3505bc92994bc33ab71bfb458177e0b8c34c7d9aed7d75f23df261d08417a168

General

Target

sample.exe
Size

56KB
MD5

ecb00e9a61f99a7d4c90723294986bbc
SHA1

be59c867da75e2a66b8c2519e950254f817cd4ad
SHA256

8897db876553f942b2eb4005f8475a232bafb82a50ca7761a621842e894a3d80
SHA512

9dee79827d865de41a63962b419eed7e1f9610ff27f00f8b7b2b9f51e905d5db907d310da590d8f1a11ac88e549373edf39bffdb44d1b205728f1b5e0a43aa5e

Score

9^/10

discovery exploit ransomware persistence

Malware Config

Signatures

Executes dropped EXE 2 IoCs

Processes:

Fx:binFx.exe

pid process

1500 Fx:bin
1864 Fx.exe
NTFS ADS 1 IoCs

Processes:

sample.exe

description ioc process

File opened for modification C:\Users\Admin\AppData\Roaming\Fx:bin sample.exe
Interacts with shadow copies 2 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
ransomware

File Deletion
T1107

Inhibit System Recovery
T1490

Processes:

vssadmin.exe

pid process

840 vssadmin.exe

pid	process
1500	Fx:bin
1864	Fx.exe

description	ioc	process
File opened for modification	C:\Users\Admin\AppData\Roaming\Fx:bin	sample.exe

pid	process
840	vssadmin.exe

Modifies service 2 TTPs 5 IoCs

persistence

Modify Registry

T1112

Modify Existing Service

T1031

Processes:

vssvc.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\VSS\Diag\SwProvider_{b5946137-7b9f-4925-af80-51abd60b20d5}	vssvc.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\VSS\Diag\COM+ REGDB Writer	vssvc.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\VSS\Diag\ASR Writer	vssvc.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\VSS\Diag\Shadow Copy Optimization Writer	vssvc.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\VSS\Diag\Registry Writer	vssvc.exe

Loads dropped DLL 2 IoCs

Processes:

sample.exe

pid process

1440 sample.exe
1440 sample.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

vssvc.exe

description pid process

Token: SeBackupPrivilege 1604 vssvc.exe
Token: SeRestorePrivilege 1604 vssvc.exe
Token: SeAuditPrivilege 1604 vssvc.exe
Deletes itself 1 IoCs

Processes:

cmd.exe

pid process

1596 cmd.exe
Modifies file permissions 1 TTPs 2 IoCs
discovery

File Permissions Modification
T1222

Processes:

takeown.exeicacls.exe

pid process

1768 takeown.exe
1244 icacls.exe
Possible privilege escalation attempt 2 IoCs
exploit

Processes:

takeown.exeicacls.exe

pid process

1768 takeown.exe
1244 icacls.exe
Views/modifies file attributes 1 TTPs 3 IoCs
evasion

Hidden Files and Directories
T1158

Processes:

attrib.exeattrib.exeattrib.exe

pid process

1960 attrib.exe
1932 attrib.exe
1956 attrib.exe
Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
ransomware

File Deletion
T1107

Inhibit System Recovery
T1490
Drops file in System32 directory 2 IoCs

Processes:

Fx:binattrib.exe

description ioc process

File opened for modification C:\Windows\SysWOW64\Fx.exe Fx:bin
File opened for modification C:\Windows\SysWOW64\Fx.exe attrib.exe

pid	process
1440	sample.exe
1440	sample.exe

description	pid	process
Token: SeBackupPrivilege	1604	vssvc.exe
Token: SeRestorePrivilege	1604	vssvc.exe
Token: SeAuditPrivilege	1604	vssvc.exe

pid	process
1596	cmd.exe

pid	process
1768	takeown.exe
1244	icacls.exe

pid	process
1768	takeown.exe
1244	icacls.exe

pid	process
1960	attrib.exe
1932	attrib.exe
1956	attrib.exe

description	ioc	process
File opened for modification	C:\Windows\SysWOW64\Fx.exe	Fx:bin
File opened for modification	C:\Windows\SysWOW64\Fx.exe	attrib.exe

Suspicious use of WriteProcessMemory 52 IoCs

Processes:

sample.exeFx:binFx.execmd.execmd.execmd.exe

description	pid	process	target process
PID 1440 wrote to memory of 1500	1440	sample.exe	Fx:bin
PID 1440 wrote to memory of 1500	1440	sample.exe	Fx:bin
PID 1440 wrote to memory of 1500	1440	sample.exe	Fx:bin
PID 1440 wrote to memory of 1500	1440	sample.exe	Fx:bin
PID 1500 wrote to memory of 840	1500	Fx:bin	vssadmin.exe
PID 1500 wrote to memory of 840	1500	Fx:bin	vssadmin.exe
PID 1500 wrote to memory of 840	1500	Fx:bin	vssadmin.exe
PID 1500 wrote to memory of 840	1500	Fx:bin	vssadmin.exe
PID 1500 wrote to memory of 1768	1500	Fx:bin	takeown.exe
PID 1500 wrote to memory of 1768	1500	Fx:bin	takeown.exe
PID 1500 wrote to memory of 1768	1500	Fx:bin	takeown.exe
PID 1500 wrote to memory of 1768	1500	Fx:bin	takeown.exe
PID 1500 wrote to memory of 1244	1500	Fx:bin	icacls.exe
PID 1500 wrote to memory of 1244	1500	Fx:bin	icacls.exe
PID 1500 wrote to memory of 1244	1500	Fx:bin	icacls.exe
PID 1500 wrote to memory of 1244	1500	Fx:bin	icacls.exe
PID 1864 wrote to memory of 524	1864	Fx.exe	cmd.exe
PID 1864 wrote to memory of 524	1864	Fx.exe	cmd.exe
PID 1864 wrote to memory of 524	1864	Fx.exe	cmd.exe
PID 1864 wrote to memory of 524	1864	Fx.exe	cmd.exe
PID 1500 wrote to memory of 1624	1500	Fx:bin	cmd.exe
PID 1500 wrote to memory of 1624	1500	Fx:bin	cmd.exe
PID 1500 wrote to memory of 1624	1500	Fx:bin	cmd.exe
PID 1500 wrote to memory of 1624	1500	Fx:bin	cmd.exe
PID 1440 wrote to memory of 1596	1440	sample.exe	cmd.exe
PID 1440 wrote to memory of 1596	1440	sample.exe	cmd.exe
PID 1440 wrote to memory of 1596	1440	sample.exe	cmd.exe
PID 1440 wrote to memory of 1596	1440	sample.exe	cmd.exe
PID 524 wrote to memory of 1620	524	cmd.exe	choice.exe
PID 524 wrote to memory of 1620	524	cmd.exe	choice.exe
PID 524 wrote to memory of 1620	524	cmd.exe	choice.exe
PID 524 wrote to memory of 1620	524	cmd.exe	choice.exe
PID 1624 wrote to memory of 1548	1624	cmd.exe	choice.exe
PID 1624 wrote to memory of 1548	1624	cmd.exe	choice.exe
PID 1624 wrote to memory of 1548	1624	cmd.exe	choice.exe
PID 1624 wrote to memory of 1548	1624	cmd.exe	choice.exe
PID 1596 wrote to memory of 1928	1596	cmd.exe	choice.exe
PID 1596 wrote to memory of 1928	1596	cmd.exe	choice.exe
PID 1596 wrote to memory of 1928	1596	cmd.exe	choice.exe
PID 1596 wrote to memory of 1928	1596	cmd.exe	choice.exe
PID 524 wrote to memory of 1956	524	cmd.exe	attrib.exe
PID 524 wrote to memory of 1956	524	cmd.exe	attrib.exe
PID 524 wrote to memory of 1956	524	cmd.exe	attrib.exe
PID 524 wrote to memory of 1956	524	cmd.exe	attrib.exe
PID 1624 wrote to memory of 1960	1624	cmd.exe	attrib.exe
PID 1624 wrote to memory of 1960	1624	cmd.exe	attrib.exe
PID 1624 wrote to memory of 1960	1624	cmd.exe	attrib.exe
PID 1624 wrote to memory of 1960	1624	cmd.exe	attrib.exe
PID 1596 wrote to memory of 1932	1596	cmd.exe	attrib.exe
PID 1596 wrote to memory of 1932	1596	cmd.exe	attrib.exe
PID 1596 wrote to memory of 1932	1596	cmd.exe	attrib.exe
PID 1596 wrote to memory of 1932	1596	cmd.exe	attrib.exe

C:\Users\Admin\AppData\Local\Temp\sample.exe
"C:\Users\Admin\AppData\Local\Temp\sample.exe"
1⤵
- NTFS ADS
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1440

C:\Users\Admin\AppData\Roaming\Fx:bin
C:\Users\Admin\AppData\Roaming\Fx:bin -r
2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:1500

C:\Windows\system32\vssadmin.exe
C:\Windows\system32\vssadmin.exe Delete Shadows /All /Quiet
3⤵
- Interacts with shadow copies
PID:840

C:\Windows\SysWOW64\takeown.exe
C:\Windows\system32\takeown.exe /F C:\Windows\system32\Fx.exe
3⤵
- Modifies file permissions
- Possible privilege escalation attempt
PID:1768

C:\Windows\SysWOW64\icacls.exe
C:\Windows\system32\icacls.exe C:\Windows\system32\Fx.exe /reset
3⤵
- Modifies file permissions
- Possible privilege escalation attempt
PID:1244

C:\Windows\SysWOW64\cmd.exe
cmd /c choice /t 10 /d y & attrib -h "C:\Users\Admin\AppData\Roaming\Fx" & del "C:\Users\Admin\AppData\Roaming\Fx"
3⤵
- Suspicious use of WriteProcessMemory
PID:1624

C:\Windows\SysWOW64\choice.exe
choice /t 10 /d y
4⤵
PID:1548

C:\Windows\SysWOW64\attrib.exe
attrib -h "C:\Users\Admin\AppData\Roaming\Fx"
4⤵
- Views/modifies file attributes
PID:1960

C:\Windows\SysWOW64\cmd.exe
cmd /c choice /t 10 /d y & attrib -h "C:\Users\Admin\AppData\Local\Temp\sample.exe" & del "C:\Users\Admin\AppData\Local\Temp\sample.exe"
2⤵
- Deletes itself
- Suspicious use of WriteProcessMemory
PID:1596

C:\Windows\SysWOW64\choice.exe
choice /t 10 /d y
3⤵
PID:1928

C:\Windows\SysWOW64\attrib.exe
attrib -h "C:\Users\Admin\AppData\Local\Temp\sample.exe"
3⤵
- Views/modifies file attributes
PID:1932

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Modifies service
- Suspicious use of AdjustPrivilegeToken
PID:1604

C:\Windows\SysWOW64\Fx.exe
C:\Windows\SysWOW64\Fx.exe -s
1⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:1864

C:\Windows\SysWOW64\cmd.exe
cmd /c choice /t 10 /d y & attrib -h "C:\Windows\SysWOW64\Fx.exe" & del "C:\Windows\SysWOW64\Fx.exe"
2⤵
- Suspicious use of WriteProcessMemory
PID:524