3505bc92994bc33ab71bfb458177e0b8c34c7d9aed7d75f23df261d08417a168

Analysis

max time kernel
38s
max time network
6s
platform
windows7_x64
resource
win7v200430
submitted
26/06/2020, 13:11

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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

pid	Process
1500	Fx:bin
1864	Fx.exe

NTFS ADS 1 IoCs

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

pid	Process
840	vssadmin.exe

Modifies service 2 TTPs 5 IoCs

persistence

Modify Registry

T1112

Modify Existing Service

T1031

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

pid	Process
1440	sample.exe
1440	sample.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

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

Deletes itself 1 IoCs

pid	Process
1596	cmd.exe

Modifies file permissions 1 TTPs 2 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
1768	takeown.exe
1244	icacls.exe

Possible privilege escalation attempt 2 IoCs

exploit

pid	Process
1768	takeown.exe
1244	icacls.exe

Views/modifies file attributes 1 TTPs 3 IoCs

evasion

Hidden Files and Directories

T1158

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

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

description	pid	Process	procid_target
PID 1440 wrote to memory of 1500	1440	sample.exe	24
PID 1440 wrote to memory of 1500	1440	sample.exe	24
PID 1440 wrote to memory of 1500	1440	sample.exe	24
PID 1440 wrote to memory of 1500	1440	sample.exe	24
PID 1500 wrote to memory of 840	1500	Fx:bin	25
PID 1500 wrote to memory of 840	1500	Fx:bin	25
PID 1500 wrote to memory of 840	1500	Fx:bin	25
PID 1500 wrote to memory of 840	1500	Fx:bin	25
PID 1500 wrote to memory of 1768	1500	Fx:bin	29
PID 1500 wrote to memory of 1768	1500	Fx:bin	29
PID 1500 wrote to memory of 1768	1500	Fx:bin	29
PID 1500 wrote to memory of 1768	1500	Fx:bin	29
PID 1500 wrote to memory of 1244	1500	Fx:bin	31
PID 1500 wrote to memory of 1244	1500	Fx:bin	31
PID 1500 wrote to memory of 1244	1500	Fx:bin	31
PID 1500 wrote to memory of 1244	1500	Fx:bin	31
PID 1864 wrote to memory of 524	1864	Fx.exe	35
PID 1864 wrote to memory of 524	1864	Fx.exe	35
PID 1864 wrote to memory of 524	1864	Fx.exe	35
PID 1864 wrote to memory of 524	1864	Fx.exe	35
PID 1500 wrote to memory of 1624	1500	Fx:bin	37
PID 1500 wrote to memory of 1624	1500	Fx:bin	37
PID 1500 wrote to memory of 1624	1500	Fx:bin	37
PID 1500 wrote to memory of 1624	1500	Fx:bin	37
PID 1440 wrote to memory of 1596	1440	sample.exe	39
PID 1440 wrote to memory of 1596	1440	sample.exe	39
PID 1440 wrote to memory of 1596	1440	sample.exe	39
PID 1440 wrote to memory of 1596	1440	sample.exe	39
PID 524 wrote to memory of 1620	524	cmd.exe	41
PID 524 wrote to memory of 1620	524	cmd.exe	41
PID 524 wrote to memory of 1620	524	cmd.exe	41
PID 524 wrote to memory of 1620	524	cmd.exe	41
PID 1624 wrote to memory of 1548	1624	cmd.exe	42
PID 1624 wrote to memory of 1548	1624	cmd.exe	42
PID 1624 wrote to memory of 1548	1624	cmd.exe	42
PID 1624 wrote to memory of 1548	1624	cmd.exe	42
PID 1596 wrote to memory of 1928	1596	cmd.exe	43
PID 1596 wrote to memory of 1928	1596	cmd.exe	43
PID 1596 wrote to memory of 1928	1596	cmd.exe	43
PID 1596 wrote to memory of 1928	1596	cmd.exe	43
PID 524 wrote to memory of 1956	524	cmd.exe	46
PID 524 wrote to memory of 1956	524	cmd.exe	46
PID 524 wrote to memory of 1956	524	cmd.exe	46
PID 524 wrote to memory of 1956	524	cmd.exe	46
PID 1624 wrote to memory of 1960	1624	cmd.exe	44
PID 1624 wrote to memory of 1960	1624	cmd.exe	44
PID 1624 wrote to memory of 1960	1624	cmd.exe	44
PID 1624 wrote to memory of 1960	1624	cmd.exe	44
PID 1596 wrote to memory of 1932	1596	cmd.exe	45
PID 1596 wrote to memory of 1932	1596	cmd.exe	45
PID 1596 wrote to memory of 1932	1596	cmd.exe	45
PID 1596 wrote to memory of 1932	1596	cmd.exe	45

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
- - C:\Windows\SysWOW64\choice.exe
    choice /t 10 /d y
    3⤵
    PID:1620
- - C:\Windows\SysWOW64\attrib.exe
    attrib -h "C:\Windows\SysWOW64\Fx.exe"
    3⤵
    - Views/modifies file attributes
    - Drops file in System32 directory
    PID:1956

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Hidden Files and Directories

T1158

Modify Existing Service

T1031

Privilege Escalation

Defense Evasion

File Deletion

T1107

File and Directory Permissions Modification

T1222

Hidden Files and Directories

T1158

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Inhibit System Recovery

T1490

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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