bab1853454ca6fdd3acd471254101db1b805b601e309a49ec7b4b1fbcfc47ad7

Resubmissions

01-03-2024 20:38

240301-ze5pesdb79 3

01-03-2024 20:03

240301-ysybtsce5x 3

01-03-2024 18:44

240301-xdmfcabg67 3

01-03-2024 17:56

240301-wjhhxabb92 10

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
01-03-2024 17:56

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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\a223dcb.exe explorer.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\a223dcb.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-1-5-21-1650401615-1019878084-3673944445-1000\Software\Microsoft\Windows\CurrentVersion\Run\a223dc = "C:\\a223dcb\\a223dcb.exe"	explorer.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1650401615-1019878084-3673944445-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\*223dc = "C:\\a223dcb\\a223dcb.exe"	explorer.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1650401615-1019878084-3673944445-1000\Software\Microsoft\Windows\CurrentVersion\Run\a223dcb = "C:\\Users\\Admin\\AppData\\Roaming\\a223dcb.exe"	explorer.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1650401615-1019878084-3673944445-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\*223dcb = "C:\\Users\\Admin\\AppData\\Roaming\\a223dcb.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
6 myexternalip.com
Suspicious use of SetThreadContext 1 IoCs

Processes:

cryptowall.exe

description pid process target process

PID 2128 set thread context of 2952 2128 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

2500 vssadmin.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

cryptowall.exe

pid process

2128 cryptowall.exe
2128 cryptowall.exe
Suspicious behavior: MapViewOfSection 2 IoCs

Processes:

cryptowall.exeexplorer.exe

pid process

2952 cryptowall.exe
2516 explorer.exe

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

description	pid	process	target process
PID 2128 set thread context of 2952	2128	cryptowall.exe	cryptowall.exe

pid	process
2500	vssadmin.exe

pid	process
2128	cryptowall.exe
2128	cryptowall.exe

pid	process
2952	cryptowall.exe
2516	explorer.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

Processes:

cryptowall.exevssvc.exe

description	pid	process
Token: 33	2128	cryptowall.exe
Token: SeIncBasePriorityPrivilege	2128	cryptowall.exe
Token: SeBackupPrivilege	2724	vssvc.exe
Token: SeRestorePrivilege	2724	vssvc.exe
Token: SeAuditPrivilege	2724	vssvc.exe

Suspicious use of WriteProcessMemory 22 IoCs

Processes:

cryptowall.execryptowall.exeexplorer.exe

description	pid	process	target process
PID 2128 wrote to memory of 2952	2128	cryptowall.exe	cryptowall.exe
PID 2128 wrote to memory of 2952	2128	cryptowall.exe	cryptowall.exe
PID 2128 wrote to memory of 2952	2128	cryptowall.exe	cryptowall.exe
PID 2128 wrote to memory of 2952	2128	cryptowall.exe	cryptowall.exe
PID 2128 wrote to memory of 2952	2128	cryptowall.exe	cryptowall.exe
PID 2128 wrote to memory of 2952	2128	cryptowall.exe	cryptowall.exe
PID 2128 wrote to memory of 2952	2128	cryptowall.exe	cryptowall.exe
PID 2128 wrote to memory of 2952	2128	cryptowall.exe	cryptowall.exe
PID 2128 wrote to memory of 2952	2128	cryptowall.exe	cryptowall.exe
PID 2128 wrote to memory of 2952	2128	cryptowall.exe	cryptowall.exe
PID 2952 wrote to memory of 2516	2952	cryptowall.exe	explorer.exe
PID 2952 wrote to memory of 2516	2952	cryptowall.exe	explorer.exe
PID 2952 wrote to memory of 2516	2952	cryptowall.exe	explorer.exe
PID 2952 wrote to memory of 2516	2952	cryptowall.exe	explorer.exe
PID 2516 wrote to memory of 2512	2516	explorer.exe	svchost.exe
PID 2516 wrote to memory of 2512	2516	explorer.exe	svchost.exe
PID 2516 wrote to memory of 2512	2516	explorer.exe	svchost.exe
PID 2516 wrote to memory of 2512	2516	explorer.exe	svchost.exe
PID 2516 wrote to memory of 2500	2516	explorer.exe	vssadmin.exe
PID 2516 wrote to memory of 2500	2516	explorer.exe	vssadmin.exe
PID 2516 wrote to memory of 2500	2516	explorer.exe	vssadmin.exe
PID 2516 wrote to memory of 2500	2516	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:2128

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:2952

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:2516

C:\Windows\syswow64\svchost.exe
-k netsvcs
4⤵
PID:2512

C:\Windows\syswow64\vssadmin.exe
vssadmin.exe Delete Shadows /All /Quiet
4⤵
- Interacts with shadow copies
PID:2500

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2724

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/2128-1-0x00000000001C0000-0x00000000001D6000-memory.dmp

Filesize
88KB

Download
memory/2512-23-0x00000000000E0000-0x0000000000105000-memory.dmp

Filesize
148KB

Download
memory/2512-22-0x00000000000E0000-0x0000000000105000-memory.dmp

Filesize
148KB

Download
memory/2512-25-0x00000000000E0000-0x0000000000105000-memory.dmp

Filesize
148KB

Download
memory/2516-18-0x0000000000370000-0x0000000000395000-memory.dmp

Filesize
148KB

Download
memory/2516-15-0x0000000000370000-0x0000000000395000-memory.dmp

Filesize
148KB

Download
memory/2952-13-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/2952-11-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2952-9-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/2952-7-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/2952-5-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/2952-3-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/2952-14-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/2952-0-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/2952-16-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download