Analysis

  • max time kernel
    138s
  • max time network
    134s
  • platform
    windows7_x64
  • resource
    win7-en-20210920
  • submitted
    26-09-2021 19:27

General

  • Target

    42752f5ad56e5b7db47f5cade7e84abc.exe

  • Size

    852KB

  • MD5

    42752f5ad56e5b7db47f5cade7e84abc

  • SHA1

    e1cb9c502536f14f0760c4404b307a4804cb14c8

  • SHA256

    926962feeeae5258e6d7bc03c9561cb19912e44b587a1eb30f54f52db479254c

  • SHA512

    bd41b3d06af5fce351309c6fc05a77aed088be5726a7cfe5b76b2fd05eb962d53c8733adb33ee066fd562d069b4805792aecf280b1f74994f97f7be3db11aa6b

Malware Config

Extracted

Family

agenttesla

Credentials

  • Protocol:
    smtp
  • Host:
    smtp.mail.ru
  • Port:
    587
  • Username:
    [email protected]
  • Password:
    PxhrKDkvikRcSaP2dkv9

Extracted

Family

oski

C2

schulenburgrvpark.com

Signatures

  • AgentTesla

    Agent Tesla is a remote access tool (RAT) written in visual basic.

  • Oski

    Oski is an infostealer targeting browser data, crypto wallets.

  • suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)

    suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)

  • suricata: ET MALWARE Terse alphanumeric executable downloader high likelihood of being hostile

    suricata: ET MALWARE Terse alphanumeric executable downloader high likelihood of being hostile

  • suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil

    suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil

  • AgentTesla Payload 3 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 7 IoCs
  • Reads data files stored by FTP clients 2 TTPs

    Tries to access configuration files associated with programs like FileZilla.

  • Reads user/profile data of local email clients 2 TTPs

    Email clients store some user data on disk where infostealers will often target it.

  • 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
  • Adds Run key to start application 2 TTPs 1 IoCs
  • 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 2 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 2 IoCs

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

  • Kills process with taskkill 1 IoCs
  • Modifies registry class 9 IoCs
  • Suspicious behavior: EnumeratesProcesses 14 IoCs
  • Suspicious use of AdjustPrivilegeToken 6 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 59 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\42752f5ad56e5b7db47f5cade7e84abc.exe
    "C:\Users\Admin\AppData\Local\Temp\42752f5ad56e5b7db47f5cade7e84abc.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1528
    • 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\42752f5ad56e5b7db47f5cade7e84abc.exe"
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1592
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\tlZLQDWEhCq" /XML "C:\Users\Admin\AppData\Local\Temp\tmp477A.tmp"
      2⤵
      • Creates scheduled task(s)
      PID:816
    • C:\Users\Admin\AppData\Local\Temp\42752f5ad56e5b7db47f5cade7e84abc.exe
      "C:\Users\Admin\AppData\Local\Temp\42752f5ad56e5b7db47f5cade7e84abc.exe"
      2⤵
        PID:1964
      • C:\Users\Admin\AppData\Local\Temp\42752f5ad56e5b7db47f5cade7e84abc.exe
        "C:\Users\Admin\AppData\Local\Temp\42752f5ad56e5b7db47f5cade7e84abc.exe"
        2⤵
          PID:1928
        • C:\Users\Admin\AppData\Local\Temp\42752f5ad56e5b7db47f5cade7e84abc.exe
          "C:\Users\Admin\AppData\Local\Temp\42752f5ad56e5b7db47f5cade7e84abc.exe"
          2⤵
            PID:1252
          • C:\Users\Admin\AppData\Local\Temp\42752f5ad56e5b7db47f5cade7e84abc.exe
            "C:\Users\Admin\AppData\Local\Temp\42752f5ad56e5b7db47f5cade7e84abc.exe"
            2⤵
            • Loads dropped DLL
            • Adds Run key to start application
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of SetWindowsHookEx
            • Suspicious use of WriteProcessMemory
            PID:1084
            • C:\Users\Admin\AppData\Local\Temp\app.exe
              "C:\Users\Admin\AppData\Local\Temp\app.exe"
              3⤵
              • Executes dropped EXE
              • Loads dropped DLL
              • Suspicious use of SetThreadContext
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              • Suspicious use of WriteProcessMemory
              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\Local\Temp\app.exe"
                4⤵
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:1944
              • C:\Windows\SysWOW64\schtasks.exe
                "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\vhdkcrwsNOIJ" /XML "C:\Users\Admin\AppData\Local\Temp\tmp8C57.tmp"
                4⤵
                • Creates scheduled task(s)
                PID:1448
              • C:\Users\Admin\AppData\Local\Temp\app.exe
                "C:\Users\Admin\AppData\Local\Temp\app.exe"
                4⤵
                • Executes dropped EXE
                • Loads dropped DLL
                • Checks processor information in registry
                • Suspicious use of WriteProcessMemory
                PID:892
                • C:\Windows\SysWOW64\cmd.exe
                  "C:\Windows\System32\cmd.exe" /c taskkill /pid 892 & erase C:\Users\Admin\AppData\Local\Temp\app.exe & RD /S /Q C:\\ProgramData\\033182535918034\\* & exit
                  5⤵
                  • Suspicious use of WriteProcessMemory
                  PID:1700
                  • C:\Windows\SysWOW64\taskkill.exe
                    taskkill /pid 892
                    6⤵
                    • Kills process with taskkill
                    • Suspicious use of AdjustPrivilegeToken
                    PID:1716

        Network

        MITRE ATT&CK Matrix ATT&CK v6

        Execution

        Scheduled Task

        1
        T1053

        Persistence

        Registry Run Keys / Startup Folder

        1
        T1060

        Scheduled Task

        1
        T1053

        Privilege Escalation

        Scheduled Task

        1
        T1053

        Defense Evasion

        Modify Registry

        1
        T1112

        Credential Access

        Credentials in Files

        4
        T1081

        Discovery

        Query Registry

        2
        T1012

        System Information Discovery

        2
        T1082

        Collection

        Data from Local System

        4
        T1005

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Users\Admin\AppData\Local\Temp\app.exe
          MD5

          9a1c9056f35e3923800d334987f671e4

          SHA1

          919904d34d8992084e2646b6243872698d7e72d3

          SHA256

          cb282f663b4ad5bbe80246cb866afafea7b90aa3219ba62f1aac5f22c6b6040f

          SHA512

          5e45a87974b6d41d38b247d79bd63bd58ae679836b37d3a3e30234a9cb7f31aadad66e3f90e419b9e4e890314573f2868fd98660f2ed82f05a175febfdb6be09

        • C:\Users\Admin\AppData\Local\Temp\app.exe
          MD5

          9a1c9056f35e3923800d334987f671e4

          SHA1

          919904d34d8992084e2646b6243872698d7e72d3

          SHA256

          cb282f663b4ad5bbe80246cb866afafea7b90aa3219ba62f1aac5f22c6b6040f

          SHA512

          5e45a87974b6d41d38b247d79bd63bd58ae679836b37d3a3e30234a9cb7f31aadad66e3f90e419b9e4e890314573f2868fd98660f2ed82f05a175febfdb6be09

        • C:\Users\Admin\AppData\Local\Temp\app.exe
          MD5

          9a1c9056f35e3923800d334987f671e4

          SHA1

          919904d34d8992084e2646b6243872698d7e72d3

          SHA256

          cb282f663b4ad5bbe80246cb866afafea7b90aa3219ba62f1aac5f22c6b6040f

          SHA512

          5e45a87974b6d41d38b247d79bd63bd58ae679836b37d3a3e30234a9cb7f31aadad66e3f90e419b9e4e890314573f2868fd98660f2ed82f05a175febfdb6be09

        • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\d93f411851d7c929.customDestinations-ms
          MD5

          a18f896d0f6df40525af84d4bbf075a5

          SHA1

          55e3a2e315136df7ff85a0abf2b8564b037b8e75

          SHA256

          375471a3f8f40da4de56c0df92c4222e7afd7aff0f71f96f0a0a7743aa0b2f00

          SHA512

          c4a14446b980f299769feb03e0d1fa3975a6a049db7720b14b40bb30d3239ba3266c4533fb45abf1f2ce9adb44754e34a6db0d679474758cb20cabe6a011955a

        • \ProgramData\mozglue.dll
          MD5

          8f73c08a9660691143661bf7332c3c27

          SHA1

          37fa65dd737c50fda710fdbde89e51374d0c204a

          SHA256

          3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

          SHA512

          0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

        • \ProgramData\msvcp140.dll
          MD5

          109f0f02fd37c84bfc7508d4227d7ed5

          SHA1

          ef7420141bb15ac334d3964082361a460bfdb975

          SHA256

          334e69ac9367f708ce601a6f490ff227d6c20636da5222f148b25831d22e13d4

          SHA512

          46eb62b65817365c249b48863d894b4669e20fcb3992e747cd5c9fdd57968e1b2cf7418d1c9340a89865eadda362b8db51947eb4427412eb83b35994f932fd39

        • \ProgramData\nss3.dll
          MD5

          bfac4e3c5908856ba17d41edcd455a51

          SHA1

          8eec7e888767aa9e4cca8ff246eb2aacb9170428

          SHA256

          e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

          SHA512

          2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

        • \ProgramData\sqlite3.dll
          MD5

          e477a96c8f2b18d6b5c27bde49c990bf

          SHA1

          e980c9bf41330d1e5bd04556db4646a0210f7409

          SHA256

          16574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660

          SHA512

          335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c

        • \ProgramData\vcruntime140.dll
          MD5

          7587bf9cb4147022cd5681b015183046

          SHA1

          f2106306a8f6f0da5afb7fc765cfa0757ad5a628

          SHA256

          c40bb03199a2054dabfc7a8e01d6098e91de7193619effbd0f142a7bf031c14d

          SHA512

          0b63e4979846ceba1b1ed8470432ea6aa18cca66b5f5322d17b14bc0dfa4b2ee09ca300a016e16a01db5123e4e022820698f46d9bad1078bd24675b4b181e91f

        • \Users\Admin\AppData\Local\Temp\app.exe
          MD5

          9a1c9056f35e3923800d334987f671e4

          SHA1

          919904d34d8992084e2646b6243872698d7e72d3

          SHA256

          cb282f663b4ad5bbe80246cb866afafea7b90aa3219ba62f1aac5f22c6b6040f

          SHA512

          5e45a87974b6d41d38b247d79bd63bd58ae679836b37d3a3e30234a9cb7f31aadad66e3f90e419b9e4e890314573f2868fd98660f2ed82f05a175febfdb6be09

        • \Users\Admin\AppData\Local\Temp\app.exe
          MD5

          9a1c9056f35e3923800d334987f671e4

          SHA1

          919904d34d8992084e2646b6243872698d7e72d3

          SHA256

          cb282f663b4ad5bbe80246cb866afafea7b90aa3219ba62f1aac5f22c6b6040f

          SHA512

          5e45a87974b6d41d38b247d79bd63bd58ae679836b37d3a3e30234a9cb7f31aadad66e3f90e419b9e4e890314573f2868fd98660f2ed82f05a175febfdb6be09

        • memory/816-62-0x0000000000000000-mapping.dmp
        • memory/892-90-0x0000000000400000-0x0000000000438000-memory.dmp
          Filesize

          224KB

        • memory/892-85-0x000000000040717B-mapping.dmp
        • memory/892-84-0x0000000000400000-0x0000000000438000-memory.dmp
          Filesize

          224KB

        • memory/992-77-0x0000000000620000-0x0000000000627000-memory.dmp
          Filesize

          28KB

        • memory/992-78-0x00000000023B0000-0x00000000023B1000-memory.dmp
          Filesize

          4KB

        • memory/992-72-0x0000000000000000-mapping.dmp
        • memory/992-80-0x0000000000740000-0x000000000077C000-memory.dmp
          Filesize

          240KB

        • memory/992-75-0x0000000000DA0000-0x0000000000DA1000-memory.dmp
          Filesize

          4KB

        • memory/992-79-0x00000000051E0000-0x000000000524C000-memory.dmp
          Filesize

          432KB

        • memory/1084-65-0x0000000000400000-0x000000000043C000-memory.dmp
          Filesize

          240KB

        • memory/1084-101-0x0000000004971000-0x0000000004972000-memory.dmp
          Filesize

          4KB

        • memory/1084-63-0x0000000000400000-0x000000000043C000-memory.dmp
          Filesize

          240KB

        • memory/1084-67-0x0000000004970000-0x0000000004971000-memory.dmp
          Filesize

          4KB

        • memory/1084-64-0x00000000004377DE-mapping.dmp
        • memory/1448-82-0x0000000000000000-mapping.dmp
        • memory/1528-58-0x0000000005630000-0x000000000569D000-memory.dmp
          Filesize

          436KB

        • memory/1528-59-0x0000000004340000-0x0000000004383000-memory.dmp
          Filesize

          268KB

        • memory/1528-56-0x0000000004A30000-0x0000000004A31000-memory.dmp
          Filesize

          4KB

        • memory/1528-57-0x00000000007A0000-0x00000000007BD000-memory.dmp
          Filesize

          116KB

        • memory/1528-54-0x0000000000250000-0x0000000000251000-memory.dmp
          Filesize

          4KB

        • memory/1592-61-0x0000000074B91000-0x0000000074B93000-memory.dmp
          Filesize

          8KB

        • memory/1592-60-0x0000000000000000-mapping.dmp
        • memory/1592-70-0x0000000001DD2000-0x0000000001DD4000-memory.dmp
          Filesize

          8KB

        • memory/1592-68-0x0000000001DD0000-0x0000000001DD1000-memory.dmp
          Filesize

          4KB

        • memory/1592-69-0x0000000001DD1000-0x0000000001DD2000-memory.dmp
          Filesize

          4KB

        • memory/1700-99-0x0000000000000000-mapping.dmp
        • memory/1716-100-0x0000000000000000-mapping.dmp
        • memory/1944-92-0x0000000002380000-0x0000000002FCA000-memory.dmp
          Filesize

          12.3MB

        • memory/1944-93-0x0000000002380000-0x0000000002FCA000-memory.dmp
          Filesize

          12.3MB

        • memory/1944-91-0x0000000002380000-0x0000000002FCA000-memory.dmp
          Filesize

          12.3MB

        • memory/1944-81-0x0000000000000000-mapping.dmp