Analysis

  • max time kernel
    68s
  • max time network
    140s
  • platform
    windows10_x64
  • resource
    win10-20220414-en
  • submitted
    19-04-2022 09:48

General

  • Target

    d5093b4995d9d244ed4f6e6e77879d6290b20034730b17e3ed738eba8ef107a1.exe

  • Size

    762KB

  • MD5

    47d1cc15399a901f6f2d509b6db10565

  • SHA1

    c60ba6490b78c4864bd21ff470132d36dc3c67d1

  • SHA256

    d5093b4995d9d244ed4f6e6e77879d6290b20034730b17e3ed738eba8ef107a1

  • SHA512

    322a3f243d4521e807e168ac67d65f0b2579f9bcb5939e75222df50569814d3fc7f22d88546b972def685cedba0e163ca9460d7bb42a41b1ae36a02aad40493f

Malware Config

Extracted

Family

djvu

C2

http://fuyt.org/fhsgtsspen6/get.php

Attributes
  • extension

    .nuhb

  • offline_id

    PfLhykvDxmCghCq8peuxBtQ3c0QBuANi8WUkuet1

  • payload_url

    http://zerit.top/dl/build2.exe

    http://fuyt.org/files/1/build3.exe

  • ransomnote

    ATTENTION! Don't worry, you can return all your files! All your files like pictures, databases, documents and other important are encrypted with strongest encryption and unique key. The only method of recovering files is to purchase decrypt tool and unique key for you. This software will decrypt all your encrypted files. What guarantees you have? You can send one of your encrypted file from your PC and we decrypt it for free. But we can decrypt only 1 file for free. File must not contain valuable information. You can get and look video overview decrypt tool: https://we.tl/t-c565B1ILoZ Price of private key and decrypt software is $980. Discount 50% available if you contact us first 72 hours, that's price for you is $490. Please note that you'll never restore your data without payment. Check your e-mail "Spam" or "Junk" folder if you don't get answer more than 6 hours. To get this software you need write on our e-mail: support@sysmail.ch Reserve e-mail address to contact us: supportsys@airmail.cc Your personal ID: 0453Jbdio

rsa_pubkey.plain

Signatures

  • Detected Djvu ransomware 10 IoCs
  • Djvu Ransomware

    Ransomware which is a variant of the STOP family.

  • Vidar

    Vidar is an infostealer based on Arkei stealer.

  • suricata: ET MALWARE Potential Dridex.Maldoc Minimal Executable Request

    suricata: ET MALWARE Potential Dridex.Maldoc Minimal Executable Request

  • suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)

    suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)

  • suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt) M2

    suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt) M2

  • suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (passwords.txt) M2

    suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (passwords.txt) M2

  • suricata: ET MALWARE Vidar/Arkei Stealer Client Data Upload

    suricata: ET MALWARE Vidar/Arkei Stealer Client Data Upload

  • suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil

    suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil

  • suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer HTTP POST Pattern

    suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer HTTP POST Pattern

  • Vidar Stealer 6 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 2 IoCs
  • Modifies file permissions 1 TTPs 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Accesses 2FA software files, possible credential harvesting 2 TTPs
  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Looks up external IP address via web service 3 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Suspicious use of SetThreadContext 3 IoCs
  • 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
  • Suspicious behavior: EnumeratesProcesses 12 IoCs
  • Suspicious use of WriteProcessMemory 37 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\d5093b4995d9d244ed4f6e6e77879d6290b20034730b17e3ed738eba8ef107a1.exe
    "C:\Users\Admin\AppData\Local\Temp\d5093b4995d9d244ed4f6e6e77879d6290b20034730b17e3ed738eba8ef107a1.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:2348
    • C:\Users\Admin\AppData\Local\Temp\d5093b4995d9d244ed4f6e6e77879d6290b20034730b17e3ed738eba8ef107a1.exe
      "C:\Users\Admin\AppData\Local\Temp\d5093b4995d9d244ed4f6e6e77879d6290b20034730b17e3ed738eba8ef107a1.exe"
      2⤵
      • Adds Run key to start application
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:2444
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\e609b2fa-56b4-45fa-a000-2105831157b8" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:3488
      • C:\Users\Admin\AppData\Local\Temp\d5093b4995d9d244ed4f6e6e77879d6290b20034730b17e3ed738eba8ef107a1.exe
        "C:\Users\Admin\AppData\Local\Temp\d5093b4995d9d244ed4f6e6e77879d6290b20034730b17e3ed738eba8ef107a1.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4240
        • C:\Users\Admin\AppData\Local\Temp\d5093b4995d9d244ed4f6e6e77879d6290b20034730b17e3ed738eba8ef107a1.exe
          "C:\Users\Admin\AppData\Local\Temp\d5093b4995d9d244ed4f6e6e77879d6290b20034730b17e3ed738eba8ef107a1.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:3544
          • C:\Users\Admin\AppData\Local\b3e8286a-4cdc-4557-87a8-8b2bc9bafc80\build2.exe
            "C:\Users\Admin\AppData\Local\b3e8286a-4cdc-4557-87a8-8b2bc9bafc80\build2.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:4324
            • C:\Users\Admin\AppData\Local\b3e8286a-4cdc-4557-87a8-8b2bc9bafc80\build2.exe
              "C:\Users\Admin\AppData\Local\b3e8286a-4cdc-4557-87a8-8b2bc9bafc80\build2.exe"
              6⤵
              • Executes dropped EXE
              • Loads dropped DLL
              • Checks processor information in registry
              • Suspicious behavior: EnumeratesProcesses
              PID:4536

Network

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

File Permissions Modification

1
T1222

Modify Registry

2
T1112

Install Root Certificate

1
T1130

Credential Access

Credentials in Files

3
T1081

Discovery

Query Registry

2
T1012

System Information Discovery

2
T1082

Collection

Data from Local System

3
T1005

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
    Filesize

    727B

    MD5

    944e0b205b374bae5a5ec6f004e0ccdc

    SHA1

    0f227641cff488a8610faf4151241c7d3b387358

    SHA256

    a27baf0aef166a0570dd5543e141fb1f97b8d6d19bf2dc1e91ee532b93927286

    SHA512

    fd1a8ea4a418817a4001af2a351d0cdce2ca25a0c5c65b762e42b5d15e57cba4a514b2169dc52946bcc168dbbdbce7b930a4e08cd3cbdc5acf3cf94d57d42007

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
    Filesize

    471B

    MD5

    7443608ab0c5be3ff317d4072fd2a4c1

    SHA1

    c14ca7d35ca32880627b147d57b520466ebb5213

    SHA256

    d4ab6ff49fb6c573a076269888c063cba4d52e9c2d0a03b488559e510df57ab2

    SHA512

    06adf1d67845a438089a93f00603ddfd734966673af1617493652d136bbaf0775c4fb64f15e4aad0caef105604414d09c756f2fee1b2d73396ad1eb93ba0f322

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
    Filesize

    402B

    MD5

    a0e7adb38241b7a652106bf9fea1e80c

    SHA1

    8cd78c564b78ec4fa2658469995a84cfbbd9e2c5

    SHA256

    6d48ff0480eab4c1ec977119a3e461313654dcd0096f21380950b64bfcadc87b

    SHA512

    f4157b119b81f436443db8329e8bb71d8f641bb4e5507f473ed3dc4330770ba7fb4a38ddfdba9f164d09cce03b7280163723385a74432e776412da69852078d5

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
    Filesize

    396B

    MD5

    e70fecf0e6584ce777f1ca0de439cbcb

    SHA1

    c730c281d85802216a8e0c888179f3d7131ecf4a

    SHA256

    f744b1cced3cd8f735f01cea852b50c46f2f93a38ad4b550826a8a9550fb2685

    SHA512

    73668587f2eaaf467a0af9838e641083338f7d2ac7fa749f7ec55ff0c85041a6e605d30446b60fde9bf8dedb8cf68f8570389a41f51d6484fbc189bd1d55e385

  • C:\Users\Admin\AppData\Local\b3e8286a-4cdc-4557-87a8-8b2bc9bafc80\build2.exe
    Filesize

    603KB

    MD5

    a13e3b18282318c65f096bad322b3c50

    SHA1

    2c76179e95e583b588bcd516e94e7a2da52d5299

    SHA256

    ba981a94852325debf0e4b478266f6efd8e4e9c5b149fd9ad277be0be5045768

    SHA512

    acb009f4b622ab7e8729dac2c45da975ba2305612c9575e5c8ce221edecf2d49da2236fc28b00d8f424a251765b935d8acce7bf40a1557d9fc79ba446250e786

  • C:\Users\Admin\AppData\Local\b3e8286a-4cdc-4557-87a8-8b2bc9bafc80\build2.exe
    Filesize

    603KB

    MD5

    a13e3b18282318c65f096bad322b3c50

    SHA1

    2c76179e95e583b588bcd516e94e7a2da52d5299

    SHA256

    ba981a94852325debf0e4b478266f6efd8e4e9c5b149fd9ad277be0be5045768

    SHA512

    acb009f4b622ab7e8729dac2c45da975ba2305612c9575e5c8ce221edecf2d49da2236fc28b00d8f424a251765b935d8acce7bf40a1557d9fc79ba446250e786

  • C:\Users\Admin\AppData\Local\b3e8286a-4cdc-4557-87a8-8b2bc9bafc80\build2.exe
    Filesize

    603KB

    MD5

    a13e3b18282318c65f096bad322b3c50

    SHA1

    2c76179e95e583b588bcd516e94e7a2da52d5299

    SHA256

    ba981a94852325debf0e4b478266f6efd8e4e9c5b149fd9ad277be0be5045768

    SHA512

    acb009f4b622ab7e8729dac2c45da975ba2305612c9575e5c8ce221edecf2d49da2236fc28b00d8f424a251765b935d8acce7bf40a1557d9fc79ba446250e786

  • C:\Users\Admin\AppData\Local\e609b2fa-56b4-45fa-a000-2105831157b8\d5093b4995d9d244ed4f6e6e77879d6290b20034730b17e3ed738eba8ef107a1.exe
    Filesize

    762KB

    MD5

    47d1cc15399a901f6f2d509b6db10565

    SHA1

    c60ba6490b78c4864bd21ff470132d36dc3c67d1

    SHA256

    d5093b4995d9d244ed4f6e6e77879d6290b20034730b17e3ed738eba8ef107a1

    SHA512

    322a3f243d4521e807e168ac67d65f0b2579f9bcb5939e75222df50569814d3fc7f22d88546b972def685cedba0e163ca9460d7bb42a41b1ae36a02aad40493f

  • \ProgramData\mozglue.dll
    Filesize

    133KB

    MD5

    8f73c08a9660691143661bf7332c3c27

    SHA1

    37fa65dd737c50fda710fdbde89e51374d0c204a

    SHA256

    3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

    SHA512

    0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

  • \ProgramData\nss3.dll
    Filesize

    1.2MB

    MD5

    bfac4e3c5908856ba17d41edcd455a51

    SHA1

    8eec7e888767aa9e4cca8ff246eb2aacb9170428

    SHA256

    e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

    SHA512

    2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

  • memory/2348-122-0x00000000021B0000-0x00000000022CB000-memory.dmp
    Filesize

    1.1MB

  • memory/2444-120-0x0000000000424141-mapping.dmp
  • memory/2444-124-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB

  • memory/2444-123-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB

  • memory/2444-121-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB

  • memory/2444-119-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB

  • memory/3488-125-0x0000000000000000-mapping.dmp
  • memory/3544-137-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB

  • memory/3544-130-0x0000000000424141-mapping.dmp
  • memory/3544-132-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB

  • memory/3544-131-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB

  • memory/4240-127-0x0000000000000000-mapping.dmp
  • memory/4324-146-0x0000000002130000-0x00000000021D8000-memory.dmp
    Filesize

    672KB

  • memory/4324-138-0x0000000000000000-mapping.dmp
  • memory/4536-145-0x0000000000400000-0x00000000004AA000-memory.dmp
    Filesize

    680KB

  • memory/4536-142-0x0000000000400000-0x00000000004AA000-memory.dmp
    Filesize

    680KB

  • memory/4536-147-0x0000000000400000-0x00000000004AA000-memory.dmp
    Filesize

    680KB

  • memory/4536-148-0x0000000000400000-0x00000000004AA000-memory.dmp
    Filesize

    680KB

  • memory/4536-143-0x00000000004717BA-mapping.dmp