c2bf26d1b3a311be1bec839ca7c26bf2c944fd79333485a271230ec435c318dd

Analysis

max time kernel
133s
max time network
146s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
02-03-2024 20:19

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General

Target

Ransomware/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

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\6542a96f.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-1-5-21-778096762-2241304387-192235952-1000\Software\Microsoft\Windows\CurrentVersion\Run\6542a96 = "C:\\6542a96f\\6542a96f.exe"	explorer.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-778096762-2241304387-192235952-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\*542a96 = "C:\\6542a96f\\6542a96f.exe"	explorer.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-778096762-2241304387-192235952-1000\Software\Microsoft\Windows\CurrentVersion\Run\6542a96f = "C:\\Users\\Admin\\AppData\\Roaming\\6542a96f.exe"	explorer.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-778096762-2241304387-192235952-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\*542a96f = "C:\\Users\\Admin\\AppData\\Roaming\\6542a96f.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 1192 set thread context of 3028	1192	cryptowall.exe	28

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

pid	Process
1668	vssadmin.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1192	cryptowall.exe
1192	cryptowall.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
3028	cryptowall.exe
2716	explorer.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: 33	1192	cryptowall.exe
Token: SeIncBasePriorityPrivilege	1192	cryptowall.exe
Token: SeBackupPrivilege	2668	vssvc.exe
Token: SeRestorePrivilege	2668	vssvc.exe
Token: SeAuditPrivilege	2668	vssvc.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 1192 wrote to memory of 3028	1192	cryptowall.exe	28
PID 1192 wrote to memory of 3028	1192	cryptowall.exe	28
PID 1192 wrote to memory of 3028	1192	cryptowall.exe	28
PID 1192 wrote to memory of 3028	1192	cryptowall.exe	28
PID 1192 wrote to memory of 3028	1192	cryptowall.exe	28
PID 1192 wrote to memory of 3028	1192	cryptowall.exe	28
PID 1192 wrote to memory of 3028	1192	cryptowall.exe	28
PID 1192 wrote to memory of 3028	1192	cryptowall.exe	28
PID 1192 wrote to memory of 3028	1192	cryptowall.exe	28
PID 1192 wrote to memory of 3028	1192	cryptowall.exe	28
PID 3028 wrote to memory of 2716	3028	cryptowall.exe	29
PID 3028 wrote to memory of 2716	3028	cryptowall.exe	29
PID 3028 wrote to memory of 2716	3028	cryptowall.exe	29
PID 3028 wrote to memory of 2716	3028	cryptowall.exe	29
PID 2716 wrote to memory of 2876	2716	explorer.exe	30
PID 2716 wrote to memory of 2876	2716	explorer.exe	30
PID 2716 wrote to memory of 2876	2716	explorer.exe	30
PID 2716 wrote to memory of 2876	2716	explorer.exe	30
PID 2716 wrote to memory of 1668	2716	explorer.exe	31
PID 2716 wrote to memory of 1668	2716	explorer.exe	31
PID 2716 wrote to memory of 1668	2716	explorer.exe	31
PID 2716 wrote to memory of 1668	2716	explorer.exe	31

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\Ransomware\cryptowall.exe
"C:\Users\Admin\AppData\Local\Temp\Ransomware\cryptowall.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1192
- C:\Users\Admin\AppData\Local\Temp\Ransomware\cryptowall.exe
  "C:\Users\Admin\AppData\Local\Temp\Ransomware\cryptowall.exe"
  2⤵
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:3028
- - 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:2716
  - - C:\Windows\syswow64\svchost.exe
      -k netsvcs
      4⤵
      PID:2876
  - - C:\Windows\syswow64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      4⤵
      Interacts with shadow copies
      PID:1668

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2668

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/1192-0-0x0000000000230000-0x0000000000246000-memory.dmp

Filesize
88KB

Download
memory/2716-15-0x00000000000C0000-0x00000000000E5000-memory.dmp

Filesize
148KB

Download
memory/2716-18-0x00000000000C0000-0x00000000000E5000-memory.dmp

Filesize
148KB

Download
memory/2876-24-0x00000000000C0000-0x00000000000E5000-memory.dmp

Filesize
148KB

Download
memory/3028-5-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/3028-9-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/3028-11-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/3028-13-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/3028-14-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/3028-7-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/3028-16-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/3028-1-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/3028-3-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download