,18332283087694583762,131072 --gpu-preferences=UAAAAAAAAADgAAAQAAAAAAAAAAAAAAAAAABgAAAAAAAwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAHgAAAAAAAAAeAAAAAAAAAAoAAAABAAAACAAAAAAAAAAKAAAAAAAAAAwAAAAAAAAADgAAAAAAAAAEAAAAAAAAAAAAAAADQAAABAAAAAAAAAAAQAAAA0AAAAQAAAAAAAAAAQAAAANAAAAEAAAAAAAAAAHAAAADQAAAAgAAAAAAAAACAAAAAAAAAA= --mojo-platform-channel-handle=2060 /prefetch:2
  2⤵
  PID:2696
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=network.mojom.NetworkService --field-trial-handle=1984,6039944772596593621,18332283087694583762,131072 --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=2152 /prefetch:3
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:3532
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=storage.mojom.StorageService --field-trial-handle=1984,6039944772596593621,18332283087694583762,131072 --lang=en-US --service-sandbox-type=utility --mojo-platform-channel-handle=2656 /prefetch:8
  2⤵
  PID:5024
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=1984,6039944772596593621,18332283087694583762,131072 --lang=en-US --disable-client-side-phishing-detection --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=6 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=3344 /prefetch:1
  2⤵
  PID:5000
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=1984,6039944772596593621,18332283087694583762,131072 --lang=en-US --disable-client-side-phishing-detection --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=5 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=3352 /prefetch:1
  2⤵
  PID:3032
- C:\Program Files (x86)\Microsoft\Edge\Application\92.0.902.67\identity_helper.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\92.0.902.67\identity_helper.exe" --type=utility --utility-sub-type=winrt_app_id.mojom.WinrtAppIdService --field-trial-handle=1984,6039944772596593621,18332283087694583762,131072 --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=5504 /prefetch:8
  2⤵
  PID:776
- C:\Program Files (x86)\Microsoft\Edge\Application\92.0.902.67\identity_helper.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\92.0.902.67\identity_helper.exe" --type=utility --utility-sub-type=winrt_app_id.mojom.WinrtAppIdService --field-trial-handle=1984,6039944772596593621,18332283087694583762,131072 --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=5504 /prefetch:8
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:2640
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=edge_collections.mojom.CollectionsDataManager --field-trial-handle=1984,6039944772596593621,18332283087694583762,131072 --lang=en-US --service-sandbox-type=collections --mojo-platform-channel-handle=4180 /prefetch:8
  2⤵
  PID:3648
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=1984,6039944772596593621,18332283087694583762,131072 --lang=en-US --disable-client-side-phishing-detection --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=10 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=5812 /prefetch:1
  2⤵
  PID:372
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=chrome.mojom.UtilReadIcon --field-trial-handle=1984,6039944772596593621,18332283087694583762,131072 --lang=en-US --service-sandbox-type=icon_reader --mojo-platform-channel-handle=6152 /prefetch:8
  2⤵
  PID:1872
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=quarantine.mojom.Quarantine --field-trial-handle=1984,6039944772596593621,18332283087694583762,131072 --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=5196 /prefetch:8
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:3844
- C:\Users\Admin\Downloads\RBF.exe
  "C:\Users\Admin\Downloads\RBF.exe"
  2⤵
  - Looks for VirtualBox Guest Additions in registry
  - Looks for VMWare Tools registry key
  - Checks BIOS information in registry
  - Executes dropped EXE
  - 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
  PID:1776
- C:\Users\Admin\Downloads\RBF.exe
  "C:\Users\Admin\Downloads\RBF.exe"
  2⤵
  - Looks for VirtualBox Guest Additions in registry
  - Looks for VMWare Tools registry key
  - Checks BIOS information in registry
  - Executes dropped EXE
  - Maps connected drives based on registry
  - Checks SCSI registry key(s)
  - Enumerates system info in registry
  - Suspicious use of AdjustPrivilegeToken
  PID:2116
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=1984,6039944772596593621,18332283087694583762,131072 --lang=en-US --disable-client-side-phishing-detection --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=13 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=3524 /prefetch:1
  2⤵
  PID:4200
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=1984,6039944772596593621,18332283087694583762,131072 --lang=en-US --disable-client-side-phishing-detection --instant-process --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=14 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=4852 /prefetch:1
  2⤵
  PID:2948
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=1984,6039944772596593621,18332283087694583762,131072 --lang=en-US --disable-client-side-phishing-detection --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=15 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=3552 /prefetch:1
  2⤵
  PID:5220
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=1984,6039944772596593621,18332283087694583762,131072 --lang=en-US --disable-client-side-phishing-detection --instant-process --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=16 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=6172 /prefetch:1
  2⤵
  PID:5228

C:\Windows\System32\CompPkgSrv.exe
C:\Windows\System32\CompPkgSrv.exe -Embedding
1⤵
PID:4568

C:\Windows\System32\CompPkgSrv.exe
C:\Windows\System32\CompPkgSrv.exe -Embedding
1⤵
PID:2924

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Browser Information Discovery

T1217

Peripheral Device Discovery

T1120

Query Registry

System Information Discovery

Virtualization/Sandbox Evasion