Analysis

  • max time kernel
    23s
  • max time network
    22s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    25-12-2020 08:47

General

  • Target

    1a6760ebbff9dfbd8cff877a303df66a.exe

  • Size

    689KB

  • MD5

    1a6760ebbff9dfbd8cff877a303df66a

  • SHA1

    e66d7e55d74548dea55aeeb0eed3284a8a1c1a28

  • SHA256

    96bbdcb417228948effc7c21ddc3a08addcaa2421dca8870b64ea4f9f691dddd

  • SHA512

    a130b99c5fee0afa3958bbb0972d7a4770d601065e14cd6ea957d34a6d00edffdafd9bf822bf7d1609e79333ffa53e24735cf4a550ee900493f516fbbad2b615

Malware Config

Signatures

  • RedLine

    RedLine Stealer is a malware family written in C#, first appearing in early 2020.

  • RedLine Payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • UPX packed file 2 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Loads dropped DLL 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Checks installed software on the system 1 TTPs

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

  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • 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). Likely ransomware behaviour.

  • Checks processor information in registry 2 TTPs 2 IoCs

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

  • Modifies system certificate store 2 TTPs 3 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 12 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\1a6760ebbff9dfbd8cff877a303df66a.exe
    "C:\Users\Admin\AppData\Local\Temp\1a6760ebbff9dfbd8cff877a303df66a.exe"
    1⤵
    • Loads dropped DLL
    • Checks processor information in registry
    • Suspicious use of WriteProcessMemory
    PID:1204
    • C:\Users\Admin\AppData\Roaming\leadentop\bestof.exe
      bestof.exe
      2⤵
      • Executes dropped EXE
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1580
      • C:\Windows\SysWOW64\cmd.exe
        "cmd.exe" /C ping 127.0.0.1 -n 3 > nul & del ""
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:652
        • C:\Windows\SysWOW64\PING.EXE
          ping 127.0.0.1 -n 3
          4⤵
          • Runs ping.exe
          PID:1600

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Roaming\leadentop\bestof.exe

    MD5

    a7e9e9cf220846cf4886665f5dca877d

    SHA1

    25316dff51b674a33b4db6aa4187477f1bcfb72f

    SHA256

    f8c01a2d1b187aee1a6b8fc7cb87369cbc920e6c288f53af356287cb3def107e

    SHA512

    b2922db7d114e27eda9d436bcd7bb7c29791fbee25a5807223dd9fc0f6b913b0caacbd0518ce97494f42a8bc2f44b0f33ec1cfb0144b41249589f64b23f266db

  • \Users\Admin\AppData\Roaming\leadentop\bestof.exe

    MD5

    a7e9e9cf220846cf4886665f5dca877d

    SHA1

    25316dff51b674a33b4db6aa4187477f1bcfb72f

    SHA256

    f8c01a2d1b187aee1a6b8fc7cb87369cbc920e6c288f53af356287cb3def107e

    SHA512

    b2922db7d114e27eda9d436bcd7bb7c29791fbee25a5807223dd9fc0f6b913b0caacbd0518ce97494f42a8bc2f44b0f33ec1cfb0144b41249589f64b23f266db

  • memory/652-14-0x0000000000000000-mapping.dmp

  • memory/1204-2-0x0000000005369000-0x000000000536A000-memory.dmp

    Filesize

    4KB

  • memory/1204-3-0x0000000005450000-0x0000000005461000-memory.dmp

    Filesize

    68KB

  • memory/1528-4-0x000007FEF7510000-0x000007FEF778A000-memory.dmp

    Filesize

    2.5MB

  • memory/1580-8-0x0000000005309000-0x000000000530A000-memory.dmp

    Filesize

    4KB

  • memory/1580-9-0x00000000055E0000-0x00000000055F1000-memory.dmp

    Filesize

    68KB

  • memory/1580-10-0x0000000006C50000-0x0000000006C61000-memory.dmp

    Filesize

    68KB

  • memory/1580-11-0x0000000073C80000-0x000000007436E000-memory.dmp

    Filesize

    6.9MB

  • memory/1580-12-0x0000000006EA0000-0x0000000006EC4000-memory.dmp

    Filesize

    144KB

  • memory/1580-13-0x0000000009450000-0x0000000009472000-memory.dmp

    Filesize

    136KB

  • memory/1580-6-0x0000000000000000-mapping.dmp

  • memory/1600-15-0x0000000000000000-mapping.dmp