526b432752bac2edc49ee4a3cc2428f5d7249fa3afe66deba5d23e12e4bce68c

Analysis

max time kernel
149s
max time network
154s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
19-11-2024 23:52

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General

Target

Rack/311d088d7c22fea0c84e1f53d3ba5dd8fb9429a2cf7476e061d061c40c20d8c2.exe
Size

764KB
MD5

53b1743df6b607ba17cdad0157fc3e1a
SHA1

f0205a784c6a76785b3ccc4ee71196daf5adfd54
SHA256

311d088d7c22fea0c84e1f53d3ba5dd8fb9429a2cf7476e061d061c40c20d8c2
SHA512

79917f11c1a5547a0ab4cbe8c48ab92b51e160b79b00e379dc06daab17ee3ff55507a4b20acc702e7bc557f76363bc3982e1bd1b464bf5cdc581db5618e5a27f
SSDEEP

12288:wek+VwEZ2Lm1hSQHLDbCPA8Y9JczoB9CI:wdRESuhhwoDP

Score

9^/10

defense_evasion discovery execution impact persistence ransomware

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\utuwatav = "\"C:\\Windows\\yhutewds.exe\""	explorer.exe

Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

21 ipecho.net

flow	ioc
21	ipecho.net

Suspicious use of SetThreadContext 1 IoCs

Processes:

311d088d7c22fea0c84e1f53d3ba5dd8fb9429a2cf7476e061d061c40c20d8c2.exe

description	pid	process	target process
PID 1144 set thread context of 4528	1144	311d088d7c22fea0c84e1f53d3ba5dd8fb9429a2cf7476e061d061c40c20d8c2.exe	explorer.exe

Drops file in Windows directory 2 IoCs

Processes:

explorer.exe

description ioc process

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

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

System Location Discovery: System Language Discovery 1 TTPs 2 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:

311d088d7c22fea0c84e1f53d3ba5dd8fb9429a2cf7476e061d061c40c20d8c2.exeexplorer.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	311d088d7c22fea0c84e1f53d3ba5dd8fb9429a2cf7476e061d061c40c20d8c2.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	explorer.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

1328 vssadmin.exe

pid	process
1328	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-1-5-21-4089630652-1596403869-279772308-1000\Software\Microsoft\Internet Explorer\PhishingFilter	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\SOFTWARE\Microsoft\Internet Explorer\PhishingFilter\EnabledV8 = "0"	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\SOFTWARE\Microsoft\Internet Explorer\PhishingFilter\EnabledV9 = "0"	explorer.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

vssvc.exe

description pid process

Token: SeBackupPrivilege 2436 vssvc.exe
Token: SeRestorePrivilege 2436 vssvc.exe
Token: SeAuditPrivilege 2436 vssvc.exe

description	pid	process
Token: SeBackupPrivilege	2436	vssvc.exe
Token: SeRestorePrivilege	2436	vssvc.exe
Token: SeAuditPrivilege	2436	vssvc.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

311d088d7c22fea0c84e1f53d3ba5dd8fb9429a2cf7476e061d061c40c20d8c2.exeexplorer.exe

description	pid	process	target process
PID 1144 wrote to memory of 4528	1144	311d088d7c22fea0c84e1f53d3ba5dd8fb9429a2cf7476e061d061c40c20d8c2.exe	explorer.exe
PID 1144 wrote to memory of 4528	1144	311d088d7c22fea0c84e1f53d3ba5dd8fb9429a2cf7476e061d061c40c20d8c2.exe	explorer.exe
PID 1144 wrote to memory of 4528	1144	311d088d7c22fea0c84e1f53d3ba5dd8fb9429a2cf7476e061d061c40c20d8c2.exe	explorer.exe
PID 1144 wrote to memory of 4528	1144	311d088d7c22fea0c84e1f53d3ba5dd8fb9429a2cf7476e061d061c40c20d8c2.exe	explorer.exe
PID 4528 wrote to memory of 1328	4528	explorer.exe	vssadmin.exe
PID 4528 wrote to memory of 1328	4528	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\311d088d7c22fea0c84e1f53d3ba5dd8fb9429a2cf7476e061d061c40c20d8c2.exe
"C:\Users\Admin\AppData\Local\Temp\Rack\311d088d7c22fea0c84e1f53d3ba5dd8fb9429a2cf7476e061d061c40c20d8c2.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1144
- 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:4528
- - C:\Windows\SYSTEM32\vssadmin.exe
    vssadmin.exe Delete Shadows /All /Quiet
    3⤵
    - Interacts with shadow copies
    PID:1328

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2436

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 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\orexenysifopiral\ufybilur

Filesize
764KB

MD5
9701095581addfe4fdf1f7741195781f

SHA1
c812d85520a5cdeb11ff8d1a00eece3940156678

SHA256
f0f633eed5e35788603f1434c3861a9f6ccc3e381d467e68db4acf03637d0566

SHA512
727b703e5291c365f45be7ed2aea8585182fd104b4d802fb19a83b96e95cc91104ae3a75785b217cd30a8a04bfaaffb2f45d1424156c71a780342087075c5601

Download Submit
memory/1144-0-0x0000000000690000-0x00000000006E1000-memory.dmp

Filesize
324KB

Download
memory/1144-1-0x0000000000400000-0x00000000004C4000-memory.dmp

Filesize
784KB

Download
memory/1144-9-0x0000000000690000-0x00000000006E1000-memory.dmp

Filesize
324KB

Download
memory/1144-8-0x0000000000400000-0x00000000004C4000-memory.dmp

Filesize
784KB

Download
memory/4528-4-0x00000000006E0000-0x0000000000751000-memory.dmp

Filesize
452KB

Download
memory/4528-6-0x00000000006E0000-0x0000000000751000-memory.dmp

Filesize
452KB

Download
memory/4528-7-0x00000000006E0000-0x0000000000751000-memory.dmp

Filesize
452KB

Download
memory/4528-10-0x00000000006E0000-0x0000000000751000-memory.dmp

Filesize
452KB

Download
memory/4528-15-0x00000000006E0000-0x0000000000751000-memory.dmp

Filesize
452KB

Download
memory/4528-20-0x00000000006E0000-0x0000000000751000-memory.dmp

Filesize
452KB

Download
memory/4528-26-0x00000000006E0000-0x0000000000751000-memory.dmp

Filesize
452KB

Download