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Analysis

  • max time kernel
    144s
  • max time network
    139s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    21/09/2024, 23:55

General

  • Target

    Rekt/Rekt/UpdaterBypass.exe

  • Size

    272KB

  • MD5

    466b0d1009bfef71e27740092bc4c286

  • SHA1

    66754e3aaf8128a790f9ddebf9f6830fc0db24cd

  • SHA256

    0af94596f1f3bfb0b3b1d61bf7bedf28347254e5e5e1e8a07110f26e07f8b3cc

  • SHA512

    86ec2fe6ac85a83572753ddb0ed93bdfe1e81b3c955476b3e9a54345b1cc3ab1c3f86f18a61cc7e6ecb8774e07b69f7dcf754afb5e8e23ad17409cde529258d2

  • SSDEEP

    6144:iMhANGQqRGT1HPRPAeZID3ziZSzlGYnC939:hhANyg1HdAeZIviZSzlG6

Malware Config

Extracted

Family

nanocore

Version

1.2.2.0

C2

XeKush32.chickenkiller.com:63072

127.0.0.1:63072

Mutex

9a386a9b-a46f-49c4-91d6-d82c1b252ecb

Attributes
  • activate_away_mode

    true

  • backup_connection_host

    127.0.0.1

  • backup_dns_server

    8.8.4.4

  • buffer_size

    65535

  • build_time

    2015-04-05T08:02:20.893902836Z

  • bypass_user_account_control

    true

  • bypass_user_account_control_data

  • clear_access_control

    true

  • clear_zone_identifier

    false

  • connect_delay

    4000

  • connection_port

    63072

  • default_group

    Default

  • enable_debug_mode

    true

  • gc_threshold

    1.048576e+07

  • keep_alive_timeout

    30000

  • keyboard_logging

    false

  • lan_timeout

    2500

  • max_packet_size

    1.048576e+07

  • mutex

    9a386a9b-a46f-49c4-91d6-d82c1b252ecb

  • mutex_timeout

    5000

  • prevent_system_sleep

    false

  • primary_connection_host

    XeKush32.chickenkiller.com

  • primary_dns_server

    8.8.8.8

  • request_elevation

    true

  • restart_delay

    5000

  • run_delay

    0

  • run_on_startup

    true

  • set_critical_process

    true

  • timeout_interval

    5000

  • use_custom_dns_server

    false

  • version

    1.2.2.0

  • wan_timeout

    8000

Signatures

  • NanoCore

    NanoCore is a remote access tool (RAT) with a variety of capabilities.

  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Checks whether UAC is enabled 1 TTPs 1 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • System Location Discovery: System Language Discovery 1 TTPs 6 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

    Adversaries may check for Internet connectivity on compromised systems.

  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 3 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 20 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Rekt\Rekt\UpdaterBypass.exe
    "C:\Users\Admin\AppData\Local\Temp\Rekt\Rekt\UpdaterBypass.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2272
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c PING 127.0.0.1 -n 10 > nul
      2⤵
      • System Location Discovery: System Language Discovery
      • System Network Configuration Discovery: Internet Connection Discovery
      • Suspicious use of WriteProcessMemory
      PID:4544
      • C:\Windows\SysWOW64\PING.EXE
        PING 127.0.0.1 -n 10
        3⤵
        • System Location Discovery: System Language Discovery
        • System Network Configuration Discovery: Internet Connection Discovery
        • Runs ping.exe
        PID:3364
    • C:\Users\Admin\AppData\Local\Temp\Rekt\Rekt\UpdaterBypass.exe
      "C:\Users\Admin\AppData\Local\Temp\Rekt\Rekt\UpdaterBypass.exe"
      2⤵
      • Checks whether UAC is enabled
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      PID:4632
    • C:\Windows\Microsoft.NET\Framework\v2.0.50727\csc.exe
      "C:\Windows\Microsoft.NET\Framework\v2.0.50727\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\y7ezfuvs.cmdline"
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1488
    • C:\Windows\Microsoft.NET\Framework\v2.0.50727\csc.exe
      "C:\Windows\Microsoft.NET\Framework\v2.0.50727\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\zrnjsebg.cmdline"
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3272

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • \??\c:\Users\Admin\AppData\Local\Temp\y7ezfuvs.0.cs

    Filesize

    221B

    MD5

    1970d18f40cb77845e57803988ff5709

    SHA1

    9267ebd3ba029c74dd13d3fb28121de5012b09a2

    SHA256

    30d7b6904297e19bc0e668425754632c4f774b1d9e24fdcb18a98f7497ca826f

    SHA512

    30c13ca64c09acc354c96277f7e835fa7f4cfc7534caef04389f79eb5bf94c81a87fc7037b642ec8cee778b3d25e90fb8e05630befbfbb09f229a731fca93bf2

  • \??\c:\Users\Admin\AppData\Local\Temp\y7ezfuvs.cmdline

    Filesize

    258B

    MD5

    72663f3277fbac5a9662db5eb2d39aff

    SHA1

    e6f9fb579a79678fa187d76e0f606b8f6f8865ba

    SHA256

    dfd14a792c1c87a839c40716dcda53d7f18c8dda2a70daa3a4efa3f27cef1342

    SHA512

    a7f1fbc749ad2a125014e3f9dfd4638bfbeac32eafc46d31df8832c528eb9e683a1484246151fb6b89d7b08264937337298f2a599b922520523104f1c69d3523

  • \??\c:\Users\Admin\AppData\Local\Temp\zrnjsebg.0.cs

    Filesize

    222B

    MD5

    b2a3c1b910d9ad1d13e42acb2655366f

    SHA1

    9f05dfd1ea70f5913d88fa6e94a1a8db163434d8

    SHA256

    232b51f0a7d5cdacb9208dec5773200142c252d57f2293bb62faaa456a6583e2

    SHA512

    a9b5ab24e066ab0169262811ca005943a1bd0655368352f14afbb912a6086067e6c34dbc6e11fc0f54d593d9ebc5900d01f2d21713ac0806b40b9d7de899c289

  • \??\c:\Users\Admin\AppData\Local\Temp\zrnjsebg.cmdline

    Filesize

    217B

    MD5

    4ef523c0a484a2d4a0d4f1d603938115

    SHA1

    6058b9b9115a9147c5ff31a0ec71e23990e4f2a7

    SHA256

    371ebc9aa34f173ca00ba92562d74569a656d95959f88a0f8ef7ab38b92c4183

    SHA512

    a402bd066d875ba867c68463156004da7aeabb56f72aa2c0f504d41cdfdaa9c494eb18ccbd4ac7fb6c26cd0ca273730283699a9efac939c1d781ff7b10f6dd7a

  • memory/2272-4-0x0000000075472000-0x0000000075473000-memory.dmp

    Filesize

    4KB

  • memory/2272-5-0x0000000075470000-0x0000000075A21000-memory.dmp

    Filesize

    5.7MB

  • memory/2272-0-0x0000000075472000-0x0000000075473000-memory.dmp

    Filesize

    4KB

  • memory/2272-3-0x0000000075470000-0x0000000075A21000-memory.dmp

    Filesize

    5.7MB

  • memory/2272-2-0x0000000075470000-0x0000000075A21000-memory.dmp

    Filesize

    5.7MB

  • memory/2272-1-0x0000000075470000-0x0000000075A21000-memory.dmp

    Filesize

    5.7MB

  • memory/2272-26-0x0000000075470000-0x0000000075A21000-memory.dmp

    Filesize

    5.7MB

  • memory/4632-8-0x0000000000400000-0x0000000000438000-memory.dmp

    Filesize

    224KB

  • memory/4632-10-0x0000000075470000-0x0000000075A21000-memory.dmp

    Filesize

    5.7MB

  • memory/4632-11-0x0000000075470000-0x0000000075A21000-memory.dmp

    Filesize

    5.7MB

  • memory/4632-12-0x0000000075470000-0x0000000075A21000-memory.dmp

    Filesize

    5.7MB

  • memory/4632-27-0x0000000075470000-0x0000000075A21000-memory.dmp

    Filesize

    5.7MB