022728f678d8dcc6cba20147595ed4099e9c98be0582c0f67518d5664e3b8523

Resubmissions

03-03-2024 01:34

240303-by6ttsbe94 10

03-03-2024 01:31

240303-bxkj7sbe62 7

Analysis

max time kernel
131s
max time network
142s
platform
windows7_x64
resource
win7-20240220-en
resource tags

arch:x64arch:x86image:win7-20240220-enlocale:en-usos:windows7-x64system
submitted
03-03-2024 01:34

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General

Target

Ransomware/CryptoWall.exe
Size

132KB
MD5

919034c8efb9678f96b47a20fa6199f2
SHA1

747070c74d0400cffeb28fbea17b64297f14cfbd
SHA256

e036d68b8f8b7afc6c8b6252876e1e290f11a26d4ad18ac6f310662845b2c734
SHA512

745a81c50bbfd62234edb9788c83a22e0588c5d25c00881901923a02d7096c71ef5f0cd5b73f92ad974e5174de064b0c5ea8044509039aab14b2aed83735a7c4
SSDEEP

3072:naRQpzd/99wen3XgWorw8I3h8LkMvqCgQfBUnPy8L6kssU:nJdTwo30ri3h8LkMvqCgQfBUPy8L6ksP

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\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
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

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
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

2596 vssadmin.exe
Suspicious behavior: MapViewOfSection 2 IoCs

Processes:

CryptoWall.exeexplorer.exe

pid process

2932 CryptoWall.exe
2732 explorer.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

vssvc.exe

description pid process

Token: SeBackupPrivilege 2408 vssvc.exe
Token: SeRestorePrivilege 2408 vssvc.exe
Token: SeAuditPrivilege 2408 vssvc.exe

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

pid	process
2596	vssadmin.exe

pid	process
2932	CryptoWall.exe
2732	explorer.exe

description	pid	process
Token: SeBackupPrivilege	2408	vssvc.exe
Token: SeRestorePrivilege	2408	vssvc.exe
Token: SeAuditPrivilege	2408	vssvc.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

CryptoWall.exeexplorer.exe

description	pid	process	target process
PID 2932 wrote to memory of 2732	2932	CryptoWall.exe	explorer.exe
PID 2932 wrote to memory of 2732	2932	CryptoWall.exe	explorer.exe
PID 2932 wrote to memory of 2732	2932	CryptoWall.exe	explorer.exe
PID 2932 wrote to memory of 2732	2932	CryptoWall.exe	explorer.exe
PID 2732 wrote to memory of 2544	2732	explorer.exe	svchost.exe
PID 2732 wrote to memory of 2544	2732	explorer.exe	svchost.exe
PID 2732 wrote to memory of 2544	2732	explorer.exe	svchost.exe
PID 2732 wrote to memory of 2544	2732	explorer.exe	svchost.exe
PID 2732 wrote to memory of 2596	2732	explorer.exe	vssadmin.exe
PID 2732 wrote to memory of 2596	2732	explorer.exe	vssadmin.exe
PID 2732 wrote to memory of 2596	2732	explorer.exe	vssadmin.exe
PID 2732 wrote to memory of 2596	2732	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\Ransomware\CryptoWall.exe
"C:\Users\Admin\AppData\Local\Temp\Ransomware\CryptoWall.exe"
1⤵
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2932

C:\Windows\syswow64\explorer.exe
"C:\Windows\syswow64\explorer.exe"
2⤵
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2732

C:\Windows\syswow64\svchost.exe
-k netsvcs
3⤵
PID:2544

C:\Windows\syswow64\vssadmin.exe
vssadmin.exe Delete Shadows /All /Quiet
3⤵
- Interacts with shadow copies
PID:2596

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2408

Network

MITRE ATT&CK Matrix ATT&CK v13

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

Exfiltration

Command and Control

Impact

Inhibit System Recovery

T1490

Resource Development

Reconnaissance

Replay Monitor

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Downloads

memory/2544-5-0x00000000000D0000-0x00000000000F5000-memory.dmp

Filesize
148KB

Download
memory/2544-6-0x00000000000D0000-0x00000000000F5000-memory.dmp

Filesize
148KB

Download
memory/2544-8-0x00000000000D0000-0x00000000000F5000-memory.dmp

Filesize
148KB

Download
memory/2732-0-0x0000000000080000-0x00000000000A5000-memory.dmp

Filesize
148KB

Download
memory/2732-1-0x0000000000080000-0x00000000000A5000-memory.dmp

Filesize
148KB

Download