Analysis

  • max time kernel
    54s
  • max time network
    56s
  • platform
    windows7_x64
  • resource
    win7v20210410
  • submitted
    02/08/2021, 06:03

General

  • Target

    8663ed0caec9adcb980a4a7ea23e7984.exe

  • Size

    1.3MB

  • MD5

    8663ed0caec9adcb980a4a7ea23e7984

  • SHA1

    e6dcb19362e88b50ab1990e7032437072f104e98

  • SHA256

    bbe006688e5f74473a5e248bc83651cbb7e9efbe8410abb8d8b84b4a59ed7750

  • SHA512

    fd75e6bde035e103e84322411ca7b4107f1673d03170b940af3066f9f4eb58b063ec244302c8dccab87f5816e2b55a177dc1c1d7f498742fd8e0f24fb64317a9

Malware Config

Extracted

Family

oski

C2

fine.le-pearl.com

Signatures

  • Oski

    Oski is an infostealer targeting browser data, crypto wallets.

  • Deletes itself 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Checks installed software on the system 1 TTPs

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

  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Checks processor information in registry 2 TTPs 1 IoCs

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

  • Creates scheduled task(s) 1 TTPs 1 IoCs

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

  • Kills process with taskkill 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 13 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of WriteProcessMemory 46 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\8663ed0caec9adcb980a4a7ea23e7984.exe
    "C:\Users\Admin\AppData\Local\Temp\8663ed0caec9adcb980a4a7ea23e7984.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2020
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\8663ed0caec9adcb980a4a7ea23e7984.exe"
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1904
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\ImauUieIe.exe"
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:764
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\ImauUieIe" /XML "C:\Users\Admin\AppData\Local\Temp\tmpDCF7.tmp"
      2⤵
      • Creates scheduled task(s)
      PID:992
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\ImauUieIe.exe"
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1176
    • C:\Users\Admin\AppData\Local\Temp\8663ed0caec9adcb980a4a7ea23e7984.exe
      "C:\Users\Admin\AppData\Local\Temp\8663ed0caec9adcb980a4a7ea23e7984.exe"
      2⤵
        PID:1796
      • C:\Users\Admin\AppData\Local\Temp\8663ed0caec9adcb980a4a7ea23e7984.exe
        "C:\Users\Admin\AppData\Local\Temp\8663ed0caec9adcb980a4a7ea23e7984.exe"
        2⤵
          PID:1756
        • C:\Users\Admin\AppData\Local\Temp\8663ed0caec9adcb980a4a7ea23e7984.exe
          "C:\Users\Admin\AppData\Local\Temp\8663ed0caec9adcb980a4a7ea23e7984.exe"
          2⤵
          • Checks processor information in registry
          • Suspicious use of WriteProcessMemory
          PID:864
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe" /c taskkill /pid 864 & erase C:\Users\Admin\AppData\Local\Temp\8663ed0caec9adcb980a4a7ea23e7984.exe & RD /S /Q C:\\ProgramData\\234931577592226\\* & exit
            3⤵
            • Deletes itself
            • Suspicious use of WriteProcessMemory
            PID:824
            • C:\Windows\SysWOW64\taskkill.exe
              taskkill /pid 864
              4⤵
              • Kills process with taskkill
              • Suspicious use of AdjustPrivilegeToken
              PID:1148
        • C:\Users\Admin\AppData\Local\Temp\8663ed0caec9adcb980a4a7ea23e7984.exe
          "C:\Users\Admin\AppData\Local\Temp\8663ed0caec9adcb980a4a7ea23e7984.exe"
          2⤵
            PID:680

        Network

              MITRE ATT&CK Enterprise v6

              Replay Monitor

              Loading Replay Monitor...

              Downloads

              • memory/764-90-0x00000000047B2000-0x00000000047B3000-memory.dmp

                Filesize

                4KB

              • memory/764-84-0x0000000000E00000-0x0000000000E01000-memory.dmp

                Filesize

                4KB

              • memory/764-87-0x00000000047B0000-0x00000000047B1000-memory.dmp

                Filesize

                4KB

              • memory/764-72-0x0000000000C70000-0x0000000000C71000-memory.dmp

                Filesize

                4KB

              • memory/864-77-0x0000000000400000-0x0000000000438000-memory.dmp

                Filesize

                224KB

              • memory/864-91-0x0000000000400000-0x0000000000438000-memory.dmp

                Filesize

                224KB

              • memory/1176-92-0x0000000004960000-0x0000000004961000-memory.dmp

                Filesize

                4KB

              • memory/1176-93-0x0000000004962000-0x0000000004963000-memory.dmp

                Filesize

                4KB

              • memory/1176-94-0x0000000005300000-0x0000000005301000-memory.dmp

                Filesize

                4KB

              • memory/1904-141-0x0000000006500000-0x0000000006501000-memory.dmp

                Filesize

                4KB

              • memory/1904-74-0x0000000004720000-0x0000000004721000-memory.dmp

                Filesize

                4KB

              • memory/1904-88-0x00000000046E0000-0x00000000046E1000-memory.dmp

                Filesize

                4KB

              • memory/1904-131-0x000000007EF30000-0x000000007EF31000-memory.dmp

                Filesize

                4KB

              • memory/1904-105-0x0000000006120000-0x0000000006121000-memory.dmp

                Filesize

                4KB

              • memory/1904-99-0x0000000005FF0000-0x0000000005FF1000-memory.dmp

                Filesize

                4KB

              • memory/1904-89-0x00000000046E2000-0x00000000046E3000-memory.dmp

                Filesize

                4KB

              • memory/1904-112-0x0000000006280000-0x0000000006281000-memory.dmp

                Filesize

                4KB

              • memory/1904-142-0x0000000006510000-0x0000000006511000-memory.dmp

                Filesize

                4KB

              • memory/1904-122-0x0000000005610000-0x0000000005611000-memory.dmp

                Filesize

                4KB

              • memory/1904-104-0x0000000006090000-0x0000000006091000-memory.dmp

                Filesize

                4KB

              • memory/1904-66-0x0000000076281000-0x0000000076283000-memory.dmp

                Filesize

                8KB

              • memory/2020-64-0x0000000000590000-0x00000000005C3000-memory.dmp

                Filesize

                204KB

              • memory/2020-63-0x00000000094A0000-0x000000000953A000-memory.dmp

                Filesize

                616KB

              • memory/2020-62-0x00000000003A0000-0x00000000003AD000-memory.dmp

                Filesize

                52KB

              • memory/2020-61-0x0000000004410000-0x0000000004411000-memory.dmp

                Filesize

                4KB

              • memory/2020-59-0x00000000001B0000-0x00000000001B1000-memory.dmp

                Filesize

                4KB