bab1853454ca6fdd3acd471254101db1b805b601e309a49ec7b4b1fbcfc47ad7

Analysis

max time kernel
131s
max time network
141s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
15/09/2024, 08:50

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General

Target
cryptowall.exe
Size 240KB
Sample240915-krmxtavfna
SHA256 45317968759d3e37282ceb75149f627d648534c5b4685f6da3966d8f6fca662d
MD5 47363b94cee907e2b8926c1be61150c7
SHA1 ca963033b9a285b8cd0044df38146a932c838071
SHA512 93dfaafc183360829448887a112dd49c90ec5fe50dcd7c7bbc06c1c8daa206eeea5577f726d906446322c731d0520e93700d5ff9cefd730fba347c72b7325068
SSDEEP 3072:xkeyloECBch6ZCGBGSmHJ0y5lj6jdojK7+MGOXpXx8z3Lp7Yoq:xGlnCIwMpj6ijKfxx8z3F0V
MD5 SHA1 SHA512 SSDEEP

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\8b7a4d25.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-1-5-21-3063565911-2056067323-3330884624-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\*b7a4d25 = "C:\\Users\\Admin\\AppData\\Roaming\\8b7a4d25.exe"	explorer.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3063565911-2056067323-3330884624-1000\Software\Microsoft\Windows\CurrentVersion\Run\8b7a4d2 = "C:\\8b7a4d25\\8b7a4d25.exe"	explorer.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3063565911-2056067323-3330884624-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\*b7a4d2 = "C:\\8b7a4d25\\8b7a4d25.exe"	explorer.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3063565911-2056067323-3330884624-1000\Software\Microsoft\Windows\CurrentVersion\Run\8b7a4d25 = "C:\\Users\\Admin\\AppData\\Roaming\\8b7a4d25.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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2904 set thread context of 2992	2904	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
580	vssadmin.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2904	cryptowall.exe
2904	cryptowall.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
2992	cryptowall.exe
2092	explorer.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: 33	2904	cryptowall.exe
Token: SeIncBasePriorityPrivilege	2904	cryptowall.exe
Token: SeBackupPrivilege	2268	vssvc.exe
Token: SeRestorePrivilege	2268	vssvc.exe
Token: SeAuditPrivilege	2268	vssvc.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 2904 wrote to memory of 2992	2904	cryptowall.exe	30
PID 2904 wrote to memory of 2992	2904	cryptowall.exe	30
PID 2904 wrote to memory of 2992	2904	cryptowall.exe	30
PID 2904 wrote to memory of 2992	2904	cryptowall.exe	30
PID 2904 wrote to memory of 2992	2904	cryptowall.exe	30
PID 2904 wrote to memory of 2992	2904	cryptowall.exe	30
PID 2904 wrote to memory of 2992	2904	cryptowall.exe	30
PID 2904 wrote to memory of 2992	2904	cryptowall.exe	30
PID 2904 wrote to memory of 2992	2904	cryptowall.exe	30
PID 2904 wrote to memory of 2992	2904	cryptowall.exe	30
PID 2992 wrote to memory of 2092	2992	cryptowall.exe	31
PID 2992 wrote to memory of 2092	2992	cryptowall.exe	31
PID 2992 wrote to memory of 2092	2992	cryptowall.exe	31
PID 2992 wrote to memory of 2092	2992	cryptowall.exe	31
PID 2092 wrote to memory of 2928	2092	explorer.exe	32
PID 2092 wrote to memory of 2928	2092	explorer.exe	32
PID 2092 wrote to memory of 2928	2092	explorer.exe	32
PID 2092 wrote to memory of 2928	2092	explorer.exe	32
PID 2092 wrote to memory of 580	2092	explorer.exe	33
PID 2092 wrote to memory of 580	2092	explorer.exe	33
PID 2092 wrote to memory of 580	2092	explorer.exe	33
PID 2092 wrote to memory of 580	2092	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:2904
- 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:2992
- - 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:2092
  - - C:\Windows\syswow64\svchost.exe
      -k netsvcs
      4⤵
      System Location Discovery: System Language Discovery
      PID:2928
  - - C:\Windows\syswow64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      4⤵
      System Location Discovery: System Language Discovery
      Interacts with shadow copies
      PID:580

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2268

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Windows Management Instrumentation

T1047

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Direct Volume Access

T1006

Indicator Removal

T1070

File Deletion

T1070.004

Modify Registry

T1112

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Inhibit System Recovery

T1490

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Downloads

memory/2092-15-0x0000000000080000-0x00000000000A5000-memory.dmp

Download

memory/2904-10-0x0000000000230000-0x0000000000246000-memory.dmp

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memory/2928-21-0x0000000000080000-0x00000000000A5000-memory.dmp

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memory/2992-0-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/2992-13-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/2992-14-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/2992-11-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

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memory/2992-8-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/2992-6-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/2992-4-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/2992-2-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/2992-16-0x0000000000400000-0x0000000000425000-memory.dmp

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