Analysis

  • max time kernel
    129s
  • max time network
    204s
  • platform
    windows7_x64
  • resource
    win7v20210408
  • submitted
    28-07-2021 08:37

General

  • Target

    Invoice NeededPDF.exe

  • Size

    1.1MB

  • MD5

    9cf504947d9ba331fb5d7dab266ded76

  • SHA1

    fbbdd9841da2b426c61db1772da07e9642a75f10

  • SHA256

    edb5f7136ced51208b8c6503f67f9b9153c4ac47a4876b32d82e69208de51509

  • SHA512

    d9f1d86a36d3ed9b6131036c3fac03ec3dc5dd0fb9c5bb255ba04adaf98297092071f83390d42a6e7b3c7ac81ee8f570f1aa4fbaf998829db57d29ed16abb7f9

Malware Config

Extracted

Family

nanocore

Version

1.2.2.0

C2

sys2021.linkpc.net:11940

23.94.82.41:11940

Mutex

de7e01ad-963b-4e14-81aa-08dfb351f0fe

Attributes
  • activate_away_mode

    false

  • backup_connection_host

    23.94.82.41

  • backup_dns_server

    8.8.4.4

  • buffer_size

    65535

  • build_time

    2021-04-24T08:14:59.254967636Z

  • bypass_user_account_control

    true

  • bypass_user_account_control_data

  • clear_access_control

    true

  • clear_zone_identifier

    false

  • connect_delay

    4000

  • connection_port

    11940

  • default_group

    Do

  • 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

    de7e01ad-963b-4e14-81aa-08dfb351f0fe

  • mutex_timeout

    5000

  • prevent_system_sleep

    false

  • primary_connection_host

    sys2021.linkpc.net

  • primary_dns_server

    8.8.8.8

  • request_elevation

    true

  • restart_delay

    5000

  • run_delay

    0

  • run_on_startup

    false

  • set_critical_process

    true

  • timeout_interval

    5000

  • use_custom_dns_server

    false

  • version

    1.2.2.0

  • wan_timeout

    8000

Signatures

  • AgentTesla

    Agent Tesla is a remote access tool (RAT) written in visual basic.

  • Modifies WinLogon for persistence 2 TTPs 2 IoCs
  • NanoCore

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

  • suricata: ET MALWARE Possible NanoCore C2 60B
  • AgentTesla Payload 1 IoCs
  • Executes dropped EXE 2 IoCs
  • 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 2 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.

  • Suspicious behavior: EnumeratesProcesses 14 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of WriteProcessMemory 34 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Invoice NeededPDF.exe
    "C:\Users\Admin\AppData\Local\Temp\Invoice NeededPDF.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:528
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\_Novhflphhvqnbvv.vbs"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1852
      • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Set-MpPreference -ExclusionPath C:\,'C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\ChromesOffice\Officechrome.exe'
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1832
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\Novhflphhvqnbvv.vbs"
      2⤵
      • Loads dropped DLL
      • Suspicious use of WriteProcessMemory
      PID:768
      • C:\Users\Admin\AppData\Local\Temp\Wxyjiizwdkrdwemkrfkmfjet 1.exe
        "C:\Users\Admin\AppData\Local\Temp\Wxyjiizwdkrdwemkrfkmfjet 1.exe"
        3⤵
        • Modifies WinLogon for persistence
        • Executes dropped EXE
        • Loads dropped DLL
        • Suspicious use of SetThreadContext
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1984
        • C:\Users\Admin\AppData\Local\Temp\Wxyjiizwdkrdwemkrfkmfjet 1.exe
          "C:\Users\Admin\AppData\Local\Temp\Wxyjiizwdkrdwemkrfkmfjet 1.exe"
          4⤵
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:1112
    • C:\Users\Admin\AppData\Local\Temp\Invoice NeededPDF.exe
      "C:\Users\Admin\AppData\Local\Temp\Invoice NeededPDF.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
      PID:436

Network

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Winlogon Helper DLL

1
T1004

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Modify Registry

2
T1112

Discovery

System Information Discovery

2
T1082

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\Novhflphhvqnbvv.vbs
    MD5

    c15eedf22134f5b6f0cad431a12a1282

    SHA1

    d72885f0f04d2d3bd88e91d958a959c0f304f5ef

    SHA256

    679b60e67c4e5d6d3817259f795770569982134faf32327ad0e22bc8aa9d1686

    SHA512

    2e4948c4d93b00cf2605d0c2d3946017b2bec64d72c0f685e94e5f9400c139bf0f1650618059e50c7baaef0ad4f1ac00914edb6b07769cf3889af8e33bc136fe

  • C:\Users\Admin\AppData\Local\Temp\Wxyjiizwdkrdwemkrfkmfjet 1.exe
    MD5

    1f8a28e9eea19313c1d5453a4b292788

    SHA1

    51e8b4e4f328bd95d05a783bc953d720d10ea3d1

    SHA256

    f465787fcece594aab905f5b32772c2125fbaebc2dd0c27ab1117e2056648e0f

    SHA512

    a455fcd1a516cde545bbd0e23651188c955f92673ccdb1106ea8c862f454af089746e7fc7712808ada591a2f575400b753caca018c82b956b20cef17850483a0

  • C:\Users\Admin\AppData\Local\Temp\Wxyjiizwdkrdwemkrfkmfjet 1.exe
    MD5

    1f8a28e9eea19313c1d5453a4b292788

    SHA1

    51e8b4e4f328bd95d05a783bc953d720d10ea3d1

    SHA256

    f465787fcece594aab905f5b32772c2125fbaebc2dd0c27ab1117e2056648e0f

    SHA512

    a455fcd1a516cde545bbd0e23651188c955f92673ccdb1106ea8c862f454af089746e7fc7712808ada591a2f575400b753caca018c82b956b20cef17850483a0

  • C:\Users\Admin\AppData\Local\Temp\Wxyjiizwdkrdwemkrfkmfjet 1.exe
    MD5

    1f8a28e9eea19313c1d5453a4b292788

    SHA1

    51e8b4e4f328bd95d05a783bc953d720d10ea3d1

    SHA256

    f465787fcece594aab905f5b32772c2125fbaebc2dd0c27ab1117e2056648e0f

    SHA512

    a455fcd1a516cde545bbd0e23651188c955f92673ccdb1106ea8c862f454af089746e7fc7712808ada591a2f575400b753caca018c82b956b20cef17850483a0

  • C:\Users\Admin\AppData\Local\Temp\_Novhflphhvqnbvv.vbs
    MD5

    28fee73529e257b17f310cb2e1fa7076

    SHA1

    983a7ef04b31b721cd2a7f99233d3c0cafd75c1b

    SHA256

    3bacaf52f5d3cc7e501036ad54c250adebe5c28e6511c55aa4931a8de86da8c1

    SHA512

    e8859192760637ec03de3ccd0ffd62823a2fd9c68c9cce1ce5cb6ddb74bc19d5b1531832a6cfbbdd1d6281a538b7522f37c1e89efb8badac121c71842f16eab8

  • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\ChromesOffice\Officechrome.exe
    MD5

    dc147a3a23a53f94c923bc99405664f3

    SHA1

    67ed419e937389b925254b077b4fac772b3a6942

    SHA256

    d7a00c340a92a15dc18f18dc19409c4af1c44564c35b87895b6340d00dbde64d

    SHA512

    24c3e602df8d062f5850e29c25f69ff7294d9890ccc360d87f96a62c10fc67a9dfcebc4b99cb656b1f607c909bda5d75e22befbbd06d5666f660f106a4f87639

  • \Users\Admin\AppData\Local\Temp\Wxyjiizwdkrdwemkrfkmfjet 1.exe
    MD5

    1f8a28e9eea19313c1d5453a4b292788

    SHA1

    51e8b4e4f328bd95d05a783bc953d720d10ea3d1

    SHA256

    f465787fcece594aab905f5b32772c2125fbaebc2dd0c27ab1117e2056648e0f

    SHA512

    a455fcd1a516cde545bbd0e23651188c955f92673ccdb1106ea8c862f454af089746e7fc7712808ada591a2f575400b753caca018c82b956b20cef17850483a0

  • \Users\Admin\AppData\Local\Temp\Wxyjiizwdkrdwemkrfkmfjet 1.exe
    MD5

    1f8a28e9eea19313c1d5453a4b292788

    SHA1

    51e8b4e4f328bd95d05a783bc953d720d10ea3d1

    SHA256

    f465787fcece594aab905f5b32772c2125fbaebc2dd0c27ab1117e2056648e0f

    SHA512

    a455fcd1a516cde545bbd0e23651188c955f92673ccdb1106ea8c862f454af089746e7fc7712808ada591a2f575400b753caca018c82b956b20cef17850483a0

  • memory/436-107-0x0000000000F10000-0x0000000000F1A000-memory.dmp
    Filesize

    40KB

  • memory/436-99-0x0000000000C60000-0x0000000000C75000-memory.dmp
    Filesize

    84KB

  • memory/436-109-0x0000000001030000-0x000000000103F000-memory.dmp
    Filesize

    60KB

  • memory/436-76-0x0000000000400000-0x0000000000438000-memory.dmp
    Filesize

    224KB

  • memory/436-77-0x000000000041E792-mapping.dmp
  • memory/436-106-0x0000000000EC0000-0x0000000000ECF000-memory.dmp
    Filesize

    60KB

  • memory/436-108-0x0000000001080000-0x00000000010A9000-memory.dmp
    Filesize

    164KB

  • memory/436-78-0x0000000000400000-0x0000000000438000-memory.dmp
    Filesize

    224KB

  • memory/436-105-0x0000000000EB0000-0x0000000000EB9000-memory.dmp
    Filesize

    36KB

  • memory/436-104-0x0000000000E60000-0x0000000000E6D000-memory.dmp
    Filesize

    52KB

  • memory/436-102-0x0000000000CE0000-0x0000000000CE6000-memory.dmp
    Filesize

    24KB

  • memory/436-87-0x0000000000340000-0x0000000000345000-memory.dmp
    Filesize

    20KB

  • memory/436-88-0x0000000000360000-0x0000000000379000-memory.dmp
    Filesize

    100KB

  • memory/436-89-0x0000000000350000-0x0000000000353000-memory.dmp
    Filesize

    12KB

  • memory/436-103-0x0000000000CF0000-0x0000000000CF7000-memory.dmp
    Filesize

    28KB

  • memory/436-101-0x0000000000C80000-0x0000000000C8C000-memory.dmp
    Filesize

    48KB

  • memory/436-92-0x0000000004EE0000-0x0000000004EE1000-memory.dmp
    Filesize

    4KB

  • memory/436-100-0x0000000000B00000-0x0000000000B06000-memory.dmp
    Filesize

    24KB

  • memory/436-98-0x00000000005B0000-0x00000000005BD000-memory.dmp
    Filesize

    52KB

  • memory/528-68-0x0000000000E15000-0x0000000000E26000-memory.dmp
    Filesize

    68KB

  • memory/528-61-0x0000000000E10000-0x0000000000E11000-memory.dmp
    Filesize

    4KB

  • memory/528-62-0x0000000005A30000-0x0000000005AF8000-memory.dmp
    Filesize

    800KB

  • memory/528-67-0x0000000005E40000-0x0000000005F19000-memory.dmp
    Filesize

    868KB

  • memory/528-59-0x0000000001260000-0x0000000001261000-memory.dmp
    Filesize

    4KB

  • memory/768-71-0x0000000000000000-mapping.dmp
  • memory/1112-157-0x0000000004B90000-0x0000000004B91000-memory.dmp
    Filesize

    4KB

  • memory/1112-153-0x0000000000437B0E-mapping.dmp
  • memory/1832-91-0x0000000004980000-0x0000000004981000-memory.dmp
    Filesize

    4KB

  • memory/1832-94-0x0000000004940000-0x0000000004941000-memory.dmp
    Filesize

    4KB

  • memory/1832-85-0x0000000000000000-mapping.dmp
  • memory/1832-96-0x0000000002640000-0x0000000002641000-memory.dmp
    Filesize

    4KB

  • memory/1832-90-0x0000000001ED0000-0x0000000001ED1000-memory.dmp
    Filesize

    4KB

  • memory/1832-97-0x0000000004910000-0x0000000004911000-memory.dmp
    Filesize

    4KB

  • memory/1832-95-0x0000000004942000-0x0000000004943000-memory.dmp
    Filesize

    4KB

  • memory/1832-112-0x0000000005700000-0x0000000005701000-memory.dmp
    Filesize

    4KB

  • memory/1832-117-0x0000000005740000-0x0000000005741000-memory.dmp
    Filesize

    4KB

  • memory/1832-118-0x00000000061F0000-0x00000000061F1000-memory.dmp
    Filesize

    4KB

  • memory/1832-125-0x0000000006280000-0x0000000006281000-memory.dmp
    Filesize

    4KB

  • memory/1832-126-0x000000007EF30000-0x000000007EF31000-memory.dmp
    Filesize

    4KB

  • memory/1832-127-0x0000000005620000-0x0000000005621000-memory.dmp
    Filesize

    4KB

  • memory/1852-69-0x0000000000000000-mapping.dmp
  • memory/1852-72-0x0000000075FF1000-0x0000000075FF3000-memory.dmp
    Filesize

    8KB

  • memory/1984-93-0x0000000004D50000-0x0000000004D51000-memory.dmp
    Filesize

    4KB

  • memory/1984-149-0x0000000004D55000-0x0000000004D66000-memory.dmp
    Filesize

    68KB

  • memory/1984-83-0x00000000012A0000-0x00000000012A1000-memory.dmp
    Filesize

    4KB

  • memory/1984-81-0x0000000000000000-mapping.dmp