gh0strat | 90a57ca1e9d5dfff76858a0176323983de4e64a5bd2391158726869dd086146c

General

Target

90a57ca1e9d5dfff76858a0176323983de4e64a5bd2391158726869dd086146c.exe
Size

611KB
MD5

bc601387a9675a97f745c53764fddfcc
SHA1

bfb38173e1bb876b515a5e82a36fdbd7e341366a
SHA256

90a57ca1e9d5dfff76858a0176323983de4e64a5bd2391158726869dd086146c
SHA512

0179a6ec3a78ade7776a53a79bec353498aaa582705483c22c6247b2c7529940e0dd67df5f2980c5e398eb6cc18e4f42130478c582b5c502a386dae6c51af505
SSDEEP

12288:wFpuzZSkcBNrl5mTEUkDaSdJfpSaoNRVBUyMCe8VMM80B7qrI3iK1XBwZQ:wFmShDrngEUkDaiJfpSaoNRpMCe8CM8T

Score

10^/10

gh0strat purplefox discovery persistence rat rootkit trojan upx

Malware Config

Signatures

Detect PurpleFox Rootkit 4 IoCs

Detect PurpleFox Rootkit.

rootkit

resource	yara_rule
behavioral1/memory/1968-1-0x0000000010000000-0x000000001019F000-memory.dmp	purplefox_rootkit
behavioral1/memory/1968-18-0x0000000000400000-0x0000000000585000-memory.dmp	purplefox_rootkit
behavioral1/memory/2060-29-0x0000000000400000-0x0000000000585000-memory.dmp	purplefox_rootkit
behavioral1/memory/2720-39-0x0000000000400000-0x0000000000585000-memory.dmp	purplefox_rootkit

Gh0st RAT payload 4 IoCs

resource	yara_rule
behavioral1/memory/1968-1-0x0000000010000000-0x000000001019F000-memory.dmp	family_gh0strat
behavioral1/memory/1968-18-0x0000000000400000-0x0000000000585000-memory.dmp	family_gh0strat
behavioral1/memory/2060-29-0x0000000000400000-0x0000000000585000-memory.dmp	family_gh0strat
behavioral1/memory/2720-39-0x0000000000400000-0x0000000000585000-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

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File created	C:\Windows\system32\drivers\QAssist.sys	Skcsk.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\QAssist\ImagePath = "system32\\DRIVERS\\QAssist.sys"	Skcsk.exe

Deletes itself 1 IoCs

pid	Process
2908	cmd.exe

Executes dropped EXE 2 IoCs

pid	Process
2060	Skcsk.exe
2720	Skcsk.exe

Loads dropped DLL 1 IoCs

pid	Process
2060	Skcsk.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\Skcsk.exe	90a57ca1e9d5dfff76858a0176323983de4e64a5bd2391158726869dd086146c.exe
File opened for modification	C:\Windows\SysWOW64\Skcsk.exe	90a57ca1e9d5dfff76858a0176323983de4e64a5bd2391158726869dd086146c.exe

UPX packed file 6 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral1/memory/1968-0-0x0000000000400000-0x0000000000585000-memory.dmp	upx
behavioral1/files/0x0007000000012117-9.dat	upx
behavioral1/memory/2060-10-0x0000000000400000-0x0000000000585000-memory.dmp	upx
behavioral1/memory/1968-18-0x0000000000400000-0x0000000000585000-memory.dmp	upx
behavioral1/memory/2060-29-0x0000000000400000-0x0000000000585000-memory.dmp	upx
behavioral1/memory/2720-39-0x0000000000400000-0x0000000000585000-memory.dmp	upx

System Location Discovery: System Language Discovery 1 TTPs 5 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	90a57ca1e9d5dfff76858a0176323983de4e64a5bd2391158726869dd086146c.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Skcsk.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Skcsk.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
2908	cmd.exe
2820	PING.EXE

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2820	PING.EXE

Suspicious behavior: LoadsDriver 1 IoCs

pid	Process
2720	Skcsk.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeIncBasePriorityPrivilege	1968	90a57ca1e9d5dfff76858a0176323983de4e64a5bd2391158726869dd086146c.exe
Token: SeLoadDriverPrivilege	2720	Skcsk.exe
Token: 33	2720	Skcsk.exe
Token: SeIncBasePriorityPrivilege	2720	Skcsk.exe
Token: 33	2720	Skcsk.exe
Token: SeIncBasePriorityPrivilege	2720	Skcsk.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 1968 wrote to memory of 2908	1968	90a57ca1e9d5dfff76858a0176323983de4e64a5bd2391158726869dd086146c.exe	31
PID 1968 wrote to memory of 2908	1968	90a57ca1e9d5dfff76858a0176323983de4e64a5bd2391158726869dd086146c.exe	31
PID 1968 wrote to memory of 2908	1968	90a57ca1e9d5dfff76858a0176323983de4e64a5bd2391158726869dd086146c.exe	31
PID 1968 wrote to memory of 2908	1968	90a57ca1e9d5dfff76858a0176323983de4e64a5bd2391158726869dd086146c.exe	31
PID 2060 wrote to memory of 2720	2060	Skcsk.exe	33
PID 2060 wrote to memory of 2720	2060	Skcsk.exe	33
PID 2060 wrote to memory of 2720	2060	Skcsk.exe	33
PID 2060 wrote to memory of 2720	2060	Skcsk.exe	33
PID 2908 wrote to memory of 2820	2908	cmd.exe	34
PID 2908 wrote to memory of 2820	2908	cmd.exe	34
PID 2908 wrote to memory of 2820	2908	cmd.exe	34
PID 2908 wrote to memory of 2820	2908	cmd.exe	34

C:\Users\Admin\AppData\Local\Temp\90a57ca1e9d5dfff76858a0176323983de4e64a5bd2391158726869dd086146c.exe
"C:\Users\Admin\AppData\Local\Temp\90a57ca1e9d5dfff76858a0176323983de4e64a5bd2391158726869dd086146c.exe"
1⤵
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1968
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ping -n 2 127.0.0.1 > nul && del C:\Users\Admin\AppData\Local\Temp\90A57C~1.EXE > nul
  2⤵
  - Deletes itself
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:2908
- - C:\Windows\SysWOW64\PING.EXE
    ping -n 2 127.0.0.1
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:2820

C:\Windows\SysWOW64\Skcsk.exe
C:\Windows\SysWOW64\Skcsk.exe -auto
1⤵
- Executes dropped EXE
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2060
- C:\Windows\SysWOW64\Skcsk.exe
  C:\Windows\SysWOW64\Skcsk.exe -acsi
  2⤵
  - Drops file in Drivers directory
  - Sets service image path in registry
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: LoadsDriver
  - Suspicious use of AdjustPrivilegeToken
  PID:2720

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

Remote System Discovery

1

T1018

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\SysWOW64\Skcsk.exe

Filesize
611KB

MD5
bc601387a9675a97f745c53764fddfcc

SHA1
bfb38173e1bb876b515a5e82a36fdbd7e341366a

SHA256
90a57ca1e9d5dfff76858a0176323983de4e64a5bd2391158726869dd086146c

SHA512
0179a6ec3a78ade7776a53a79bec353498aaa582705483c22c6247b2c7529940e0dd67df5f2980c5e398eb6cc18e4f42130478c582b5c502a386dae6c51af505

Download Submit
memory/1968-0-0x0000000000400000-0x0000000000585000-memory.dmp

Filesize
1.5MB

Download
memory/1968-1-0x0000000010000000-0x000000001019F000-memory.dmp

Filesize
1.6MB

Download
memory/1968-18-0x0000000000400000-0x0000000000585000-memory.dmp

Filesize
1.5MB

Download
memory/2060-10-0x0000000000400000-0x0000000000585000-memory.dmp

Filesize
1.5MB

Download
memory/2060-29-0x0000000000400000-0x0000000000585000-memory.dmp

Filesize
1.5MB

Download
memory/2720-39-0x0000000000400000-0x0000000000585000-memory.dmp

Filesize
1.5MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads