022728f678d8dcc6cba20147595ed4099e9c98be0582c0f67518d5664e3b8523

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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

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

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.

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

pid	Process
2596	vssadmin.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
2932	CryptoWall.exe
2732	explorer.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

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

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2932 wrote to memory of 2732	2932	CryptoWall.exe	28
PID 2932 wrote to memory of 2732	2932	CryptoWall.exe	28
PID 2932 wrote to memory of 2732	2932	CryptoWall.exe	28
PID 2932 wrote to memory of 2732	2932	CryptoWall.exe	28
PID 2732 wrote to memory of 2544	2732	explorer.exe	29
PID 2732 wrote to memory of 2544	2732	explorer.exe	29
PID 2732 wrote to memory of 2544	2732	explorer.exe	29
PID 2732 wrote to memory of 2544	2732	explorer.exe	29
PID 2732 wrote to memory of 2596	2732	explorer.exe	30
PID 2732 wrote to memory of 2596	2732	explorer.exe	30
PID 2732 wrote to memory of 2596	2732	explorer.exe	30
PID 2732 wrote to memory of 2596	2732	explorer.exe	30

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 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

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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

Resubmissions

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads