Resubmissions

10-04-2024 02:58

240410-dgn9kacd46 10

10-04-2024 02:58

240410-dgnm2aff7x 10

10-04-2024 02:58

240410-dgnb9sff7w 10

10-04-2024 02:58

240410-dgm2haff7v 10

23-08-2023 14:58

230823-sb7laaed41 10

Analysis

  • max time kernel
    117s
  • max time network
    300s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    10-04-2024 02:58

General

  • Target

    loader.exe

  • Size

    401KB

  • MD5

    69e3cdc923b668aec4cb405c040565c6

  • SHA1

    6a675ebf6f241e543f7bb50ccc8ead462a427880

  • SHA256

    8d647fd3ebb00c9d853eb728ff7cba75b7a089d30f84090e3bc1dc460bdd47f3

  • SHA512

    5580919f6710fc210f079875eae22a87c85e854b57f59d10fc22680460f370154d7d223a66c9797387e4675a7954ba6f051a34571499481927980eb9ebf07cdb

  • SSDEEP

    6144:+CGmWI/2hvRn6Ie646G0D1eBlxy9bAmI6:+KWI/8B6Q9b5eBlxnmI6

Malware Config

Extracted

Family

gurcu

C2

https://api.telegram.org/bot6193093056:AAHzyNGUGS9aUG6CCx6ENLoXpCFLzEQywIQ/sendMessage?chat_id=1098292643

Signatures

  • Gurcu, WhiteSnake

    Gurcu is a malware stealer written in C#.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 2 IoCs
  • Reads WinSCP keys stored on the system 2 TTPs

    Tries to access WinSCP stored sessions.

  • Reads user/profile data of web browsers 2 TTPs

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

  • Accesses Microsoft Outlook profiles 1 TTPs 6 IoCs
  • Looks up external IP address via web service 2 IoCs

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

  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 1 IoCs

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

  • Modifies system certificate store 2 TTPs 8 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 24 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

  • outlook_office_path 1 IoCs
  • outlook_win_path 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\loader.exe
    "C:\Users\Admin\AppData\Local\Temp\loader.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2776
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "loader" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\loader.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\loader.exe" &&START "" "C:\Users\Admin\AppData\Local\TeamViewer\loader.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:1616
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2956
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2516
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "loader" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\loader.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2800
        • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
          "C:\Users\Admin\AppData\Local\TeamViewer\loader.exe"
          3⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Modifies system certificate store
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2788
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2788 -s 4356
            4⤵
              PID:2892
      • C:\Windows\system32\taskeng.exe
        taskeng.exe {CDA79477-996B-46B4-8CFA-548F6AB3C150} S-1-5-21-330940541-141609230-1670313778-1000:KXIPPCKF\Admin:Interactive:[1]
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:2596
        • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
          C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
          2⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          • outlook_office_path
          • outlook_win_path
          PID:1532
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 1532 -s 3888
            3⤵
              PID:1608

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

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

          Filesize

          68KB

          MD5

          29f65ba8e88c063813cc50a4ea544e93

          SHA1

          05a7040d5c127e68c25d81cc51271ffb8bef3568

          SHA256

          1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184

          SHA512

          e29b2e92c496245bed3372578074407e8ef8882906ce10c35b3c8deebfefe01b5fd7f3030acaa693e175f4b7aca6cd7d8d10ae1c731b09c5fa19035e005de3aa

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

          Filesize

          344B

          MD5

          9cbc5c98ab83f9aa3bdfec5df3a7eb96

          SHA1

          ee8886f7d0c724808ca34c9f66f940df49386302

          SHA256

          6af5e8b15ef309ded7c959f7d6bf02944e34aba1550949c95e5bc94be544002c

          SHA512

          6d55cb48c9542c9efd682ca1cbfe01c9442e1ed9cb8b8806a47d0180e21d935055d06457fa69aa51874588a0e26097db2615543593d1f58bb9caa77a4067f46b

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

          Filesize

          344B

          MD5

          b59f6f6fb377ccff7028b3ad101bea66

          SHA1

          5eddeff1804cf0b449aeef50e69d18091a5277d0

          SHA256

          6894d79627cb8cfa8f958347777a1fca193a7f70f6cce25c3f68f027311b49b5

          SHA512

          49677a924832461a30e7cfce1d80ecb1a69d77ff105ad4c049f0572fb5cdbf4ffaa8d14e6086304c5a6d936def6148e73812271c9500f4c044037cb918ec435e

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

          Filesize

          344B

          MD5

          5b63c09c4c3ae0397e0713f97bf8c6c0

          SHA1

          923ead508f6f047add2b776788287715daafbbef

          SHA256

          0a89f70b3dfa03d19b9f5e0b9cf3dc98f64ac760097a826ac4499a745962d9d7

          SHA512

          536ef75f790875246c6a0d3c553ee0840ffc1fabd1df7f55c040da9f458e4e151b109b84f37f507f3e5f42b258917430bdd0c289bb2959f3c8b88226831bdca2

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

          Filesize

          344B

          MD5

          661d66fa49cfe2720665e45e7f7ad82e

          SHA1

          5750c51fb9714a8792d844bf4502c9ca6a16f4de

          SHA256

          5964cc0fcedb743713b62e0f6a2b58760717cc0157e099d4db5ba4410909531a

          SHA512

          98019f6d54feb197889c2cbb687130acefc40db8c92166596ddec501134af4f1d2909a68e5e1906789a4eeeed99b8d02bdee831be754769bad55b3e812315447

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

          Filesize

          344B

          MD5

          ea31abc613cdd2420ff839cf68fb57d0

          SHA1

          be48a7c5281b4e52945a5d7c6de5c05f83b0dd85

          SHA256

          7bcd143b52049f1b700ee223a1ac96c69ed0746d8abebe7065a89a8a7110c3c1

          SHA512

          3638b1df7481b16b6bf0327d76883f693c1683fef387225d2dea9aaae02e72946f50fff73c8fff2dd5738c785448c70fcaa708034e5aaa6d38a93435ce94ed5b

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

          Filesize

          344B

          MD5

          fd3152242be74822453b62f02e2242c4

          SHA1

          a681feb33c797f05ab9b70de742a1063fd4ae9f4

          SHA256

          87793ce667c31ae3915979af8f81499917583963cd88949185ca3beb2e46891b

          SHA512

          82884a1b7d6652f1576ec8381531e890c0ab3102aa09e8c4b5d4932ca44477d9d0245cddf5437c5bd2f198702efcc6e2398728be8a02a83fafd1521fb53923b9

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

          Filesize

          344B

          MD5

          c31d56a743bd40332674d998009cdebc

          SHA1

          29029827854b5eb557cc667cb2f9934b42d5e838

          SHA256

          696fbf800d8874f0d8624267577e804619d832e5126c6ac123388b5ce38bbb72

          SHA512

          70920a401708b3be223549f89a1b936573d1ec76d1633391568045c627c3bea21e4ba3785e6370fac9f697f17e8a5f76bae85d76f0d3383ada4dd99bde0c0e5e

        • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe

          Filesize

          401KB

          MD5

          69e3cdc923b668aec4cb405c040565c6

          SHA1

          6a675ebf6f241e543f7bb50ccc8ead462a427880

          SHA256

          8d647fd3ebb00c9d853eb728ff7cba75b7a089d30f84090e3bc1dc460bdd47f3

          SHA512

          5580919f6710fc210f079875eae22a87c85e854b57f59d10fc22680460f370154d7d223a66c9797387e4675a7954ba6f051a34571499481927980eb9ebf07cdb

        • C:\Users\Admin\AppData\Local\Temp\CabB4B2.tmp

          Filesize

          65KB

          MD5

          ac05d27423a85adc1622c714f2cb6184

          SHA1

          b0fe2b1abddb97837ea0195be70ab2ff14d43198

          SHA256

          c6456e12e5e53287a547af4103e0397cb9697e466cf75844312dc296d43d144d

          SHA512

          6d0ef9050e41fbae680e0e59dd0f90b6ac7fea5579ef5708b69d5da33a0ece7e8b16574b58b17b64a34cc34a4ffc22b4a62c1ece61f36c4a11a0665e0536b90d

        • C:\Users\Admin\AppData\Local\Temp\TarB4D4.tmp

          Filesize

          171KB

          MD5

          9c0c641c06238516f27941aa1166d427

          SHA1

          64cd549fb8cf014fcd9312aa7a5b023847b6c977

          SHA256

          4276af3669a141a59388bc56a87f6614d9a9bdddf560636c264219a7eb11256f

          SHA512

          936ed0c0b0a7ff8e606b1cc4175a1f9b3699748ccbba1c3aff96203033d2e9edabf090e5148370df42fbfc4e31d7229493706ff24f19ff42ff7bef74a6baad06

        • C:\Users\Admin\AppData\Local\Temp\TarB660.tmp

          Filesize

          177KB

          MD5

          435a9ac180383f9fa094131b173a2f7b

          SHA1

          76944ea657a9db94f9a4bef38f88c46ed4166983

          SHA256

          67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34

          SHA512

          1a6b277611959720a9c71114957620517ad94541302f164eb872bd322292a952409bafb8bc2ac793b16ad5f25d83f8594ccff2b7834e3c2b2b941e6fc84c009a

        • C:\Users\Admin\AppData\Local\jjmzzxbvaf\port.dat

          Filesize

          4B

          MD5

          dc0439caeb74ffc2795571af07a7eab1

          SHA1

          9c990648bdc355e049db1fce4bff6836208c1ce2

          SHA256

          5d38d5f6a62353b6afff5d41fe170aa7e6c1eb33eb5fd8fa2cf4ba004b0a9640

          SHA512

          191feb5625ff066c80fbfb4f645a2b193942d51a2782c0c24a999509dc2355395f5c2bdb3e0c46de5cb15da32590530764194ae790a1293838007b7460f8edad

        • memory/1532-415-0x0000000001F40000-0x0000000001FC0000-memory.dmp

          Filesize

          512KB

        • memory/1532-455-0x0000000001F40000-0x0000000001FC0000-memory.dmp

          Filesize

          512KB

        • memory/1532-454-0x000007FEF5250000-0x000007FEF5C3C000-memory.dmp

          Filesize

          9.9MB

        • memory/1532-414-0x000007FEF5250000-0x000007FEF5C3C000-memory.dmp

          Filesize

          9.9MB

        • memory/2776-1-0x000007FEF5C40000-0x000007FEF662C000-memory.dmp

          Filesize

          9.9MB

        • memory/2776-0-0x0000000001220000-0x0000000001288000-memory.dmp

          Filesize

          416KB

        • memory/2776-2-0x000000001AFF0000-0x000000001B070000-memory.dmp

          Filesize

          512KB

        • memory/2776-5-0x000007FEF5C40000-0x000007FEF662C000-memory.dmp

          Filesize

          9.9MB

        • memory/2788-411-0x000007FEF5250000-0x000007FEF5C3C000-memory.dmp

          Filesize

          9.9MB

        • memory/2788-412-0x00000000022D0000-0x0000000002350000-memory.dmp

          Filesize

          512KB

        • memory/2788-10-0x00000000002C0000-0x0000000000328000-memory.dmp

          Filesize

          416KB

        • memory/2788-9-0x000007FEF5250000-0x000007FEF5C3C000-memory.dmp

          Filesize

          9.9MB

        • memory/2788-11-0x00000000022D0000-0x0000000002350000-memory.dmp

          Filesize

          512KB