Analysis

  • max time kernel
    136s
  • max time network
    166s
  • platform
    windows7_x64
  • resource
    win7-20231215-en
  • resource tags

    arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
  • submitted
    27/12/2023, 14:21

General

  • Target
    b2ecd207b38890a16653912d8003844c.dll
  • Size 426KB
  • Sample231227-rn9ezaffc8
  • SHA256 fadb58b40ce2cbf2af1ded0c0b3c91354b761796ef8d9d8d48a4e64e4a543dba
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • Bazar Loader

    Detected loader normally used to deploy BazarBackdoor malware.

  • Bazar/Team9 Loader payload 2 IoCs
  • Blocklisted process makes network request 22 IoCs
  • Tries to connect to .bazar domain 8 IoCs

    Attempts to lookup or connect to a .bazar domain, used by BazarBackdoor, Trickbot, and potentially others.

  • Unexpected DNS network traffic destination 8 IoCs

    Network traffic to other servers than the configured DNS servers was detected on the DNS port.

  • Looks up external IP address via web service 2 IoCs

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

  • Modifies system certificate store 2 TTPs 6 IoCs

Processes

  • C:\Windows\system32\rundll32.exe
    rundll32.exe C:\Users\Admin\AppData\Local\Temp\b2ecd207b38890a16653912d8003844c.dll,#1
    1⤵
    • Blocklisted process makes network request
    • Modifies system certificate store
    PID:1252

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        94308059B57B3142E455B38A6EB92015

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
        • Size 344B
        • SHA256 6faed2ea06a9f68f21dc338f288c834c293732a3cb72d4e802f4e4ef0993a5e5
        • MD5 SHA1 SHA512

        Cab735E.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\Cab735E.tmp
        • Size 65KB
        • SHA256 c6456e12e5e53287a547af4103e0397cb9697e466cf75844312dc296d43d144d
        • MD5 SHA1 SHA512 SSDEEP

        Tar7776.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\Tar7776.tmp
        • Size 171KB
        • SHA256 4276af3669a141a59388bc56a87f6614d9a9bdddf560636c264219a7eb11256f
        • MD5 SHA1 SHA512 SSDEEP

        memory/1252-0-0x0000000001DD0000-0x0000000002059000-memory.dmp

        memory/1252-1-0x0000000001DD0000-0x0000000002059000-memory.dmp