Overview

overview

8

Static

static

3

steamapps/...lp.dll

windows10-2004-x64

1

steamapps/...ic.dll

windows10-2004-x64

1

steamapps/...ic.dll

windows11-ltsc_2024-x64

6

steamapps/...64.dll

windows10-2004-x64

1

steamapps/...64.dll

windows11-ltsc_2024-x64

6

steamapps/...64.dll

windows10-2004-x64

1

steamapps/...64.dll

windows11-ltsc_2024-x64

8

steamapps/...64.dll

windows10-2004-x64

1

steamapps/...64.dll

windows11-ltsc_2024-x64

1

steamapps/...64.dll

windows10-2004-x64

1

steamapps/...64.dll

windows11-ltsc_2024-x64

1

steamapps/...st.dll

windows10-2004-x64

1

steamapps/...st.dll

windows11-ltsc_2024-x64

1

steamapps/...ng.dll

windows10-2004-x64

3

steamapps/...ng.dll

windows11-ltsc_2024-x64

3

steamapps/...64.exe

windows10-2004-x64

4

steamapps/...64.exe

windows11-ltsc_2024-x64

6

steamapps/...me.dll

windows10-2004-x64

1

steamapps/...me.dll

windows11-ltsc_2024-x64

1

steamapps/...ta.exe

windows10-2004-x64

7

steamapps/...ta.exe

windows11-ltsc_2024-x64

8

steamapps/...ta.exe

windows10-2004-x64

5

steamapps/...ta.exe

windows11-ltsc_2024-x64

8

steamapps/...re.dll

windows10-2004-x64

1

steamapps/...re.dll

windows11-ltsc_2024-x64

6

steamapps/...rs.dll

windows10-2004-x64

1

steamapps/...rs.dll

windows11-ltsc_2024-x64

6

steamapps/...ML.dll

windows10-2004-x64

1

steamapps/...ML.dll

windows11-ltsc_2024-x64

6

steamapps/...ng.exe

windows10-2004-x64

7

steamapps/...ng.exe

windows11-ltsc_2024-x64

3

steamapps/...64.dll

windows10-2004-x64

1

Sharing

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General

  • Target
    Osta.rar
  • Size 496.9MB
  • Sample261027-pvccpstyaw
  • SHA256 1638a31528d55fb3b39b970414bbeeea00a67153ef84299243f555f9fece7c49
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
8/10
adwaredefense_evasiondiscoveryexecutionpersistenceprivilege_escalationransomwarespyware

Malware Config

Targets

    • Target
      steamapps/common/Osta/Engine/Binaries/ThirdParty/DbgHelp/dbghelp.dll
    • Size 2.1MB
    • SHA256 4b803d0bfa5d360cfcb3237d260226743d2255eacf6a98615334fb55deb7cf88
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    1/10
    behavioral1
    • Target
      steamapps/common/Osta/Engine/Binaries/ThirdParty/MsQuic/v220/win64/msquic.dll
    • Size 2.4MB
    • SHA256 150963f4a05ffddc9a8498ae0ec4ddf5bed762a83b6ad089d2fd8d499101c7ea
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    6/10
    adwarepersistenceransomwarespyware

    • Boot or Logon Autostart Execution: Active Setup

      Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

      persistence

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    behavioral2behavioral3
    • Target
      steamapps/common/Osta/Engine/Binaries/ThirdParty/NVIDIA/NVaftermath/Win64/GFSDK_Aftermath_Lib.x64.dll
    • Size 5.2MB
    • SHA256 072d085f523bc244cf4df401dee5c5d2e0c19b7e0cb5f62e55b3da5f674a8cfa
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    6/10
    adwarepersistenceransomwarespyware

    • Boot or Logon Autostart Execution: Active Setup

      Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

      persistence

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    behavioral4behavioral5
    • Target
      steamapps/common/Osta/Engine/Binaries/ThirdParty/Ogg/Win64/VS2015/libogg_64.dll
    • Size 48KB
    • SHA256 284a6e70a6dce01f8a02d93e1bb78baf0efb6140459c587d8986d59fb6bd675b
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    8/10
    adwarepersistenceransomwarespyware

    • Boot or Logon Autostart Execution: Active Setup

      Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

      persistence

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    behavioral6behavioral7
    • Target
      steamapps/common/Osta/Engine/Binaries/ThirdParty/Vorbis/Win64/VS2015/libvorbis_64.dll
    • Size 1.6MB
    • SHA256 0f66dcb5837e9b59c499277fd272b862043356aa9145802cf0a63e00a1bcca59
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    1/10
    behavioral8behavioral9
    • Target
      steamapps/common/Osta/Engine/Binaries/ThirdParty/Vorbis/Win64/VS2015/libvorbisfile_64.dll
    • Size 37KB
    • SHA256 a9d6f5538f44011c1f65d7ace64216a237636717cb0c8c59f4f89cc08dd3d24f
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    1/10
    behavioral10behavioral11
    • Target
      steamapps/common/Osta/Engine/Binaries/ThirdParty/Windows/XAudio2_9/x64/xaudio2_9redist.dll
    • Size 827KB
    • SHA256 0e01f400baa09694cacfd2cfbff0d721c17b56785d2d6e29b6fdd117f70ccc1e
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    1/10
    behavioral12behavioral13
    • Target
      steamapps/common/Osta/Engine/Binaries/Win64/EOSSDK-Win64-Shipping.dll
    • Size 17.4MB
    • SHA256 b0591a96e7daa4a1031fff1fc1ff4332285e1d38d9676c33ab32d9da2ff8f765
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    3/10
    discovery
    behavioral14behavioral15
    • Target
      steamapps/common/Osta/Engine/Extras/Redist/en-us/UEPrereqSetup_x64.exe
    • Size 48.2MB
    • SHA256 a34cf70cc9c5520db58dd4c0344d4c5a645ffdd3055f123a8affac456cef6453
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    6/10
    discoveryadwarepersistenceransomwarespyware

    • Boot or Logon Autostart Execution: Active Setup

      Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

      persistence

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    behavioral16behavioral17
    • Target
      steamapps/common/Osta/Engine/Plugins/NNE/NNERuntimeORT/Binaries/ThirdParty/Onnxruntime/Win64/onnxruntime.dll
    • Size 12.9MB
    • SHA256 7d9c6f9e0675e04458b0146962d8d6dfb0be9a160963609ffb39dcfdae2a3802
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    1/10
    behavioral18behavioral19
    • Target
      steamapps/common/Osta/Osta.exe
    • Size 392KB
    • SHA256 77c6862ac81399f3acc4d15388c3ccf760631d074815fabce5728a17baf00085
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    8/10
    discoveryexecutionpersistenceprivilege_escalationransomware

    • Downloads MZ/PE file

    • Checks computer location settings

      Looks up country code configured in the registry, likely geofence.

    • Executes dropped EXE

    • Loads dropped DLL

    • Adds Run key to start application

      persistence

    • Checks installed software on the system

      Looks up Uninstall key entries in the registry to enumerate software on the system.

      discovery

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    • Drops file in System32 directory

    behavioral20behavioral21
    • Target
      steamapps/common/Osta/Osta.exe.legit
    • Size 391KB
    • SHA256 060475805196e6bf8fa7d9c14aa42d4cebfb98c5dfeaf84b23db5cdb2a76022f
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    8/10
    defense_evasionadwarepersistenceransomwarespyware

    • Boot or Logon Autostart Execution: Active Setup

      Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

      persistence

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    • Suspicious use of NtSetInformationThreadHideFromDebugger

      defense_evasion
    behavioral22behavioral23
    • Target
      steamapps/common/Osta/Osta/Binaries/Win64/D3D12/D3D12Core.dll
    • Size 3.2MB
    • SHA256 5528998b9b894f518c734fe22eff9f173ddba5f3110709050f0026b205eda3d0
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    6/10
    adwarepersistenceransomwarespyware

    • Boot or Logon Autostart Execution: Active Setup

      Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

      persistence

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    behavioral24behavioral25
    • Target
      steamapps/common/Osta/Osta/Binaries/Win64/D3D12/d3d12SDKLayers.dll
    • Size 5.5MB
    • SHA256 665d77a8f664f40ac09a8bd9f9f472d092d397834fbfc6703f15ffd058a2244a
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    6/10
    adwarepersistenceransomwarespyware

    • Boot or Logon Autostart Execution: Active Setup

      Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

      persistence

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    behavioral26behavioral27
    • Target
      steamapps/common/Osta/Osta/Binaries/Win64/DML/DirectML.dll
    • Size 13.4MB
    • SHA256 5ab77cc5db8e1544d386fd28586598317da8dcbef098fb86d8d8a60e739e0e5d
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    6/10
    adwarepersistenceransomwarespyware

    • Boot or Logon Autostart Execution: Active Setup

      Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

      persistence

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    behavioral28behavioral29
    • Target
      steamapps/common/Osta/Osta/Binaries/Win64/Osta-Win64-Shipping.exe
    • Size 139.3MB
    • SHA256 085c141943843e4fca32e7780429d2c8e25223c99570574126745739cd89b7ef
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    7/10
    discovery

    • Checks computer location settings

      Looks up country code configured in the registry, likely geofence.

    behavioral30behavioral31
    • Target
      steamapps/common/Osta/Osta/Binaries/Win64/boost_atomic-mt-x64.dll
    • Size 17KB
    • SHA256 d2afe12d3ac81f642266747a3688c157fbab614b442d12a54a15d08628c683b6
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    1/10
    behavioral32

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1
T1059

Windows Command Shell

1
T1059.003

Persistence

Boot or Logon Autostart Execution

2
T1547

Active Setup

1
T1547.014

Registry Run Keys / Startup Folder

1
T1547.001

Event Triggered Execution

1
T1546

Installer Packages

1
T1546.016

Privilege Escalation

Boot or Logon Autostart Execution

2
T1547

Active Setup

1
T1547.014

Registry Run Keys / Startup Folder

1
T1547.001

Event Triggered Execution

1
T1546

Installer Packages

1
T1546.016

Defense Evasion

Debugger Evasion

1
T1622

Modify Registry

3
T1112

System Binary Proxy Execution

1
T1218

Msiexec

1
T1218.007

Credential Access

Discovery

Browser Information Discovery

1
T1217

Debugger Evasion

1
T1622

Peripheral Device Discovery

2
T1120

Query Registry

7
T1012

System Information Discovery

6
T1082

System Location Discovery

1
T1614

System Language Discovery

1
T1614.001

System Network Configuration Discovery

2
T1016

Internet Connection Discovery

1
T1016.001

System Time Discovery

1
T1124

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Tasks

static1

Score
3/10

behavioral1

Score
1/10

behavioral2

Score
1/10

behavioral3

adwarepersistenceransomwarespyware
Score
6/10

behavioral4

Score
1/10

behavioral5

adwarepersistenceransomwarespyware
Score
6/10

behavioral6

Score
1/10

behavioral7

adwarepersistenceransomwarespyware
Score
8/10

behavioral8

Score
1/10

behavioral9

Score
1/10

behavioral10

Score
1/10

behavioral11

Score
1/10

behavioral12

Score
1/10

behavioral13

Score
1/10

behavioral14

discovery
Score
3/10

behavioral15

discovery
Score
3/10

behavioral16

discovery
Score
4/10

behavioral17

adwarediscoverypersistenceransomwarespyware
Score
6/10

behavioral18

Score
1/10

behavioral19

Score
1/10

behavioral20

discovery
Score
7/10

behavioral21

discoveryexecutionpersistenceprivilege_escalationransomware
Score
8/10

behavioral22

defense_evasion
Score
5/10

behavioral23

adwaredefense_evasionpersistenceransomwarespyware
Score
8/10

behavioral24

Score
1/10

behavioral25

adwarepersistenceransomwarespyware
Score
6/10

behavioral26

Score
1/10

behavioral27

adwarepersistenceransomwarespyware
Score
6/10

behavioral28

Score
1/10

behavioral29

adwarepersistenceransomwarespyware
Score
6/10

behavioral30

discovery
Score
7/10

behavioral31

discovery
Score
3/10

behavioral32

Score
1/10