Analysis

  • max time kernel
    151s
  • max time network
    132s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    11-12-2020 17:11

General

  • Target

    TrustedInstaller.exe

  • Size

    449KB

  • MD5

    574f031251f67bcc6ea9168364d2fbfd

  • SHA1

    f5d6140140829eaa550d2ef57b3ca8281b3d79bb

  • SHA256

    438d83a22ed38bb2241a99b96d644826522b28327f63055840ee7632d8e95cd8

  • SHA512

    d7234b117aabb6a50e8619d4bc3a6d283c53d7a7ee396a67f73985d6e09156ab2fc89ec52bddbd949d9236ecde081cc0123719a474b12966a5beaf910de8a15b

Malware Config

Extracted

Path

C:\!!! ALL YOUR FILES ARE ENCRYPTED !!!.TXT

Family

buran

Ransom Note
!!! ALL YOUR FILES ARE ENCRYPTED !!! All your files, documents, photos, databases and other important files are encrypted. You are not able to decrypt it by yourself! The only method of recovering files is to purchase an unique private key. Only we can give you this key and only we can recover your files. To be sure we have the decryptor and it works you can send an email: yongloun@tutanota.com and decrypt one file for free. But this file should be of not valuable! Do you really want to restore your files? Write to email: wiruxa@airmail.cc Reserved email: anygrishevich@yandex.ru Your personal ID: A3D-0BC-6D1 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.
Emails

wiruxa@airmail.cc

anygrishevich@yandex.ru

Signatures

  • Buran

    Ransomware-as-a-service based on the VegaLocker family first identified in 2019.

  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Executes dropped EXE 2 IoCs
  • Deletes itself 1 IoCs
  • Loads dropped DLL 1 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Enumerates connected drives 3 TTPs 24 IoCs

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

  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Drops file in Program Files directory 13575 IoCs
  • Interacts with shadow copies 2 TTPs 2 IoCs

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

  • Modifies system certificate store 2 TTPs 5 IoCs
  • Suspicious behavior: EnumeratesProcesses 1182 IoCs
  • Suspicious use of AdjustPrivilegeToken 85 IoCs
  • Suspicious use of WriteProcessMemory 55 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\TrustedInstaller.exe
    "C:\Users\Admin\AppData\Local\Temp\TrustedInstaller.exe"
    1⤵
    • Loads dropped DLL
    • Adds Run key to start application
    • Modifies system certificate store
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1828
    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\smss.exe
      "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\smss.exe" -start
      2⤵
      • Executes dropped EXE
      • Enumerates connected drives
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:1888
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\system32\cmd.exe" /C wmic shadowcopy delete
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1028
        • C:\Windows\SysWOW64\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:816
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\system32\cmd.exe" /C bcdedit /set {default} recoveryenabled no
        3⤵
          PID:1560
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\system32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures
          3⤵
            PID:812
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\system32\cmd.exe" /C wbadmin delete catalog -quiet
            3⤵
              PID:628
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\system32\cmd.exe" /C vssadmin delete shadows /all /quiet
              3⤵
              • Suspicious use of WriteProcessMemory
              PID:1192
              • C:\Windows\SysWOW64\vssadmin.exe
                vssadmin delete shadows /all /quiet
                4⤵
                • Interacts with shadow copies
                PID:1676
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\system32\cmd.exe" /C C:\Users\Admin\AppData\Local\Temp\~temp001.bat
              3⤵
              • Suspicious use of WriteProcessMemory
              PID:1648
              • C:\Windows\SysWOW64\Wbem\WMIC.exe
                wmic shadowcopy delete
                4⤵
                • Suspicious use of AdjustPrivilegeToken
                PID:1776
              • C:\Windows\SysWOW64\vssadmin.exe
                vssadmin delete shadows /all /quiet
                4⤵
                • Interacts with shadow copies
                PID:1392
            • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\smss.exe
              "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\smss.exe" -agent 0
              3⤵
              • Executes dropped EXE
              • Drops file in Program Files directory
              PID:1756
          • C:\Windows\SysWOW64\notepad.exe
            notepad.exe
            2⤵
            • Deletes itself
            PID:1836
        • C:\Windows\system32\vssvc.exe
          C:\Windows\system32\vssvc.exe
          1⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:1628

        Network

        MITRE ATT&CK Matrix ATT&CK v6

        Persistence

        Registry Run Keys / Startup Folder

        1
        T1060

        Defense Evasion

        File Deletion

        2
        T1107

        Modify Registry

        2
        T1112

        Install Root Certificate

        1
        T1130

        Discovery

        Query Registry

        1
        T1012

        Peripheral Device Discovery

        1
        T1120

        System Information Discovery

        1
        T1082

        Command and Control

        Web Service

        1
        T1102

        Impact

        Inhibit System Recovery

        2
        T1490

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\07CEF2F654E3ED6050FFC9B6EB844250_3F26ED5DE6B4E859CCCA6035ECB8D9CB
          MD5

          85934f14cc9248f76c58dc21180b4f15

          SHA1

          5ae41d9bea1cd413260de621f2302febd1e00323

          SHA256

          0d0b47c2e46b455f2d5b2bc0893585790da8a86e36f4a45311bf0a579a5efe58

          SHA512

          8496972fcf149a5df72b1a9aef3865c27fe0b9cba9e3af03b0a562c8b64a89d8834a3c18008d1610fab0741decadfdb1c14f9c1b9d1307bbb23a0b6a148b5e88

        • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\204C1AA6F6114E6A513754A2AB5760FA_0673414C08DE7F919AE3F6C4CC65AEEE
          MD5

          4bddfe3851f7aa064be1b88af5e4516d

          SHA1

          2619398420a8e45f8f68c7c02ff2fd8c5ae3f18a

          SHA256

          1427416bef65c2419a8fc224206c5131d6d7b391bc74faae87859640ce0fc3dc

          SHA512

          1874f93cc946fe5a1f1852f0bb740247cb8835993d7cd217e1347af794b6f606c9ad9c1b6b0604c229296d170961c88d0b31824b9f854d326fe8b10557e84040

        • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
          MD5

          a54e6020d8dade29e93e679d7d067676

          SHA1

          1ff53fa146566b3dc7a4dc43c91650a89b0bca5f

          SHA256

          3762d5141f299aa6d5bb5197aa8459d1741a4602c875a14531b77ebc861c7bbb

          SHA512

          87da29500b7ca80c15eea68253298c50073e2c643aae474b700ddd8117f7eac6bd53fc9a5358aa2bebe513e2041ca101337a13f21f0ef16450607ecc7f57b43d

        • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\07CEF2F654E3ED6050FFC9B6EB844250_3F26ED5DE6B4E859CCCA6035ECB8D9CB
          MD5

          50f7ecae8c22042454f3102f76afdd74

          SHA1

          b355b6e95e3521eed1b11f2fb43063d7946ff2eb

          SHA256

          e0d6d3c4c205a2e9f1887a19847d7bbe10b958648e25bee82c2de91e755cd4c9

          SHA512

          b198b326beaec5db464a536343e30d467200be9442714ad5a85ff9b6ab16be79c2a98f3867b8cb185582401c448704ec5890491ed76fc86b4e614417eeadd79d

        • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\204C1AA6F6114E6A513754A2AB5760FA_0673414C08DE7F919AE3F6C4CC65AEEE
          MD5

          34d6b04d324ac57a7783963b9b7dddfc

          SHA1

          c241ad7f46d92e0353048a64149bdc1674183a8f

          SHA256

          0cd0d960b8b307b1eae1c450d283ce77229489238dddf9332164744890c13816

          SHA512

          9907c7610e97da8d01f3849ffb5597c71575c1e15d6fe80f5f3818f8b9ea24b4d1213cac75f42dfd9a754e592473adf3e0c9ed69aa1bdf3e325cb04190816e86

        • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
          MD5

          02d1a233e8a93d9c59bec35983c02e63

          SHA1

          027b63a488bfaaca5b4bd27d4a16c0e60d78b78d

          SHA256

          831a3de4d5b34d929c8d8b89678b6c4a46fae8a5844a217f045d310454cae4d7

          SHA512

          ce01e8d820b0f5ba42b663f47861e57c8fc41b0e6eb01e15891cc8ed6c854fb540e3730ac83e84ec0853def2e863ca620748f098e04d4e3285580f35d0c5725a

        • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
          MD5

          b86a48ef732298e70da951866142ac23

          SHA1

          6798de65aa13dcee04bbf85f092246f670440739

          SHA256

          65a2bbc49dea73024d1aec8392181f1e84bfe555d0704318a51bac84d1f4fda5

          SHA512

          31f2405676ee467f315287bd3fac51707ee273aac21307ddd1b6e37a90d08cf54a28fc2c5558ceb78bff5819d5e8a644cdf3583d40425dfa5a124afd8d3ac2a7

        • C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\3O0J2C38\Z6CQZJWK.htm
          MD5

          8615e70875c2cc0b9db16027b9adf11d

          SHA1

          4ed62cf405311c0ff562a3c59334a15ddc4f1bf9

          SHA256

          da96949ba6b0567343f144486505c8c8fa1d892fd88c9cbc3ef3d751a570724d

          SHA512

          cd9dfc88dc2af9438b7d6b618d1b62029b3bdf739fc4daa5b37397afd12c4528561b3bf2fc3f3f2adf3fd1f582d5524332441fd30248fcd078e41aa91e17cb73

        • C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\7ISB2KAC\XUEUIXT0.htm
          MD5

          b1cd7c031debba3a5c77b39b6791c1a7

          SHA1

          e5d91e14e9c685b06f00e550d9e189deb2075f76

          SHA256

          57ba053f075e0b80f747f3102ed985687c16a8754d109e7c4d33633269a36aaa

          SHA512

          d2bbefdc1effb52a38964c4cec5990a5a226248eca36f99e446c0c5704436f666bf1cb514e73b8991411d497d3325ecc646cbd5065c364e92ab6b9c5f1ad4a72

        • C:\Users\Admin\AppData\Local\Temp\~temp001.bat
          MD5

          ef572e2c7b1bbd57654b36e8dcfdc37a

          SHA1

          b84c4db6d0dfd415c289d0c8ae099aea4001e3b7

          SHA256

          e6e609db3f387f42bfd16dd9e5695ddc2b73d86ae12baf4f0dfc4edda4a96a64

          SHA512

          b8c014b242e8e8f42da37b75fe96c52cd25ebd366d0b5103bcba5ac041806d13142a62351edecdee583d494d2a120f9b330f6229b1b5fe820e1c7d98981089e9

        • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\smss.exe
          MD5

          574f031251f67bcc6ea9168364d2fbfd

          SHA1

          f5d6140140829eaa550d2ef57b3ca8281b3d79bb

          SHA256

          438d83a22ed38bb2241a99b96d644826522b28327f63055840ee7632d8e95cd8

          SHA512

          d7234b117aabb6a50e8619d4bc3a6d283c53d7a7ee396a67f73985d6e09156ab2fc89ec52bddbd949d9236ecde081cc0123719a474b12966a5beaf910de8a15b

        • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\smss.exe
          MD5

          574f031251f67bcc6ea9168364d2fbfd

          SHA1

          f5d6140140829eaa550d2ef57b3ca8281b3d79bb

          SHA256

          438d83a22ed38bb2241a99b96d644826522b28327f63055840ee7632d8e95cd8

          SHA512

          d7234b117aabb6a50e8619d4bc3a6d283c53d7a7ee396a67f73985d6e09156ab2fc89ec52bddbd949d9236ecde081cc0123719a474b12966a5beaf910de8a15b

        • \Users\Admin\AppData\Roaming\Microsoft\Windows\smss.exe
          MD5

          574f031251f67bcc6ea9168364d2fbfd

          SHA1

          f5d6140140829eaa550d2ef57b3ca8281b3d79bb

          SHA256

          438d83a22ed38bb2241a99b96d644826522b28327f63055840ee7632d8e95cd8

          SHA512

          d7234b117aabb6a50e8619d4bc3a6d283c53d7a7ee396a67f73985d6e09156ab2fc89ec52bddbd949d9236ecde081cc0123719a474b12966a5beaf910de8a15b

        • memory/628-20-0x0000000000000000-mapping.dmp
        • memory/812-19-0x0000000000000000-mapping.dmp
        • memory/816-25-0x0000000000000000-mapping.dmp
        • memory/1028-17-0x0000000000000000-mapping.dmp
        • memory/1192-21-0x0000000000000000-mapping.dmp
        • memory/1392-29-0x0000000000000000-mapping.dmp
        • memory/1560-18-0x0000000000000000-mapping.dmp
        • memory/1572-2-0x000007FEF79D0000-0x000007FEF7C4A000-memory.dmp
          Filesize

          2.5MB

        • memory/1648-22-0x0000000000000000-mapping.dmp
        • memory/1676-27-0x0000000000000000-mapping.dmp
        • memory/1756-23-0x0000000000000000-mapping.dmp
        • memory/1776-28-0x0000000000000000-mapping.dmp
        • memory/1836-6-0x00000000000A0000-0x00000000000A1000-memory.dmp
          Filesize

          4KB

        • memory/1836-7-0x0000000000000000-mapping.dmp
        • memory/1888-4-0x0000000000000000-mapping.dmp