Analysis

  • max time kernel
    157s
  • max time network
    154s
  • platform
    windows7_x64
  • resource
    win7-en-20210916
  • submitted
    18-09-2021 01:18

General

  • Target

    672300912.xlsx

  • Size

    588KB

  • MD5

    f45c96d01984b479b9c586f7686e0727

  • SHA1

    4a0293afdd747d2b75bc686e6d2556a6271dc413

  • SHA256

    d590113d786474dda028703f5cf2dbf1e2f4c03ae06e4032af83bdefaa670216

  • SHA512

    2f6ceebc0872412716780f872303f3b1363c684ebc11c7c0771748d390ec37acd2c652f779e262622e9a9aec26a11a6ab99993255b5503059ca2cc1aa0d51fc5

Malware Config

Signatures

  • Detect Neshta Payload 3 IoCs
  • Modifies system executable filetype association 2 TTPs 1 IoCs
  • Neshta

    Malware from the neshta family is designed to infect itself into other files to spread itself and cause damage.

  • Looks for VirtualBox Guest Additions in registry 2 TTPs
  • Blocklisted process makes network request 1 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 1 IoCs
  • Looks for VMWare Tools registry key 2 TTPs
  • Checks BIOS information in registry 2 TTPs 2 IoCs

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

  • Loads dropped DLL 8 IoCs
  • Uses the VBS compiler for execution 1 TTPs
  • Maps connected drives based on registry 3 TTPs 2 IoCs

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

  • Suspicious use of SetThreadContext 1 IoCs
  • Drops file in Program Files directory 64 IoCs
  • Drops file in Windows directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Enumerates system info in registry 2 TTPs 1 IoCs
  • Launches Equation Editor 1 TTPs 1 IoCs

    Equation Editor is an old Office component often targeted by exploits such as CVE-2017-11882.

  • Modifies Internet Explorer settings 1 TTPs 31 IoCs
  • Modifies registry class 64 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 10 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of SetWindowsHookEx 5 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE
    "C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" /dde C:\Users\Admin\AppData\Local\Temp\672300912.xlsx
    1⤵
    • Enumerates system info in registry
    • Modifies Internet Explorer settings
    • Modifies registry class
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious use of SetWindowsHookEx
    PID:368
  • C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE
    "C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE" -Embedding
    1⤵
    • Blocklisted process makes network request
    • Loads dropped DLL
    • Launches Equation Editor
    • Suspicious use of WriteProcessMemory
    PID:1136
    • C:\Users\Public\vbc.exe
      "C:\Users\Public\vbc.exe"
      2⤵
      • Executes dropped EXE
      • Checks BIOS information in registry
      • Maps connected drives based on registry
      • Suspicious use of SetThreadContext
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1764
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\PaJrxje" /XML "C:\Users\Admin\AppData\Local\Temp\tmp5659.tmp"
        3⤵
        • Creates scheduled task(s)
        PID:772
      • C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
        "C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe"
        3⤵
          PID:520
        • C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
          "C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe"
          3⤵
            PID:1904
          • C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
            "C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe"
            3⤵
              PID:1404
            • C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
              "C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe"
              3⤵
                PID:1784
              • C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
                "C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe"
                3⤵
                • Modifies system executable filetype association
                • Loads dropped DLL
                • Drops file in Program Files directory
                • Drops file in Windows directory
                • Modifies registry class
                PID:988

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          • C:\Users\Admin\AppData\Local\MICROS~1\Windows\TEMPOR~1\Content.IE5\UL9KF5IE\VBC_1_~1.EXE
            MD5

            66ce1420280eceebeab924165f28b7bb

            SHA1

            7355e30b88eb71f34fa37df9dcfcb8fc91013fd4

            SHA256

            56331fa6c35d48c153e5004cb8574c36e2c16f3bb339e53549dc28ec7ad0f232

            SHA512

            8fed800ba457321903af29448b6c31b017393572f32b61f0c9fb4c028375e4937356348e6bbcdf7a2ec37484bd9e3cecfcb84d1212dfb45e2c6a4fe3fa026369

          • C:\Users\Admin\AppData\Roaming\PaJrxje.exe
            MD5

            66ce1420280eceebeab924165f28b7bb

            SHA1

            7355e30b88eb71f34fa37df9dcfcb8fc91013fd4

            SHA256

            56331fa6c35d48c153e5004cb8574c36e2c16f3bb339e53549dc28ec7ad0f232

            SHA512

            8fed800ba457321903af29448b6c31b017393572f32b61f0c9fb4c028375e4937356348e6bbcdf7a2ec37484bd9e3cecfcb84d1212dfb45e2c6a4fe3fa026369

          • C:\Users\Public\vbc.exe
            MD5

            66ce1420280eceebeab924165f28b7bb

            SHA1

            7355e30b88eb71f34fa37df9dcfcb8fc91013fd4

            SHA256

            56331fa6c35d48c153e5004cb8574c36e2c16f3bb339e53549dc28ec7ad0f232

            SHA512

            8fed800ba457321903af29448b6c31b017393572f32b61f0c9fb4c028375e4937356348e6bbcdf7a2ec37484bd9e3cecfcb84d1212dfb45e2c6a4fe3fa026369

          • C:\Users\Public\vbc.exe
            MD5

            66ce1420280eceebeab924165f28b7bb

            SHA1

            7355e30b88eb71f34fa37df9dcfcb8fc91013fd4

            SHA256

            56331fa6c35d48c153e5004cb8574c36e2c16f3bb339e53549dc28ec7ad0f232

            SHA512

            8fed800ba457321903af29448b6c31b017393572f32b61f0c9fb4c028375e4937356348e6bbcdf7a2ec37484bd9e3cecfcb84d1212dfb45e2c6a4fe3fa026369

          • \PROGRA~2\Adobe\READER~1.0\Reader\LOGTRA~1.EXE
            MD5

            9e2b9928c89a9d0da1d3e8f4bd96afa7

            SHA1

            ec66cda99f44b62470c6930e5afda061579cde35

            SHA256

            8899b4ed3446b7d55b54defbc1acb7c5392a4b3bc8ec2cdc7c31171708965043

            SHA512

            2ca5ad1d0e12a8049de885b90b7f56fe77c868e0d6dae4ec4b6f3bc0bf7b2e73295cc9b1328c2b45357ffb0d7804622ab3f91a56140b098e93b691032d508156

          • \Users\Admin\AppData\Local\MICROS~1\Windows\TEMPOR~1\Content.IE5\UL9KF5IE\VBC_1_~1.EXE
            MD5

            66ce1420280eceebeab924165f28b7bb

            SHA1

            7355e30b88eb71f34fa37df9dcfcb8fc91013fd4

            SHA256

            56331fa6c35d48c153e5004cb8574c36e2c16f3bb339e53549dc28ec7ad0f232

            SHA512

            8fed800ba457321903af29448b6c31b017393572f32b61f0c9fb4c028375e4937356348e6bbcdf7a2ec37484bd9e3cecfcb84d1212dfb45e2c6a4fe3fa026369

          • \Users\Admin\AppData\Roaming\PaJrxje.exe
            MD5

            66ce1420280eceebeab924165f28b7bb

            SHA1

            7355e30b88eb71f34fa37df9dcfcb8fc91013fd4

            SHA256

            56331fa6c35d48c153e5004cb8574c36e2c16f3bb339e53549dc28ec7ad0f232

            SHA512

            8fed800ba457321903af29448b6c31b017393572f32b61f0c9fb4c028375e4937356348e6bbcdf7a2ec37484bd9e3cecfcb84d1212dfb45e2c6a4fe3fa026369

          • \Users\Public\vbc.exe
            MD5

            66ce1420280eceebeab924165f28b7bb

            SHA1

            7355e30b88eb71f34fa37df9dcfcb8fc91013fd4

            SHA256

            56331fa6c35d48c153e5004cb8574c36e2c16f3bb339e53549dc28ec7ad0f232

            SHA512

            8fed800ba457321903af29448b6c31b017393572f32b61f0c9fb4c028375e4937356348e6bbcdf7a2ec37484bd9e3cecfcb84d1212dfb45e2c6a4fe3fa026369

          • \Users\Public\vbc.exe
            MD5

            66ce1420280eceebeab924165f28b7bb

            SHA1

            7355e30b88eb71f34fa37df9dcfcb8fc91013fd4

            SHA256

            56331fa6c35d48c153e5004cb8574c36e2c16f3bb339e53549dc28ec7ad0f232

            SHA512

            8fed800ba457321903af29448b6c31b017393572f32b61f0c9fb4c028375e4937356348e6bbcdf7a2ec37484bd9e3cecfcb84d1212dfb45e2c6a4fe3fa026369

          • \Users\Public\vbc.exe
            MD5

            66ce1420280eceebeab924165f28b7bb

            SHA1

            7355e30b88eb71f34fa37df9dcfcb8fc91013fd4

            SHA256

            56331fa6c35d48c153e5004cb8574c36e2c16f3bb339e53549dc28ec7ad0f232

            SHA512

            8fed800ba457321903af29448b6c31b017393572f32b61f0c9fb4c028375e4937356348e6bbcdf7a2ec37484bd9e3cecfcb84d1212dfb45e2c6a4fe3fa026369

          • \Users\Public\vbc.exe
            MD5

            66ce1420280eceebeab924165f28b7bb

            SHA1

            7355e30b88eb71f34fa37df9dcfcb8fc91013fd4

            SHA256

            56331fa6c35d48c153e5004cb8574c36e2c16f3bb339e53549dc28ec7ad0f232

            SHA512

            8fed800ba457321903af29448b6c31b017393572f32b61f0c9fb4c028375e4937356348e6bbcdf7a2ec37484bd9e3cecfcb84d1212dfb45e2c6a4fe3fa026369

          • \Users\Public\vbc.exe
            MD5

            66ce1420280eceebeab924165f28b7bb

            SHA1

            7355e30b88eb71f34fa37df9dcfcb8fc91013fd4

            SHA256

            56331fa6c35d48c153e5004cb8574c36e2c16f3bb339e53549dc28ec7ad0f232

            SHA512

            8fed800ba457321903af29448b6c31b017393572f32b61f0c9fb4c028375e4937356348e6bbcdf7a2ec37484bd9e3cecfcb84d1212dfb45e2c6a4fe3fa026369

          • memory/368-53-0x000000002FC71000-0x000000002FC74000-memory.dmp
            Filesize

            12KB

          • memory/368-82-0x000000005FFF0000-0x0000000060000000-memory.dmp
            Filesize

            64KB

          • memory/368-68-0x00000000059B0000-0x0000000005AC0000-memory.dmp
            Filesize

            1.1MB

          • memory/368-54-0x00000000719B1000-0x00000000719B3000-memory.dmp
            Filesize

            8KB

          • memory/368-55-0x000000005FFF0000-0x0000000060000000-memory.dmp
            Filesize

            64KB

          • memory/772-71-0x0000000000000000-mapping.dmp
          • memory/988-72-0x0000000000400000-0x000000000041B000-memory.dmp
            Filesize

            108KB

          • memory/988-73-0x00000000004080E4-mapping.dmp
          • memory/988-75-0x0000000000400000-0x000000000041B000-memory.dmp
            Filesize

            108KB

          • memory/1136-56-0x0000000076851000-0x0000000076853000-memory.dmp
            Filesize

            8KB

          • memory/1764-61-0x0000000000000000-mapping.dmp
          • memory/1764-64-0x0000000001230000-0x0000000001231000-memory.dmp
            Filesize

            4KB

          • memory/1764-70-0x00000000059E0000-0x0000000005A60000-memory.dmp
            Filesize

            512KB

          • memory/1764-69-0x00000000057A0000-0x0000000005844000-memory.dmp
            Filesize

            656KB

          • memory/1764-67-0x0000000000520000-0x0000000000527000-memory.dmp
            Filesize

            28KB

          • memory/1764-66-0x0000000004E10000-0x0000000004E11000-memory.dmp
            Filesize

            4KB