gh0strat | d11df82f578e668c0baa40882fbdadb344a94bd5a544fe50a4b726f2d576b653

General

Target

300738·xlsx.exe
Size

224KB
MD5

2bdffc0196fa8fe420d450c30d3e47f9
SHA1

6751e2f6afae3c6dee6ebe82630d19e19ac7b3af
SHA256

1497ef3f6249427ac349bf5178e21d9d63aacfab84327e97bfdc4149f775b9bb
SHA512

cee9ef8d61f67273cd4a787754d78bbe655afa6064f3dccd9b08283a293524df98c56d2efd9c647c14f3a8c35b21971c9d51b7ede12b2617d0afd3db2d75f2b4
SSDEEP

3072:NJJcpg42DhdTpmrestbnZqKFUdIAP6WokM7UbGVXTYJVJhhCVh3VoCoz7pHkQ:NQpgl1dTpgeoFYBLojUbGVOSVO7F

Score

10^/10

gh0strat purplefox discovery persistence rat rootkit trojan

Malware Config

Signatures

Detect PurpleFox Rootkit 1 IoCs

Detect PurpleFox Rootkit.

rootkit

Processes:

resource	yara_rule
behavioral5/memory/2700-12-0x0000000010000000-0x00000000101A4000-memory.dmp	purplefox_rootkit

Gh0st RAT payload 1 IoCs

Processes:

resource	yara_rule
behavioral5/memory/2700-12-0x0000000010000000-0x00000000101A4000-memory.dmp	family_gh0strat

Gh0strat
Gh0st RAT is a remote access tool (RAT) with its source code public and it has been used by multiple Chinese groups.
rat gh0strat
Gh0strat family
gh0strat
PurpleFox
PurpleFox is an exploit kit used to distribute other malware families and first seen in 2018.
rootkit trojan purplefox
Purplefox family
purplefox
Downloads MZ/PE file

Executes dropped EXE 1 IoCs

Processes:

RuntimeBroker.exe

pid	Process
2700	RuntimeBroker.exe

Loads dropped DLL 2 IoCs

Processes:

300738·xlsx.exeRuntimeBroker.exe

pid	Process
2536	300738·xlsx.exe
2700	RuntimeBroker.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

RuntimeBroker.exe

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "C:\\Users\\Public\\Windows\\RuntimeBroker.exe"	RuntimeBroker.exe

Enumerates connected drives 3 TTPs 22 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

Processes:

RuntimeBroker.exe

description	ioc	Process
File opened (read-only)	\??\G:	RuntimeBroker.exe
File opened (read-only)	\??\Q:	RuntimeBroker.exe
File opened (read-only)	\??\Z:	RuntimeBroker.exe
File opened (read-only)	\??\E:	RuntimeBroker.exe
File opened (read-only)	\??\H:	RuntimeBroker.exe
File opened (read-only)	\??\J:	RuntimeBroker.exe
File opened (read-only)	\??\K:	RuntimeBroker.exe
File opened (read-only)	\??\P:	RuntimeBroker.exe
File opened (read-only)	\??\R:	RuntimeBroker.exe
File opened (read-only)	\??\B:	RuntimeBroker.exe
File opened (read-only)	\??\I:	RuntimeBroker.exe
File opened (read-only)	\??\L:	RuntimeBroker.exe
File opened (read-only)	\??\N:	RuntimeBroker.exe
File opened (read-only)	\??\O:	RuntimeBroker.exe
File opened (read-only)	\??\S:	RuntimeBroker.exe
File opened (read-only)	\??\T:	RuntimeBroker.exe
File opened (read-only)	\??\V:	RuntimeBroker.exe
File opened (read-only)	\??\Y:	RuntimeBroker.exe
File opened (read-only)	\??\M:	RuntimeBroker.exe
File opened (read-only)	\??\U:	RuntimeBroker.exe
File opened (read-only)	\??\W:	RuntimeBroker.exe
File opened (read-only)	\??\X:	RuntimeBroker.exe

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 2 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:

RuntimeBroker.exe300738·xlsx.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RuntimeBroker.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	300738·xlsx.exe

Checks processor information in registry 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

RuntimeBroker.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	RuntimeBroker.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	RuntimeBroker.exe

Suspicious behavior: EnumeratesProcesses 34 IoCs

Processes:

RuntimeBroker.exe

pid	Process
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe
2700	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

RuntimeBroker.exe

description	pid	Process
Token: 33	2700	RuntimeBroker.exe
Token: SeIncBasePriorityPrivilege	2700	RuntimeBroker.exe
Token: 33	2700	RuntimeBroker.exe
Token: SeIncBasePriorityPrivilege	2700	RuntimeBroker.exe

Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

300738·xlsx.exe

pid	Process
2536	300738·xlsx.exe
2536	300738·xlsx.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

300738·xlsx.exe

description	pid	Process	procid_target
PID 2536 wrote to memory of 2700	2536	300738·xlsx.exe	32
PID 2536 wrote to memory of 2700	2536	300738·xlsx.exe	32
PID 2536 wrote to memory of 2700	2536	300738·xlsx.exe	32
PID 2536 wrote to memory of 2700	2536	300738·xlsx.exe	32

C:\Users\Admin\AppData\Local\Temp\300738·xlsx.exe
"C:\Users\Admin\AppData\Local\Temp\300738·xlsx.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2536
- C:\Users\Public\Windows\RuntimeBroker.exe
  "C:\Users\Public\Windows\RuntimeBroker.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Adds Run key to start application
  - Enumerates connected drives
  - System Location Discovery: System Language Discovery
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2700

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

Peripheral Device Discovery

Query Registry

System Information Discovery

3

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Public\Windows\UnityPlayer.dll

Filesize
1.6MB

MD5
e88fc0397333b68de30196ff07c2a704

SHA1
d8ff5a6a136d68932d28c52fa36058808a7ac69c

SHA256
06d4ea89ca038f6b476a04aa264ea12c3e92a0241161a56cbf2090b4fef2a30e

SHA512
c613ef286c0742515e0af74c1092a2ba8e93495fe5e6947f9faa3441db3052448c453e23528edc20cae900b7b90c9934d6ed8ee5cb036b6a6eddd6000aa3d35d

Download Submit
\Users\Public\Windows\RuntimeBroker.exe

Filesize
625KB

MD5
dec397e36e9f5e8a47040adbbf04e20b

SHA1
643f2b5b37723ebc493ba6993514a4b2d9171acb

SHA256
534fd2d6da5c361831eb7fbfd1b203fbb80cd363d33f69abc4eafc384bafdc5e

SHA512
b2cdd06c044ae8b4cf7ae5c32b65f2b03f733b93061b9076cf29103da53573460c7e5d53da72220055cdafb084c63019d4a134d562a06af81c1eaad30892845b

Download Submit
memory/2700-11-0x00000000770A0000-0x0000000077176000-memory.dmp

Filesize
856KB

Download
memory/2700-12-0x0000000010000000-0x00000000101A4000-memory.dmp

Filesize
1.6MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads