Analysis

  • max time kernel
    117s
  • max time network
    123s
  • platform
    windows7_x64
  • resource
    win7-20230831-en
  • resource tags

    arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
  • submitted
    08-09-2023 09:48

General

  • Target

    369204590CE91E77109E21A298753522.exe

  • Size

    119KB

  • MD5

    369204590ce91e77109e21a298753522

  • SHA1

    e981f0c86c42e9e8fcbc7dcff0e05c35887a3869

  • SHA256

    a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647

  • SHA512

    bf4367a692eb1f4c31533ee1391cfc1708c75bf726dd5287ac0fa2e602664fa3a74458ded18c1831db16f0462b202f79b10d0f82f3bcb98423a460002e04cf32

  • SSDEEP

    3072:P56Q4BB1q/hJcq4YZRKsySYSLLx9yLjj6TG6WVt9bm+EFyW43LORzMJS/3:Fha6BuQdwLKTGLt9bmhD4q1Mc

Malware Config

Signatures

  • Detect Gurcu Stealer V3 payload 7 IoCs
  • Gurcu, WhiteSnake

    Gurcu is a malware stealer written in C#.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 2 IoCs
  • 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 1 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).

  • Program crash 2 IoCs
  • 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 6 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 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\369204590CE91E77109E21A298753522.exe
    "C:\Users\Admin\AppData\Local\Temp\369204590CE91E77109E21A298753522.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2300
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "369204590CE91E77109E21A298753522" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\369204590CE91E77109E21A298753522.exe" &&START "" "C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:1376
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2616
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2688
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "369204590CE91E77109E21A298753522" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2596
        • C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe
          "C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe"
          3⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Modifies system certificate store
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2724
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2724 -s 2868
            4⤵
            • Program crash
            PID:2268
    • C:\Windows\system32\taskeng.exe
      taskeng.exe {0516550A-1641-4A9B-82AA-D1C8A7E5B693} S-1-5-21-3185155662-718608226-894467740-1000:YETUIZPU\Admin:Interactive:[1]
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:1080
      • C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe
        C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe
        2⤵
        • Executes dropped EXE
        • Accesses Microsoft Outlook profiles
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        • outlook_office_path
        • outlook_win_path
        PID:564
        • C:\Windows\system32\WerFault.exe
          C:\Windows\system32\WerFault.exe -u -p 564 -s 2952
          3⤵
          • Program crash
          PID:2156

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

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

      Filesize

      344B

      MD5

      e8c2307c84f29f371ed8369fe7a0ebd6

      SHA1

      44f1ff2f7f865a21d4b742a65644ac562a288f01

      SHA256

      4ddd066007e4f287250340425b71ac9ef4c50eb8a222a785429a7b98fd8e6fba

      SHA512

      104851eaf146457546f7494111d9441f0775899f147902f6379b810cc02e6fe08d077646af00dac4fd6309ac70c85b9b50da94c50589c84edfbff5e2a0871a02

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

      Filesize

      344B

      MD5

      f03b146b2e78605d53368549e6d94f18

      SHA1

      814f228b5a9880f56dabf2ba5581735aae73b691

      SHA256

      f84ddcac3ba57e6e3fe1cade0bd844ec3511691fab1754067a921ae92c067419

      SHA512

      24c02099beaf7965ed03ddca461cb2739da9cdac31ad4011aea777de5a94c6bbd925cc9cdb03435c3b77190935722647d532b83c43bdaff2d7032f0ac76ca034

    • C:\Users\Admin\AppData\Local\84tnjh4449\port.dat

      Filesize

      4B

      MD5

      baed9f51d412c2514ee46a0942138ad6

      SHA1

      45936e464b0f4fb92fed14504f9c50a909729e99

      SHA256

      07492b151560912565b471452f8baadbf3bc80c73814708053d9e4fb7e6e1401

      SHA512

      32e44fd6b30ffee03bbd7eab1000f2ab43defbef6b74aba10eaf0788000167883cdcd0eaf14e9fe0d52ab160d687199634ea2fe1d807399f3ac9bfe2ae62af23

    • C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe

      Filesize

      119KB

      MD5

      369204590ce91e77109e21a298753522

      SHA1

      e981f0c86c42e9e8fcbc7dcff0e05c35887a3869

      SHA256

      a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647

      SHA512

      bf4367a692eb1f4c31533ee1391cfc1708c75bf726dd5287ac0fa2e602664fa3a74458ded18c1831db16f0462b202f79b10d0f82f3bcb98423a460002e04cf32

    • C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe

      Filesize

      119KB

      MD5

      369204590ce91e77109e21a298753522

      SHA1

      e981f0c86c42e9e8fcbc7dcff0e05c35887a3869

      SHA256

      a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647

      SHA512

      bf4367a692eb1f4c31533ee1391cfc1708c75bf726dd5287ac0fa2e602664fa3a74458ded18c1831db16f0462b202f79b10d0f82f3bcb98423a460002e04cf32

    • C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe

      Filesize

      119KB

      MD5

      369204590ce91e77109e21a298753522

      SHA1

      e981f0c86c42e9e8fcbc7dcff0e05c35887a3869

      SHA256

      a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647

      SHA512

      bf4367a692eb1f4c31533ee1391cfc1708c75bf726dd5287ac0fa2e602664fa3a74458ded18c1831db16f0462b202f79b10d0f82f3bcb98423a460002e04cf32

    • C:\Users\Admin\AppData\Local\Temp\CabD27E.tmp

      Filesize

      61KB

      MD5

      f3441b8572aae8801c04f3060b550443

      SHA1

      4ef0a35436125d6821831ef36c28ffaf196cda15

      SHA256

      6720349e7d82ee0a8e73920d3c2b7cb2912d9fcf2edb6fd98f2f12820158b0bf

      SHA512

      5ba01ba421b50030e380ae6bbcd2f681f2a91947fe7fedb3c8e6b5f24dce9517abf57b1cf26cc6078d4bb53bde6fcfb2561591337c841f8f2cb121a3d71661b9

    • C:\Users\Admin\AppData\Local\Temp\TarD2C0.tmp

      Filesize

      163KB

      MD5

      9441737383d21192400eca82fda910ec

      SHA1

      725e0d606a4fc9ba44aa8ffde65bed15e65367e4

      SHA256

      bc3a6e84e41faeb57e7c21aa3b60c2a64777107009727c5b7c0ed8fe658909e5

      SHA512

      7608dd653a66cd364392a78d4711b48d1707768d36996e4d38871c6843b5714e1d7da4b4cc6db969e6000cfa182bcb74216ef6823d1063f036fc5c3413fb8dcf

    • C:\Users\Admin\AppData\Local\Temp\installUtilLog.txt

      Filesize

      41B

      MD5

      1dc1f257ec74e0488f5e190eae799941

      SHA1

      93cdcdacd427c6154c12475d5a809495d0d55b3b

      SHA256

      04aa645fad7315470fc6be35f94cf06c65e592f32da763bd140d6bd36d5bc7d3

      SHA512

      5e092057d83adc2299e3553e43cd5191a83969bcb5ed6edf824da9c0d6097d839395119bc4ecb9041c26539e6611c9e31750c3e61f05b67b8a5bc129f6bfbb53

    • memory/564-79-0x000007FEF4D50000-0x000007FEF573C000-memory.dmp

      Filesize

      9.9MB

    • memory/564-103-0x000000001B160000-0x000000001B1E0000-memory.dmp

      Filesize

      512KB

    • memory/564-102-0x000007FEF4D50000-0x000007FEF573C000-memory.dmp

      Filesize

      9.9MB

    • memory/564-80-0x000000001B160000-0x000000001B1E0000-memory.dmp

      Filesize

      512KB

    • memory/2300-2-0x000000001B050000-0x000000001B0D0000-memory.dmp

      Filesize

      512KB

    • memory/2300-5-0x000007FEF5740000-0x000007FEF612C000-memory.dmp

      Filesize

      9.9MB

    • memory/2300-1-0x0000000000E50000-0x0000000000E74000-memory.dmp

      Filesize

      144KB

    • memory/2300-0-0x000007FEF5740000-0x000007FEF612C000-memory.dmp

      Filesize

      9.9MB

    • memory/2724-77-0x000000001B330000-0x000000001B3B0000-memory.dmp

      Filesize

      512KB

    • memory/2724-76-0x000007FEF4D50000-0x000007FEF573C000-memory.dmp

      Filesize

      9.9MB

    • memory/2724-11-0x000000001B330000-0x000000001B3B0000-memory.dmp

      Filesize

      512KB

    • memory/2724-9-0x00000000008D0000-0x00000000008F4000-memory.dmp

      Filesize

      144KB

    • memory/2724-10-0x000007FEF4D50000-0x000007FEF573C000-memory.dmp

      Filesize

      9.9MB