Analysis

  • max time kernel
    148s
  • max time network
    16s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    28-02-2021 07:18

General

  • Target

    4b13202d3051cdb4a77aea1f199b80e923c6071dc064246ae518a4ca57091965.exe

  • Size

    566KB

  • MD5

    f26e9eb5914b78c8f295a4713939d4a9

  • SHA1

    51997a3762efd15608e50abde8a687b17b481cc3

  • SHA256

    4b13202d3051cdb4a77aea1f199b80e923c6071dc064246ae518a4ca57091965

  • SHA512

    e51af7865aa4827fb4d525113a8d73373f3995a13194e21c70f792a68ed23c0f61090164670b68f16649b10fef54a2e3702ebe24810c32efca26e7d40c84dea9

Malware Config

Extracted

Family

nanocore

Version

1.2.2.0

C2

:54984

127.0.0.1:54984

Mutex

49c25f92-88ec-46d9-9a7c-8eb39880ba42

Attributes
  • activate_away_mode

    false

  • backup_connection_host

    127.0.0.1

  • backup_dns_server

    84.200.70.40

  • buffer_size

    65535

  • build_time

    2020-12-07T22:10:51.801964236Z

  • bypass_user_account_control

    false

  • bypass_user_account_control_data

    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

  • clear_access_control

    false

  • clear_zone_identifier

    false

  • connect_delay

    4000

  • connection_port

    54984

  • default_group

    Default

  • enable_debug_mode

    false

  • gc_threshold

    1.048576e+07

  • keep_alive_timeout

    30000

  • keyboard_logging

    false

  • lan_timeout

    2500

  • max_packet_size

    1.048576e+07

  • mutex

    49c25f92-88ec-46d9-9a7c-8eb39880ba42

  • mutex_timeout

    5000

  • prevent_system_sleep

    false

  • primary_connection_host

  • primary_dns_server

    84.200.69.80

  • request_elevation

    false

  • restart_delay

    5000

  • run_delay

    0

  • run_on_startup

    false

  • set_critical_process

    false

  • timeout_interval

    5000

  • use_custom_dns_server

    false

  • version

    1.2.2.0

  • wan_timeout

    7973

Signatures

  • NanoCore

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

  • Loads dropped DLL 2 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Checks whether UAC is enabled 1 TTPs 1 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Drops file in Program Files directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 2 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 7 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious behavior: MapViewOfSection 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 13 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\4b13202d3051cdb4a77aea1f199b80e923c6071dc064246ae518a4ca57091965.exe
    "C:\Users\Admin\AppData\Local\Temp\4b13202d3051cdb4a77aea1f199b80e923c6071dc064246ae518a4ca57091965.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: MapViewOfSection
    • Suspicious use of WriteProcessMemory
    PID:1004
    • C:\Users\Admin\AppData\Local\Temp\4b13202d3051cdb4a77aea1f199b80e923c6071dc064246ae518a4ca57091965.exe
      "C:\Users\Admin\AppData\Local\Temp\4b13202d3051cdb4a77aea1f199b80e923c6071dc064246ae518a4ca57091965.exe"
      2⤵
      • Adds Run key to start application
      • Checks whether UAC is enabled
      • Drops file in Program Files directory
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1368
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks.exe" /create /f /tn "NTFS Manager" /xml "C:\Users\Admin\AppData\Local\Temp\tmp5C53.tmp"
        3⤵
        • Creates scheduled task(s)
        PID:1580
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks.exe" /create /f /tn "NTFS Manager Task" /xml "C:\Users\Admin\AppData\Local\Temp\tmp5E09.tmp"
        3⤵
        • Creates scheduled task(s)
        PID:560

Network

MITRE ATT&CK Matrix ATT&CK v6

Execution

Scheduled Task

1
T1053

Persistence

Registry Run Keys / Startup Folder

1
T1060

Scheduled Task

1
T1053

Privilege Escalation

Scheduled Task

1
T1053

Defense Evasion

Modify Registry

1
T1112

Discovery

System Information Discovery

2
T1082

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\tmp5C53.tmp
    MD5

    42720defdd16ddaf1eefae539842d62a

    SHA1

    9ace2b55a24537fe82b17c4782ecf9a4437f2701

    SHA256

    903da32b8b842bf5c73f34da20626040385d20b52e6c05636126906edb8362e4

    SHA512

    b851874c9a167b6899d00bdabfc79b1b1668ec5f43922d99c775c923c2a0e983536c02b92098da6181148537f7bca4ea0f7097c28aa389f669b8802bbc3cfb3b

  • C:\Users\Admin\AppData\Local\Temp\tmp5E09.tmp
    MD5

    41808f05a9aa523d0ef506d4993f1d6c

    SHA1

    5a228145decf63ebbbd673c9b7c08a86236a22d4

    SHA256

    f76bd5da395a725b5998efab9a5d3160657cf2d44a8be83fa24af6ba29acf731

    SHA512

    7cf71f8fd8dccaa8cf2c724afca3178be8b7a6e0cc6e4b44990e96413bd0dac8248e2bcfa1bb82da05efb6c4b46649722c20ce14cf4a44f1720e18732bd9246e

  • \Users\Admin\AppData\Local\Temp\hcjp9mqi.dll
    MD5

    c207d9eae3465543976410bb2f578c33

    SHA1

    297ab2ee38cba9cb764cb74872155fb15d984ca2

    SHA256

    1fc080f97140182ebaac437235b0ee53a32658bf7b6aed2680cd5c93e5c7c6e3

    SHA512

    a563f62882f75e93d2c69bdf2880d3394686d5286469bb452b4ce54cdf5de4fc57edd9659d033def921091d918ac97c83cd6baa4d9e89e669f4d607f6b85b760

  • \Users\Admin\AppData\Local\Temp\nsc4847.tmp\System.dll
    MD5

    fccff8cb7a1067e23fd2e2b63971a8e1

    SHA1

    30e2a9e137c1223a78a0f7b0bf96a1c361976d91

    SHA256

    6fcea34c8666b06368379c6c402b5321202c11b00889401c743fb96c516c679e

    SHA512

    f4335e84e6f8d70e462a22f1c93d2998673a7616c868177cac3e8784a3be1d7d0bb96f2583fa0ed82f4f2b6b8f5d9b33521c279a42e055d80a94b4f3f1791e0c

  • memory/560-15-0x0000000000000000-mapping.dmp
  • memory/1004-2-0x0000000076451000-0x0000000076453000-memory.dmp
    Filesize

    8KB

  • memory/1368-11-0x0000000004651000-0x0000000004652000-memory.dmp
    Filesize

    4KB

  • memory/1368-12-0x0000000004652000-0x0000000004653000-memory.dmp
    Filesize

    4KB

  • memory/1368-10-0x0000000000400000-0x0000000000449000-memory.dmp
    Filesize

    292KB

  • memory/1368-8-0x0000000000490000-0x00000000004C3000-memory.dmp
    Filesize

    204KB

  • memory/1368-7-0x0000000074B50000-0x000000007523E000-memory.dmp
    Filesize

    6.9MB

  • memory/1368-16-0x0000000004653000-0x0000000004654000-memory.dmp
    Filesize

    4KB

  • memory/1368-17-0x0000000004654000-0x0000000004655000-memory.dmp
    Filesize

    4KB

  • memory/1368-5-0x000000000040188B-mapping.dmp
  • memory/1368-19-0x0000000004640000-0x0000000004645000-memory.dmp
    Filesize

    20KB

  • memory/1368-20-0x0000000004FA0000-0x0000000004FB9000-memory.dmp
    Filesize

    100KB

  • memory/1368-21-0x0000000004C00000-0x0000000004C03000-memory.dmp
    Filesize

    12KB

  • memory/1580-13-0x0000000000000000-mapping.dmp