Overview

overview

10

Static

static

fss.exe

windows7_x64

10

fss.exe

windows10_x64

10

Analysis

  • max time kernel
    151s
  • max time network
    6s
  • platform
    windows7_x64
  • resource
    win7v200430
  • submitted
    26-06-2020 03:21

Sharing

Copy URL
Twitter E-mail
Report Analysis Logs

General

  • Target

    fss.exe

  • Size

    92KB

  • MD5

    23225afa88a61b262ee6bfe8a0b0b9bb

  • SHA1

    a360d8a90f35299dd37232ed9a1b7ac284e06e32

  • SHA256

    a49742e72ca26d37e26962ba7f2d929b87ddb6ce07f3304f78e9af499b226281

  • SHA512

    470898ca49f36928625d34878b9362193fa4a1051ef4a0e001dc325f71700d22366d66f781290930a9dcbc75d33b939e676342e7be5d95ee5c5bbefe9c92bf6d

Score
10/10
dharmapersistenceransomwarespyware

Malware Config

Extracted

Path

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Info.hta

Ransom Note
YOUR FILES ARE ENCRYPTED Don't worry,you can return all your files! If you want to restore them, follow this link: email [email protected] YOUR ID If you have not been answered via the link within 12 hours, write to us by e-mail: [email protected] Attention! Do not rename encrypted files. Do not try to decrypt your data using third party software, it may cause permanent data loss. Decryption of your files with the help of third parties may cause increased price (they add their fee to our) or you can become a victim of a scam.

Signatures

  • Dharma

    Dharma is a ransomware that uses security software installation to hide malicious activities.

    ransomwaredharma
  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

    ransomware
  • Modifies extensions of user files 2 IoCs

    Ransomware generally changes the extension on encrypted files.

    ransomware
  • Drops startup file 5 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

    spyware
  • Adds Run key to start application 2 TTPs 3 IoCs
    persistence
  • Drops desktop.ini file(s) 64 IoCs
  • Drops file in System32 directory 2 IoCs
  • Drops file in Program Files directory 64 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Interacts with shadow copies 2 TTPs 2 IoCs

    Shadow copies are often targeted by ransomware to inhibit system recovery.

    ransomware
  • Modifies Internet Explorer settings 1 TTPs 2 IoCs
    adwarespyware
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of FindShellTrayWindow 2 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\fss.exe
    "C:\Users\Admin\AppData\Local\Temp\fss.exe"
    1⤵
    • Modifies extensions of user files
    • Drops startup file
    • Adds Run key to start application
    • Drops desktop.ini file(s)
    • Drops file in System32 directory
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:272
    • C:\Windows\system32\cmd.exe
      "C:\Windows\system32\cmd.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:824
      • C:\Windows\system32\mode.com
        mode con cp select=1251
        3⤵
          PID:1380
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          3⤵
          • Interacts with shadow copies
          PID:1832
      • C:\Windows\system32\cmd.exe
        "C:\Windows\system32\cmd.exe"
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:1604
        • C:\Windows\system32\mode.com
          mode con cp select=1251
          3⤵
            PID:1584
          • C:\Windows\system32\vssadmin.exe
            vssadmin delete shadows /all /quiet
            3⤵
            • Interacts with shadow copies
            PID:1988
        • C:\Windows\System32\mshta.exe
          "C:\Windows\System32\mshta.exe" "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Info.hta"
          2⤵
          • Modifies Internet Explorer settings
          PID:2016
        • C:\Windows\System32\mshta.exe
          "C:\Windows\System32\mshta.exe" "C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup\Info.hta"
          2⤵
          • Modifies Internet Explorer settings
          • Suspicious use of FindShellTrayWindow
          PID:1976
      • C:\Windows\system32\vssvc.exe
        C:\Windows\system32\vssvc.exe
        1⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:1900
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Desktop\FILES ENCRYPTED.txt
        1⤵
        • Suspicious use of FindShellTrayWindow
        PID:1992

      Network

      MITRE ATT&CK Matrix ATT&CK v6

      Initial Access

      Execution

      Persistence

      Registry Run Keys / Startup Folder

      1
      T1060

      Privilege Escalation

      Defense Evasion

      File Deletion

      2
      T1107

      Modify Registry

      2
      T1112

      Credential Access

      Credentials in Files

      1
      T1081

      Discovery

      System Information Discovery

      1
      T1082

      Lateral Movement

      Collection

      Data from Local System

      1
      T1005

      Exfiltration

      Command and Control

      Impact

      Inhibit System Recovery

      2
      T1490

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup\Info.hta
        MD5

        aa7e471745d6bdaa05b9e9eec85f067c

        SHA1

        01a6602cf2ae21f074ce5c0765ae3c25e8f11e33

        SHA256

        fba31ecd7cfca77e77ecd32e5651e87965968fc5dd783b34d3348f6384321e42

        SHA512

        73048ddafd6d8d355e254bc313f6b3e0dc129c7665d6b74f1b40485e4bbcb7ee0ee8b4b99b4fdf9102d109d63a0ccac9fca78e567b93cf77d146cf133500d3c1

        Download Submit
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Info.hta
        MD5

        aa7e471745d6bdaa05b9e9eec85f067c

        SHA1

        01a6602cf2ae21f074ce5c0765ae3c25e8f11e33

        SHA256

        fba31ecd7cfca77e77ecd32e5651e87965968fc5dd783b34d3348f6384321e42

        SHA512

        73048ddafd6d8d355e254bc313f6b3e0dc129c7665d6b74f1b40485e4bbcb7ee0ee8b4b99b4fdf9102d109d63a0ccac9fca78e567b93cf77d146cf133500d3c1

        Download Submit
      • C:\Users\Admin\Desktop\FILES ENCRYPTED.txt
        MD5

        532e55eaef86283b9da3520522373667

        SHA1

        ed2931d1b2cb67120942dbb0e99879ed4bb4d18a

        SHA256

        421ff49103a11496c0ee49a3ca13446d5343a4facabf3f5cf0eeebe48b737c81

        SHA512

        db4d2f353263a98fa75d831f09b10774cf61b7b2368399109c916a412d8314596f57790412b3d01fc891347c8efe154b39e8ca482f9f791b3187c4c50711928e

        Download Submit
      • memory/824-0-0x0000000000000000-mapping.dmp
        Download
      • memory/1380-1-0x0000000000000000-mapping.dmp
        Download
      • memory/1584-4-0x0000000000000000-mapping.dmp
        Download
      • memory/1604-3-0x0000000000000000-mapping.dmp
        Download
      • memory/1832-2-0x0000000000000000-mapping.dmp
        Download
      • memory/1976-7-0x0000000000000000-mapping.dmp
        Download
      • memory/1988-5-0x0000000000000000-mapping.dmp
        Download
      • memory/2016-6-0x0000000000000000-mapping.dmp
        Download
      • memory/2016-20-0x0000000005A50000-0x0000000005A73000-memory.dmp
        Filesize

        140KB

        Download
      • memory/2016-21-0x0000000003F30000-0x0000000003F3B000-memory.dmp
        Filesize

        44KB

        Download