5fa4cbe0983a59dddd8a58c33a5cebcc0742c24f59c08f1cf78deebca0672697

General

Target

cryptowall.exe
Size

240KB
MD5

47363b94cee907e2b8926c1be61150c7
SHA1

ca963033b9a285b8cd0044df38146a932c838071
SHA256

45317968759d3e37282ceb75149f627d648534c5b4685f6da3966d8f6fca662d
SHA512

93dfaafc183360829448887a112dd49c90ec5fe50dcd7c7bbc06c1c8daa206eeea5577f726d906446322c731d0520e93700d5ff9cefd730fba347c72b7325068
SSDEEP

3072:xkeyloECBch6ZCGBGSmHJ0y5lj6jdojK7+MGOXpXx8z3Lp7Yoq:xGlnCIwMpj6ijKfxx8z3F0V

Score

9^/10

defense_evasion discovery execution impact persistence ransomware

Malware Config

Signatures

Deletes shadow copies 3 TTPs
Ransomware often targets backup files to inhibit system recovery.
ransomware defense_evasion impact execution

File Deletion
T1070.004

Inhibit System Recovery
T1490

Windows Management Instrumentation
T1047

Drops startup file 1 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\8716cf32.exe	explorer.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\Run\8716cf32 = "C:\\Users\\Admin\\AppData\\Roaming\\8716cf32.exe"	explorer.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\*716cf32 = "C:\\Users\\Admin\\AppData\\Roaming\\8716cf32.exe"	explorer.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\Run\8716cf3 = "C:\\8716cf32\\8716cf32.exe"	explorer.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\*716cf3 = "C:\\8716cf32\\8716cf32.exe"	explorer.exe

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
5	myexternalip.com
3	ip-addr.es

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2640 set thread context of 2660	2640	cryptowall.exe	30

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	cryptowall.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cryptowall.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	explorer.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vssadmin.exe

Interacts with shadow copies 3 TTPs 1 IoCs

Shadow copies are often targeted by ransomware to inhibit system recovery.

ransomware

File Deletion

T1070.004

Inhibit System Recovery

T1490

Direct Volume Access

T1006

pid	Process
2668	vssadmin.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2640	cryptowall.exe
2640	cryptowall.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
2660	cryptowall.exe
2812	explorer.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: 33	2640	cryptowall.exe
Token: SeIncBasePriorityPrivilege	2640	cryptowall.exe
Token: SeBackupPrivilege	2540	vssvc.exe
Token: SeRestorePrivilege	2540	vssvc.exe
Token: SeAuditPrivilege	2540	vssvc.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 2640 wrote to memory of 2660	2640	cryptowall.exe	30
PID 2640 wrote to memory of 2660	2640	cryptowall.exe	30
PID 2640 wrote to memory of 2660	2640	cryptowall.exe	30
PID 2640 wrote to memory of 2660	2640	cryptowall.exe	30
PID 2640 wrote to memory of 2660	2640	cryptowall.exe	30
PID 2640 wrote to memory of 2660	2640	cryptowall.exe	30
PID 2640 wrote to memory of 2660	2640	cryptowall.exe	30
PID 2640 wrote to memory of 2660	2640	cryptowall.exe	30
PID 2640 wrote to memory of 2660	2640	cryptowall.exe	30
PID 2640 wrote to memory of 2660	2640	cryptowall.exe	30
PID 2660 wrote to memory of 2812	2660	cryptowall.exe	31
PID 2660 wrote to memory of 2812	2660	cryptowall.exe	31
PID 2660 wrote to memory of 2812	2660	cryptowall.exe	31
PID 2660 wrote to memory of 2812	2660	cryptowall.exe	31
PID 2812 wrote to memory of 2420	2812	explorer.exe	32
PID 2812 wrote to memory of 2420	2812	explorer.exe	32
PID 2812 wrote to memory of 2420	2812	explorer.exe	32
PID 2812 wrote to memory of 2420	2812	explorer.exe	32
PID 2812 wrote to memory of 2668	2812	explorer.exe	33
PID 2812 wrote to memory of 2668	2812	explorer.exe	33
PID 2812 wrote to memory of 2668	2812	explorer.exe	33
PID 2812 wrote to memory of 2668	2812	explorer.exe	33

Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
ransomware

C:\Users\Admin\AppData\Local\Temp\cryptowall.exe
"C:\Users\Admin\AppData\Local\Temp\cryptowall.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2640
- C:\Users\Admin\AppData\Local\Temp\cryptowall.exe
  "C:\Users\Admin\AppData\Local\Temp\cryptowall.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:2660
- - C:\Windows\syswow64\explorer.exe
    "C:\Windows\syswow64\explorer.exe"
    3⤵
    - Drops startup file
    - Adds Run key to start application
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of WriteProcessMemory
    PID:2812
  - - C:\Windows\syswow64\svchost.exe
      -k netsvcs
      4⤵
      System Location Discovery: System Language Discovery
      PID:2420
  - - C:\Windows\syswow64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      4⤵
      System Location Discovery: System Language Discovery
      Interacts with shadow copies
      PID:2668

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2540

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Windows Management Instrumentation

1

T1047

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

Direct Volume Access

1

T1006

Indicator Removal

2

T1070

File Deletion

Modify Registry

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Inhibit System Recovery

2

T1490

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Downloads

memory/2420-21-0x0000000000080000-0x00000000000A5000-memory.dmp

Filesize
148KB

Download
memory/2640-20-0x0000000000400000-0x00000000037E7000-memory.dmp

Filesize
51.9MB

Download
memory/2640-23-0x0000000000400000-0x00000000037E7000-memory.dmp

Filesize
51.9MB

Download
memory/2660-6-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/2660-14-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/2660-10-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2660-4-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/2660-0-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/2660-2-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/2660-16-0x0000000000401000-0x0000000000418000-memory.dmp

Filesize
92KB

Download
memory/2660-8-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/2660-12-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/2812-13-0x0000000000080000-0x00000000000A5000-memory.dmp

Filesize
148KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads