e036d68b8f8b7afc6c8b6252876e1e290f11a26d4ad18ac6f310662845b2c734

General

Target

CryptoWall.exe
Size

132KB
MD5

919034c8efb9678f96b47a20fa6199f2
SHA1

747070c74d0400cffeb28fbea17b64297f14cfbd
SHA256

e036d68b8f8b7afc6c8b6252876e1e290f11a26d4ad18ac6f310662845b2c734
SHA512

745a81c50bbfd62234edb9788c83a22e0588c5d25c00881901923a02d7096c71ef5f0cd5b73f92ad974e5174de064b0c5ea8044509039aab14b2aed83735a7c4
SSDEEP

3072:naRQpzd/99wen3XgWorw8I3h8LkMvqCgQfBUnPy8L6kssU:nJdTwo30ri3h8LkMvqCgQfBUPy8L6ksP

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\2fddd325.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-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Windows\CurrentVersion\Run\2fddd32 = "C:\\2fddd325\\2fddd325.exe"	explorer.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\*fddd32 = "C:\\2fddd325\\2fddd325.exe"	explorer.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Windows\CurrentVersion\Run\2fddd325 = "C:\\Users\\Admin\\AppData\\Roaming\\2fddd325.exe"	explorer.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\*fddd325 = "C:\\Users\\Admin\\AppData\\Roaming\\2fddd325.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
3	ip-addr.es
5	myexternalip.com

System Location Discovery: System Language Discovery 1 TTPs 4 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	explorer.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vssadmin.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	CryptoWall.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
2644	vssadmin.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
2812	CryptoWall.exe
2816	explorer.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeBackupPrivilege	2808	vssvc.exe
Token: SeRestorePrivilege	2808	vssvc.exe
Token: SeAuditPrivilege	2808	vssvc.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2812 wrote to memory of 2816	2812	CryptoWall.exe	30
PID 2812 wrote to memory of 2816	2812	CryptoWall.exe	30
PID 2812 wrote to memory of 2816	2812	CryptoWall.exe	30
PID 2812 wrote to memory of 2816	2812	CryptoWall.exe	30
PID 2816 wrote to memory of 2140	2816	explorer.exe	31
PID 2816 wrote to memory of 2140	2816	explorer.exe	31
PID 2816 wrote to memory of 2140	2816	explorer.exe	31
PID 2816 wrote to memory of 2140	2816	explorer.exe	31
PID 2816 wrote to memory of 2644	2816	explorer.exe	32
PID 2816 wrote to memory of 2644	2816	explorer.exe	32
PID 2816 wrote to memory of 2644	2816	explorer.exe	32
PID 2816 wrote to memory of 2644	2816	explorer.exe	32

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⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2812
- C:\Windows\syswow64\explorer.exe
  "C:\Windows\syswow64\explorer.exe"
  2⤵
  - Drops startup file
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:2816
- - C:\Windows\syswow64\svchost.exe
    -k netsvcs
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2140
- - C:\Windows\syswow64\vssadmin.exe
    vssadmin.exe Delete Shadows /All /Quiet
    3⤵
    - System Location Discovery: System Language Discovery
    - Interacts with shadow copies
    PID:2644

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2808

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/2140-5-0x0000000000080000-0x00000000000A5000-memory.dmp

Filesize
148KB

Download
memory/2140-6-0x0000000000080000-0x00000000000A5000-memory.dmp

Filesize
148KB

Download
memory/2140-8-0x0000000000080000-0x00000000000A5000-memory.dmp

Filesize
148KB

Download
memory/2816-0-0x00000000000C0000-0x00000000000E5000-memory.dmp

Filesize
148KB

Download
memory/2816-2-0x00000000000C0000-0x00000000000E5000-memory.dmp

Filesize
148KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads