Resubmissions

01-11-2020 19:46

201101-wasyw1mata 10

01-11-2020 18:42

201101-nz6el7j116 10

Analysis

  • max time kernel
    28s
  • max time network
    28s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    01-11-2020 18:42

General

  • Target

    71c391018799e159e37eabeaacb0b949.exe

  • Size

    668KB

  • MD5

    71c391018799e159e37eabeaacb0b949

  • SHA1

    8f318b2335b60f989a50826fbf12068b20b47ac7

  • SHA256

    970c48c21582ed3e4cd22dded1852da31a0b83bfe93c0d82c74445928d104e7f

  • SHA512

    ef1b9ce4c89e86e6641856c12671e0bae29bed364b0df1065d80c322f1a5ec9a473606a38289b83079395632e00581a69388b5f8665509da092cb8fe55330ff3

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\71c391018799e159e37eabeaacb0b949.exe
    "C:\Users\Admin\AppData\Local\Temp\71c391018799e159e37eabeaacb0b949.exe"
    1⤵
    • Loads dropped DLL
    • Checks processor information in registry
    • Modifies system certificate store
    • Suspicious use of WriteProcessMemory
    PID:1924
    • 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:1932
      • C:\Windows\SysWOW64\cmd.exe
        "cmd.exe" /C ping 127.0.0.1 -n 3 > nul & del ""
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1820
        • C:\Windows\SysWOW64\PING.EXE
          ping 127.0.0.1 -n 3
          4⤵
          • Runs ping.exe
          PID:1780

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads

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

    MD5

    72131adb0e2315281aae445db11e09a2

    SHA1

    712ca2ebaa7d9bc9bbe18f7843954cfb0d22b08e

    SHA256

    9ea7a66f0c3dc13ddfc6f05d95049dd7f641053a380578a12013db9f72367f65

    SHA512

    bbc68fa0c586aaa7227da59848407672e7629e8f1289384add8638c21bab69d41495bcfc7881446b527e5aa4db14e1babc4f71dfee32b69705e6d3b64bf46a22

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

    MD5

    72131adb0e2315281aae445db11e09a2

    SHA1

    712ca2ebaa7d9bc9bbe18f7843954cfb0d22b08e

    SHA256

    9ea7a66f0c3dc13ddfc6f05d95049dd7f641053a380578a12013db9f72367f65

    SHA512

    bbc68fa0c586aaa7227da59848407672e7629e8f1289384add8638c21bab69d41495bcfc7881446b527e5aa4db14e1babc4f71dfee32b69705e6d3b64bf46a22

  • memory/744-2-0x000007FEF76B0000-0x000007FEF792A000-memory.dmp

    Filesize

    2.5MB

  • memory/1780-19-0x0000000000000000-mapping.dmp

  • memory/1820-17-0x0000000000000000-mapping.dmp

  • memory/1924-1-0x0000000003EA0000-0x0000000003EB1000-memory.dmp

    Filesize

    68KB

  • memory/1924-0-0x00000000027D9000-0x00000000027DA000-memory.dmp

    Filesize

    4KB

  • memory/1932-6-0x00000000023F9000-0x00000000023FA000-memory.dmp

    Filesize

    4KB

  • memory/1932-8-0x0000000003F30000-0x0000000003F41000-memory.dmp

    Filesize

    68KB

  • memory/1932-9-0x0000000073D10000-0x00000000743FE000-memory.dmp

    Filesize

    6.9MB

  • memory/1932-10-0x00000000023A0000-0x00000000023C4000-memory.dmp

    Filesize

    144KB

  • memory/1932-16-0x0000000003ED0000-0x0000000003EF2000-memory.dmp

    Filesize

    136KB

  • memory/1932-7-0x0000000003D80000-0x0000000003D91000-memory.dmp

    Filesize

    68KB

  • memory/1932-4-0x0000000000000000-mapping.dmp