bab1853454ca6fdd3acd471254101db1b805b601e309a49ec7b4b1fbcfc47ad7

Resubmissions

21-02-2024 14:33

240221-rw8hmsha2y 10

21-02-2024 14:31

240221-rvtm4agh7w 10

21-02-2024 11:52

240221-n1xedseg6t 10

Analysis

max time kernel
148s
max time network
150s
platform
windows7_x64
resource
win7-20240220-en
resource tags

arch:x64arch:x86image:win7-20240220-enlocale:en-usos:windows7-x64system
submitted
21-02-2024 14:31

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General

Target

cryptowall.exe
Size

240KB
MD5

47363b94cee907e2b8926c1be61150c7
SHA1

ca963033b9a285b8cd0044df38146a932c838071
SHA256

45317968759d3e37282ceb75149f627d648534c5b4685f6da3966d8f6fca662d
SHA512

93dfaafc183360829448887a112dd49c90ec5fe50dcd7c7bbc06c1c8daa206eeea5577f726d906446322c731d0520e93700d5ff9cefd730fba347c72b7325068
SSDEEP

3072:xkeyloECBch6ZCGBGSmHJ0y5lj6jdojK7+MGOXpXx8z3Lp7Yoq:xGlnCIwMpj6ijKfxx8z3F0V

Score

9^/10

persistence ransomware

Malware Config

Signatures

Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
ransomware

File Deletion
T1070.004

Inhibit System Recovery
T1490
Drops startup file 1 IoCs

Processes:

explorer.exe

description ioc process

File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\2a854004.exe explorer.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\2a854004.exe	explorer.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

explorer.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Windows\CurrentVersion\Run\2a85400 = "C:\\2a854004\\2a854004.exe"	explorer.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\*a85400 = "C:\\2a854004\\2a854004.exe"	explorer.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Windows\CurrentVersion\Run\2a854004 = "C:\\Users\\Admin\\AppData\\Roaming\\2a854004.exe"	explorer.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\*a854004 = "C:\\Users\\Admin\\AppData\\Roaming\\2a854004.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.

Processes:

flow ioc

3 ip-addr.es
5 myexternalip.com
Suspicious use of SetThreadContext 1 IoCs

Processes:

cryptowall.exe

description pid process target process

PID 836 set thread context of 1688 836 cryptowall.exe cryptowall.exe
Interacts with shadow copies 2 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
ransomware

File Deletion
T1070.004

Inhibit System Recovery
T1490

Processes:

vssadmin.exe

pid process

2776 vssadmin.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

cryptowall.exe

pid process

836 cryptowall.exe
836 cryptowall.exe
Suspicious behavior: MapViewOfSection 2 IoCs

Processes:

cryptowall.exeexplorer.exe

pid process

1688 cryptowall.exe
3004 explorer.exe

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

description	pid	process	target process
PID 836 set thread context of 1688	836	cryptowall.exe	cryptowall.exe

pid	process
2776	vssadmin.exe

pid	process
836	cryptowall.exe
836	cryptowall.exe

pid	process
1688	cryptowall.exe
3004	explorer.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

Processes:

cryptowall.exevssvc.exe

description	pid	process
Token: 33	836	cryptowall.exe
Token: SeIncBasePriorityPrivilege	836	cryptowall.exe
Token: SeBackupPrivilege	2564	vssvc.exe
Token: SeRestorePrivilege	2564	vssvc.exe
Token: SeAuditPrivilege	2564	vssvc.exe

Suspicious use of WriteProcessMemory 22 IoCs

Processes:

cryptowall.execryptowall.exeexplorer.exe

description	pid	process	target process
PID 836 wrote to memory of 1688	836	cryptowall.exe	cryptowall.exe
PID 836 wrote to memory of 1688	836	cryptowall.exe	cryptowall.exe
PID 836 wrote to memory of 1688	836	cryptowall.exe	cryptowall.exe
PID 836 wrote to memory of 1688	836	cryptowall.exe	cryptowall.exe
PID 836 wrote to memory of 1688	836	cryptowall.exe	cryptowall.exe
PID 836 wrote to memory of 1688	836	cryptowall.exe	cryptowall.exe
PID 836 wrote to memory of 1688	836	cryptowall.exe	cryptowall.exe
PID 836 wrote to memory of 1688	836	cryptowall.exe	cryptowall.exe
PID 836 wrote to memory of 1688	836	cryptowall.exe	cryptowall.exe
PID 836 wrote to memory of 1688	836	cryptowall.exe	cryptowall.exe
PID 1688 wrote to memory of 3004	1688	cryptowall.exe	explorer.exe
PID 1688 wrote to memory of 3004	1688	cryptowall.exe	explorer.exe
PID 1688 wrote to memory of 3004	1688	cryptowall.exe	explorer.exe
PID 1688 wrote to memory of 3004	1688	cryptowall.exe	explorer.exe
PID 3004 wrote to memory of 2604	3004	explorer.exe	svchost.exe
PID 3004 wrote to memory of 2604	3004	explorer.exe	svchost.exe
PID 3004 wrote to memory of 2604	3004	explorer.exe	svchost.exe
PID 3004 wrote to memory of 2604	3004	explorer.exe	svchost.exe
PID 3004 wrote to memory of 2776	3004	explorer.exe	vssadmin.exe
PID 3004 wrote to memory of 2776	3004	explorer.exe	vssadmin.exe
PID 3004 wrote to memory of 2776	3004	explorer.exe	vssadmin.exe
PID 3004 wrote to memory of 2776	3004	explorer.exe	vssadmin.exe

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
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:836
- C:\Users\Admin\AppData\Local\Temp\cryptowall.exe
  "C:\Users\Admin\AppData\Local\Temp\cryptowall.exe"
  2⤵
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:1688
- - C:\Windows\syswow64\explorer.exe
    "C:\Windows\syswow64\explorer.exe"
    3⤵
    - Drops startup file
    - Adds Run key to start application
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of WriteProcessMemory
    PID:3004
  - - C:\Windows\syswow64\svchost.exe
      -k netsvcs
      4⤵
      PID:2604
  - - C:\Windows\syswow64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      4⤵
      Interacts with shadow copies
      PID:2776

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2564

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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

Indicator Removal

T1070

File Deletion

T1070.004

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Inhibit System Recovery

T1490

Replay Monitor

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Downloads

memory/836-0-0x00000000003D0000-0x00000000003E6000-memory.dmp

Filesize
88KB

Download
memory/1688-11-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1688-14-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/1688-5-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/1688-7-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/1688-9-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/1688-1-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/1688-13-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/1688-3-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/1688-16-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/2604-22-0x0000000000080000-0x00000000000A5000-memory.dmp

Filesize
148KB

Download
memory/2604-23-0x0000000000080000-0x00000000000A5000-memory.dmp

Filesize
148KB

Download
memory/2604-25-0x0000000000080000-0x00000000000A5000-memory.dmp

Filesize
148KB

Download
memory/3004-15-0x0000000000110000-0x0000000000135000-memory.dmp

Filesize
148KB

Download
memory/3004-18-0x0000000000110000-0x0000000000135000-memory.dmp

Filesize
148KB

Download