4e7b6aad7dbf0d6064d008570202135e602610b7e4c7d61d53ab7df83335c21c

General

Target

FishLocker.bin.exe
Size

218KB
MD5

85d90010fed526eef947c440629b82dd
SHA1

1df270d02c9ea53f180130e7a219b40146cfca10
SHA256

117b0078905f0929a5da0b24e20c76bbaa99151f56789c63b4498143c2261926
SHA512

1455958c884f15e03531b1e836269fc6b2bab60e1a4b360e1206568ca7aabee0f55599eab4d11889359818c859d8d37d725bd90109165ca7626d045a81e75be7

Score

10^/10

discovery evasion exploit persistence

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 1 IoCs
persistence

Winlogon Helper DLL
T1004

Modify Registry
T1112

Processes:

FishLocker.bin.exe

description ioc process

Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "empty" FishLocker.bin.exe
Disables Task Manager via registry modification
evasion
Possible privilege escalation attempt 4 IoCs
exploit

Processes:

icacls.exetakeown.exeicacls.exetakeown.exe

pid process

2808 icacls.exe
2988 takeown.exe
1996 icacls.exe
3828 takeown.exe
Modifies file permissions 1 TTPs 4 IoCs
discovery

File Permissions Modification
T1222

Processes:

icacls.exetakeown.exeicacls.exetakeown.exe

pid process

1996 icacls.exe
3828 takeown.exe
2808 icacls.exe
2988 takeown.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

3108 3932 WerFault.exe FishLocker.bin.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "empty"	FishLocker.bin.exe

pid	process
2808	icacls.exe
2988	takeown.exe
1996	icacls.exe
3828	takeown.exe

pid	process
1996	icacls.exe
3828	takeown.exe
2808	icacls.exe
2988	takeown.exe

pid	pid_target	process	target process
3108	3932	WerFault.exe	FishLocker.bin.exe

Suspicious behavior: EnumeratesProcesses 16 IoCs

Processes:

FishLocker.bin.exeWerFault.exe

pid	process
3932	FishLocker.bin.exe
3108	WerFault.exe
3108	WerFault.exe
3108	WerFault.exe
3108	WerFault.exe
3108	WerFault.exe
3108	WerFault.exe
3108	WerFault.exe
3108	WerFault.exe
3108	WerFault.exe
3108	WerFault.exe
3108	WerFault.exe
3108	WerFault.exe
3108	WerFault.exe
3108	WerFault.exe
3108	WerFault.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

Processes:

FishLocker.bin.exetakeown.exetakeown.exeWerFault.exe

description	pid	process
Token: SeDebugPrivilege	3932	FishLocker.bin.exe
Token: SeDebugPrivilege	3932	FishLocker.bin.exe
Token: SeTakeOwnershipPrivilege	3828	takeown.exe
Token: SeTakeOwnershipPrivilege	2988	takeown.exe
Token: SeShutdownPrivilege	3108	WerFault.exe
Token: SeDebugPrivilege	3108	WerFault.exe

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

FishLocker.bin.execmd.exe

description	pid	process	target process
PID 3932 wrote to memory of 2524	3932	FishLocker.bin.exe	cmd.exe
PID 3932 wrote to memory of 2524	3932	FishLocker.bin.exe	cmd.exe
PID 2524 wrote to memory of 3828	2524	cmd.exe	takeown.exe
PID 2524 wrote to memory of 3828	2524	cmd.exe	takeown.exe
PID 2524 wrote to memory of 2808	2524	cmd.exe	icacls.exe
PID 2524 wrote to memory of 2808	2524	cmd.exe	icacls.exe
PID 2524 wrote to memory of 2988	2524	cmd.exe	takeown.exe
PID 2524 wrote to memory of 2988	2524	cmd.exe	takeown.exe
PID 2524 wrote to memory of 1996	2524	cmd.exe	icacls.exe
PID 2524 wrote to memory of 1996	2524	cmd.exe	icacls.exe

C:\Users\Admin\AppData\Local\Temp\FishLocker.bin.exe
"C:\Users\Admin\AppData\Local\Temp\FishLocker.bin.exe"
1⤵
- Modifies WinLogon for persistence
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3932

C:\Windows\System32\cmd.exe
"C:\Windows\System32\cmd.exe" /k color 47 && takeown /f C:\Windows\System32 && icacls C:\Windows\System32 /grant %username%:F && takeown /f C:\Windows\System32\drivers && icacls C:\Windows\System32\drivers /grant %username%:F && Exit
2⤵
- Suspicious use of WriteProcessMemory
PID:2524

C:\Windows\system32\takeown.exe
takeown /f C:\Windows\System32
3⤵
- Possible privilege escalation attempt
- Modifies file permissions
- Suspicious use of AdjustPrivilegeToken
PID:3828

C:\Windows\system32\icacls.exe
icacls C:\Windows\System32 /grant Admin:F
3⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:2808

C:\Windows\system32\takeown.exe
takeown /f C:\Windows\System32\drivers
3⤵
- Possible privilege escalation attempt
- Modifies file permissions
- Suspicious use of AdjustPrivilegeToken
PID:2988

C:\Windows\system32\icacls.exe
icacls C:\Windows\System32\drivers /grant Admin:F
3⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:1996

C:\Windows\system32\WerFault.exe
C:\Windows\system32\WerFault.exe -u -p 3932 -s 1260
2⤵
- Program crash
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3108

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

1

T1004

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

File Permissions Modification

1

T1222

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

memory/1996-124-0x0000000000000000-mapping.dmp

Download
memory/2524-117-0x0000000000000000-mapping.dmp

Download
memory/2808-121-0x0000000000000000-mapping.dmp

Download
memory/2988-123-0x0000000000000000-mapping.dmp

Download
memory/3828-118-0x0000000000000000-mapping.dmp

Download
memory/3932-119-0x000000001BD12000-0x000000001BD14000-memory.dmp

Filesize
8KB

Download
memory/3932-120-0x000000001BD14000-0x000000001BD15000-memory.dmp

Filesize
4KB

Download
memory/3932-114-0x0000000000740000-0x0000000000741000-memory.dmp

Filesize
4KB

Download
memory/3932-122-0x000000001BD15000-0x000000001BD17000-memory.dmp

Filesize
8KB

Download
memory/3932-116-0x000000001BD10000-0x000000001BD12000-memory.dmp

Filesize
8KB

Download
memory/3932-125-0x000000001BD17000-0x000000001BD19000-memory.dmp

Filesize
8KB

Download
memory/3932-126-0x000000001BD19000-0x000000001BD1F000-memory.dmp

Filesize
24KB

Download
memory/3932-127-0x0000000000D60000-0x0000000000D64000-memory.dmp

Filesize
16KB

Download
memory/3932-128-0x0000000000D64000-0x0000000000D67000-memory.dmp

Filesize
12KB

Download
memory/3932-129-0x0000000000D67000-0x0000000000D6C000-memory.dmp

Filesize
20KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

Loading Replay Monitor...

Downloads