526b432752bac2edc49ee4a3cc2428f5d7249fa3afe66deba5d23e12e4bce68c

Analysis

max time kernel
149s
max time network
152s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
19-11-2024 23:52

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General

Target

Rack/fc330047cbdd7edc5776a5ef560e9ca73f3986ccd17f0e775a57b563dd8a2cdd.exe
Size

248KB
MD5

684b51ea1c9252e13066d7fe9d0cecd0
SHA1

f0db492b67f4b46c63db6afaa59a2d33848c4e4b
SHA256

fc330047cbdd7edc5776a5ef560e9ca73f3986ccd17f0e775a57b563dd8a2cdd
SHA512

2afbd8225998bd2f54d3cb9dbebe3e61767a90ac1be0c00c917d6011013e3fb6eb014b47f3df3ca48e0af74a8c4b801d13eb8ca70873ff2dbf7aefa38b2bc25d
SSDEEP

3072:c49kOnGapJGUghQdP984U9k4UQ8l9xTd36oujT9k6G:c49kQzJGUd9fU18l7Td3rujT9k

Score

9^/10

defense_evasion discovery evasion execution impact persistence ransomware trojan

Malware Config

Signatures

Deletes shadow copies 3 TTPs
Ransomware often targets backup files to inhibit system recovery.
ransomware defense_evasion impact execution

File Deletion
T1070.004

Inhibit System Recovery
T1490

Windows Management Instrumentation
T1047

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

explorer.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ixehyruz = "\"C:\\Windows\\isyvaxub.exe\""	explorer.exe

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

T1082

Processes:

fc330047cbdd7edc5776a5ef560e9ca73f3986ccd17f0e775a57b563dd8a2cdd.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	fc330047cbdd7edc5776a5ef560e9ca73f3986ccd17f0e775a57b563dd8a2cdd.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

fc330047cbdd7edc5776a5ef560e9ca73f3986ccd17f0e775a57b563dd8a2cdd.exe

description	pid	process	target process
PID 2404 set thread context of 1884	2404	fc330047cbdd7edc5776a5ef560e9ca73f3986ccd17f0e775a57b563dd8a2cdd.exe	explorer.exe

Drops file in Windows directory 2 IoCs

Processes:

explorer.exe

description ioc process

File opened for modification C:\Windows\isyvaxub.exe explorer.exe
File created C:\Windows\isyvaxub.exe explorer.exe

description	ioc	process
File opened for modification	C:\Windows\isyvaxub.exe	explorer.exe
File created	C:\Windows\isyvaxub.exe	explorer.exe

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

Processes:

fc330047cbdd7edc5776a5ef560e9ca73f3986ccd17f0e775a57b563dd8a2cdd.exeexplorer.exevssadmin.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	fc330047cbdd7edc5776a5ef560e9ca73f3986ccd17f0e775a57b563dd8a2cdd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	explorer.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vssadmin.exe

Interacts with shadow copies 3 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
ransomware

File Deletion
T1070.004

Inhibit System Recovery
T1490

Direct Volume Access
T1006

Processes:

vssadmin.exe

pid process

2456 vssadmin.exe

pid	process
2456	vssadmin.exe

Modifies Internet Explorer Phishing Filter 1 TTPs 3 IoCs

Modify Registry

T1112

Processes:

explorer.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-2703099537-420551529-3771253338-1000\Software\Microsoft\Internet Explorer\PhishingFilter	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2703099537-420551529-3771253338-1000\Software\Microsoft\Internet Explorer\PhishingFilter\EnabledV8 = "0"	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2703099537-420551529-3771253338-1000\Software\Microsoft\Internet Explorer\PhishingFilter\EnabledV9 = "0"	explorer.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

vssvc.exe

description pid process

Token: SeBackupPrivilege 2152 vssvc.exe
Token: SeRestorePrivilege 2152 vssvc.exe
Token: SeAuditPrivilege 2152 vssvc.exe

description	pid	process
Token: SeBackupPrivilege	2152	vssvc.exe
Token: SeRestorePrivilege	2152	vssvc.exe
Token: SeAuditPrivilege	2152	vssvc.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

fc330047cbdd7edc5776a5ef560e9ca73f3986ccd17f0e775a57b563dd8a2cdd.exeexplorer.exe

description	pid	process	target process
PID 2404 wrote to memory of 1884	2404	fc330047cbdd7edc5776a5ef560e9ca73f3986ccd17f0e775a57b563dd8a2cdd.exe	explorer.exe
PID 2404 wrote to memory of 1884	2404	fc330047cbdd7edc5776a5ef560e9ca73f3986ccd17f0e775a57b563dd8a2cdd.exe	explorer.exe
PID 2404 wrote to memory of 1884	2404	fc330047cbdd7edc5776a5ef560e9ca73f3986ccd17f0e775a57b563dd8a2cdd.exe	explorer.exe
PID 2404 wrote to memory of 1884	2404	fc330047cbdd7edc5776a5ef560e9ca73f3986ccd17f0e775a57b563dd8a2cdd.exe	explorer.exe
PID 2404 wrote to memory of 1884	2404	fc330047cbdd7edc5776a5ef560e9ca73f3986ccd17f0e775a57b563dd8a2cdd.exe	explorer.exe
PID 1884 wrote to memory of 2456	1884	explorer.exe	vssadmin.exe
PID 1884 wrote to memory of 2456	1884	explorer.exe	vssadmin.exe
PID 1884 wrote to memory of 2456	1884	explorer.exe	vssadmin.exe
PID 1884 wrote to memory of 2456	1884	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\Rack\fc330047cbdd7edc5776a5ef560e9ca73f3986ccd17f0e775a57b563dd8a2cdd.exe
"C:\Users\Admin\AppData\Local\Temp\Rack\fc330047cbdd7edc5776a5ef560e9ca73f3986ccd17f0e775a57b563dd8a2cdd.exe"
1⤵
- Checks whether UAC is enabled
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2404
- C:\Windows\SysWOW64\explorer.exe
  "C:\Windows\system32\explorer.exe"
  2⤵
  - Adds Run key to start application
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Modifies Internet Explorer Phishing Filter
  - Suspicious use of WriteProcessMemory
  PID:1884
- - C:\Windows\SysWOW64\vssadmin.exe
    vssadmin.exe Delete Shadows /All /Quiet
    3⤵
    - System Location Discovery: System Language Discovery
    - Interacts with shadow copies
    PID:2456

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2152

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Windows Management Instrumentation

T1047

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

Direct Volume Access

T1006

Indicator Removal

T1070

File Deletion

T1070.004

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Inhibit System Recovery

T1490

Replay Monitor

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Downloads

C:\ProgramData\uvoqufaguqolipaz\01000000

Filesize
248KB

MD5
e6e3936d542a5b3607385b1f7441da99

SHA1
10ac743c1e728f4d950c8a32956493c3ac77c4f0

SHA256
ea7b84c31552294857e88229075d09639b6eef26679c6173209266955d35c3af

SHA512
9349175016effa84c3b99d22e2e765fdb938641c179f225f8dadd7cb3ac83a02d2a7dca8e9d8afc7f07e3a027bff14d51e0ead03b00cc9963fa86142b6e07d40

Download Submit
memory/1884-1-0x0000000000080000-0x00000000000B8000-memory.dmp

Filesize
224KB

Download
memory/1884-3-0x0000000000080000-0x00000000000B8000-memory.dmp

Filesize
224KB

Download
memory/1884-5-0x0000000000080000-0x00000000000B8000-memory.dmp

Filesize
224KB

Download
memory/1884-10-0x0000000000080000-0x00000000000B8000-memory.dmp

Filesize
224KB

Download
memory/1884-12-0x0000000000080000-0x00000000000B8000-memory.dmp

Filesize
224KB

Download
memory/1884-13-0x0000000000080000-0x00000000000B8000-memory.dmp

Filesize
224KB

Download
memory/1884-14-0x0000000000080000-0x00000000000B8000-memory.dmp

Filesize
224KB

Download
memory/1884-15-0x0000000000080000-0x00000000000B8000-memory.dmp

Filesize
224KB

Download