Analysis

  • max time kernel
    135s
  • max time network
    137s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    01-11-2020 07:01

General

  • Target

    cb4255d73d0fd4ce9a13464ddae05d54.exe

  • Size

    781KB

  • MD5

    cb4255d73d0fd4ce9a13464ddae05d54

  • SHA1

    75c531c0bf974395be88ea678b95561de4e8966d

  • SHA256

    7b6c0334b1cc26e87e6a071ed278dd0781634460e0de56245fc306624340fb21

  • SHA512

    63b885330de0e8a07919a267b751cab364c302a35d093ca73a42ca4599365675a7cdb4278134b7bb10fe2dc72d039ad3704e7bc0eca8ac9db93ed7ee0dd56ed4

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
  • 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 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). 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 2 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\cb4255d73d0fd4ce9a13464ddae05d54.exe
    "C:\Users\Admin\AppData\Local\Temp\cb4255d73d0fd4ce9a13464ddae05d54.exe"
    1⤵
    • Loads dropped DLL
    • Checks processor information in registry
    • Modifies system certificate store
    • Suspicious use of WriteProcessMemory
    PID:300
    • C:\Users\Admin\AppData\Roaming\gfersesurity\bestof.exe
      bestof.exe
      2⤵
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1380
      • C:\Windows\SysWOW64\cmd.exe
        "cmd.exe" /C ping 127.0.0.1 -n 3 > nul & del ""
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1476
        • C:\Windows\SysWOW64\PING.EXE
          ping 127.0.0.1 -n 3
          4⤵
          • Runs ping.exe
          PID:1056

Network

MITRE ATT&CK Matrix ATT&CK v6

Defense Evasion

Install Root Certificate

1
T1130

Modify Registry

1
T1112

Credential Access

Credentials in Files

1
T1081

Discovery

Query Registry

2
T1012

System Information Discovery

2
T1082

Remote System Discovery

1
T1018

Collection

Data from Local System

1
T1005

Command and Control

Web Service

1
T1102

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Roaming\gfersesurity\bestof.exe
    MD5

    6943b3380427465a7998ddf3a96945a0

    SHA1

    abb680ef5e005da1610828d518c15a250b001fd9

    SHA256

    94e489927f1f04b50d80382b4ebbb245d8b0cd55f36dac8d7de3c543cbf361fb

    SHA512

    5c8fb35986df56b3f6f7b850a98455ab3d767372b57838d54c9faf280826975a0f2a0828fa977469a3d5e02ce9f7bea23e8b574cf793f4264f385e871de8277d

  • \Users\Admin\AppData\Roaming\gfersesurity\bestof.exe
    MD5

    6943b3380427465a7998ddf3a96945a0

    SHA1

    abb680ef5e005da1610828d518c15a250b001fd9

    SHA256

    94e489927f1f04b50d80382b4ebbb245d8b0cd55f36dac8d7de3c543cbf361fb

    SHA512

    5c8fb35986df56b3f6f7b850a98455ab3d767372b57838d54c9faf280826975a0f2a0828fa977469a3d5e02ce9f7bea23e8b574cf793f4264f385e871de8277d

  • memory/300-1-0x0000000003D50000-0x0000000003D61000-memory.dmp
    Filesize

    68KB

  • memory/1056-14-0x0000000000000000-mapping.dmp
  • memory/1288-2-0x000007FEF7D40000-0x000007FEF7FBA000-memory.dmp
    Filesize

    2.5MB

  • memory/1380-7-0x0000000003C30000-0x0000000003C41000-memory.dmp
    Filesize

    68KB

  • memory/1380-6-0x00000000002C9000-0x00000000002CA000-memory.dmp
    Filesize

    4KB

  • memory/1380-8-0x0000000003F70000-0x0000000003F81000-memory.dmp
    Filesize

    68KB

  • memory/1380-9-0x0000000074520000-0x0000000074C0E000-memory.dmp
    Filesize

    6.9MB

  • memory/1380-10-0x0000000003E70000-0x0000000003E94000-memory.dmp
    Filesize

    144KB

  • memory/1380-11-0x0000000003F00000-0x0000000003F22000-memory.dmp
    Filesize

    136KB

  • memory/1380-4-0x0000000000000000-mapping.dmp
  • memory/1476-12-0x0000000000000000-mapping.dmp