17b4d01d32c64a62e36496829da323fe308437048ca87143de7365fabd4194fd

Analysis

max time kernel
149s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
22-11-2024 03:36

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General

Target

F45F47EDCED7FAC5A99C45AB4B8C2D54.exe
Size

86KB
MD5

f45f47edced7fac5a99c45ab4b8c2d54
SHA1

9060189dd95635c5f75d7f91c9bd345200e83028
SHA256

0529cdbc893fee664d3ac540b1e41e184797e0770808254058fc21de0a10b6c8
SHA512

ecf1ae299d0525f86b8c398d06b429164a10d6552caf08710567680ba670bc0c918bfff1807214b33a177202cbe8eeeeffa1396b91e697aed4da91fe81f523d3
SSDEEP

768:4H5GP9db20gWEF5mx1pOtIWoZzP5N1jydBWGwRYuKlYsVSsVSSVSENVSjYR:Uo760g95mRhZFrWBWvrs1/LNIYR

Score

10^/10

discovery evasion persistence upx

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe,C:\\Users\\Admin\\AppData\\Local\\Temp\\tainknoa.exe"	ctfmon.exe

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 2 IoCs

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	F45F47EDCED7FAC5A99C45AB4B8C2D54.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	knmfilchry.$00.exe

Disables RegEdit via registry modification 1 IoCs

evasion

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	ctfmon.exe

Disables Task Manager via registry modification
evasion

Deletes itself 1 IoCs

pid	Process
3760	ctfmon.exe

Executes dropped EXE 1 IoCs

pid	Process
3260	knmfilchry.$00.exe

UPX packed file 4 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral14/memory/3552-2-0x0000000000400000-0x0000000000416000-memory.dmp	upx
behavioral14/memory/3552-0-0x0000000000400000-0x0000000000416000-memory.dmp	upx
behavioral14/memory/3552-4-0x0000000000400000-0x0000000000416000-memory.dmp	upx
behavioral14/memory/3260-15-0x0000000000400000-0x0000000000416000-memory.dmp	upx

System Location Discovery: System Language Discovery 1 TTPs 4 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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ctfmon.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	knmfilchry.$00.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ctfmon.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	F45F47EDCED7FAC5A99C45AB4B8C2D54.exe

Checks SCSI registry key(s) 3 TTPs 5 IoCs

SCSI information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_WDC&Prod_WDS100T2B0A\4&215468a5&0&000000\Device Parameters	vssvc.exe
Key queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_WDC&Prod_WDS100T2B0A\4&215468a5&0&000000\Device Parameters	vssvc.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_WDC&Prod_WDS100T2B0A\4&215468a5&0&000000\Device Parameters\Partmgr	vssvc.exe
Set value (data)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_WDC&Prod_WDS100T2B0A\4&215468a5&0&000000\Device Parameters\Partmgr\PartitionTableCache = 00000000040000001a73a27760024bf60000000000000000000000000000000000000000000000000000000000000000000000000000000000001000000000000000c01200000000ffffffff0000000027010100000800001a73a2770000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000d01200000000000020ed3a000000ffffffff0000000007000100006809001a73a277000000000000d012000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000f0ff3a0000000000000005000000ffffffff000000000700010000f87f1d1a73a277000000000000f0ff3a00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000ffffffff0000000000000000000000001a73a27700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	vssvc.exe
Set value (data)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_WDC&Prod_WDS100T2B0A\4&215468a5&0&000000\Device Parameters\Partmgr\SnapshotDataCache = 534e41505041525401000000700000008ec7416a0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	vssvc.exe

Suspicious use of AdjustPrivilegeToken 11 IoCs

description	pid	Process
Token: SeBackupPrivilege	3180	vssvc.exe
Token: SeRestorePrivilege	3180	vssvc.exe
Token: SeAuditPrivilege	3180	vssvc.exe
Token: SeBackupPrivilege	4624	srtasks.exe
Token: SeRestorePrivilege	4624	srtasks.exe
Token: SeSecurityPrivilege	4624	srtasks.exe
Token: SeTakeOwnershipPrivilege	4624	srtasks.exe
Token: SeBackupPrivilege	4624	srtasks.exe
Token: SeRestorePrivilege	4624	srtasks.exe
Token: SeSecurityPrivilege	4624	srtasks.exe
Token: SeTakeOwnershipPrivilege	4624	srtasks.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 3552 wrote to memory of 3760	3552	F45F47EDCED7FAC5A99C45AB4B8C2D54.exe	83
PID 3552 wrote to memory of 3760	3552	F45F47EDCED7FAC5A99C45AB4B8C2D54.exe	83
PID 3552 wrote to memory of 3760	3552	F45F47EDCED7FAC5A99C45AB4B8C2D54.exe	83
PID 3552 wrote to memory of 3760	3552	F45F47EDCED7FAC5A99C45AB4B8C2D54.exe	83
PID 3760 wrote to memory of 3260	3760	ctfmon.exe	90
PID 3760 wrote to memory of 3260	3760	ctfmon.exe	90
PID 3760 wrote to memory of 3260	3760	ctfmon.exe	90
PID 3260 wrote to memory of 2228	3260	knmfilchry.$00.exe	91
PID 3260 wrote to memory of 2228	3260	knmfilchry.$00.exe	91
PID 3260 wrote to memory of 2228	3260	knmfilchry.$00.exe	91
PID 3260 wrote to memory of 2228	3260	knmfilchry.$00.exe	91

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\F45F47EDCED7FAC5A99C45AB4B8C2D54.exe
"C:\Users\Admin\AppData\Local\Temp\F45F47EDCED7FAC5A99C45AB4B8C2D54.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3552
- C:\Windows\SysWOW64\ctfmon.exe
  ctfmon.exe
  2⤵
  - Deletes itself
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3760
- - C:\Users\Admin\AppData\Local\Temp\knmfilchry.$00.exe
    C:\Users\Admin\AppData\Local\Temp\knmfilchry.$00.exe
    3⤵
    - Identifies VirtualBox via ACPI registry values (likely anti-VM)
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3260
  - - C:\Windows\SysWOW64\ctfmon.exe
      ctfmon.exe
      4⤵
      Modifies WinLogon for persistence
      Disables RegEdit via registry modification
      System Location Discovery: System Language Discovery
      PID:2228

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Checks SCSI registry key(s)
- Suspicious use of AdjustPrivilegeToken
PID:3180

C:\Windows\system32\srtasks.exe
C:\Windows\system32\srtasks.exe ExecuteScopeRestorePoint /WaitForRestorePoint:2
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4624

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Defense Evasion

Modify Registry

T1112

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\knmfilchry.$00.exe

Filesize
86KB

MD5
f45f47edced7fac5a99c45ab4b8c2d54

SHA1
9060189dd95635c5f75d7f91c9bd345200e83028

SHA256
0529cdbc893fee664d3ac540b1e41e184797e0770808254058fc21de0a10b6c8

SHA512
ecf1ae299d0525f86b8c398d06b429164a10d6552caf08710567680ba670bc0c918bfff1807214b33a177202cbe8eeeeffa1396b91e697aed4da91fe81f523d3

Download Submit
memory/2228-23-0x000000007FC50000-0x000000007FC5F000-memory.dmp

Filesize
60KB

Download
memory/2228-20-0x000000007FC50000-0x000000007FC5F000-memory.dmp

Filesize
60KB

Download
memory/2228-19-0x000000007FC50000-0x000000007FC5F000-memory.dmp

Filesize
60KB

Download
memory/2228-16-0x000000007FC50000-0x000000007FC5F000-memory.dmp

Filesize
60KB

Download
memory/3260-15-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/3260-14-0x0000000002060000-0x0000000002076000-memory.dmp

Filesize
88KB

Download
memory/3552-2-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/3552-4-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/3552-0-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/3552-1-0x0000000002180000-0x0000000002196000-memory.dmp

Filesize
88KB

Download
memory/3760-6-0x000000007F650000-0x000000007F65F000-memory.dmp

Filesize
60KB

Download
memory/3760-11-0x000000007F650000-0x000000007F65F000-memory.dmp

Filesize
60KB

Download
memory/3760-3-0x000000007F650000-0x000000007F65F000-memory.dmp

Filesize
60KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads