Analysis

  • max time kernel
    142s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    28-05-2024 04:57

General

  • Target

    a9238bb7a0c565768ab6478114704dce98c161e82d9f8b59b5989f7a5d1d189e.exe

  • Size

    126KB

  • MD5

    84134031ba193cf5cc6da995ce298cd2

  • SHA1

    e955ce1fa9b31084c822cc641f49a28859b82371

  • SHA256

    a9238bb7a0c565768ab6478114704dce98c161e82d9f8b59b5989f7a5d1d189e

  • SHA512

    cab52649cb176c160efccb21b8a3c3f16311ba30e25c86e1c6878a84fe4a60c9d1073f2df673c05823145fb27fb0879703bd8c8daaeac13ff310e39d3c5f3c6f

  • SSDEEP

    3072:BNEp/EAS/mhYugM7vewJ8oJno9Xxh+tuk0oFaWJxT6XyzJ53Lnhdgddz5:nEpBduutSwJ8oJn8X+turkJ/6Xy57hS1

Score
10/10

Malware Config

Extracted

Path

C:\Program Files\!nissenvelten!HOW_TO_RESTORE.log

Family

rook

Ransom Note
Hello! We warned you, but you even didn't replied Forced shutdown of devices can lead to the loss of all data. Do not forcibly disconnect storage volumes from hosts, don't interrupt process. Damaged information cannot be recovered. All data is properly protected against unauthorized access by steady encryption technology. We have downloaded essential data of company: - Huge amount of files, including: HR,Financial,Accounting,... - Large amounts of personal records of your employees and residents. - about 1TB (!!!) of data! In case if you refuse to cooperate with us, all essential data will be sold or published at dark marketplace. Full details and proofs will be provided in case of contacting us by following emails. [email protected] [email protected] It's just a business. We can help you to quickly recover all your files. We will explain what kind of vulnerability was used to hack your network. If you will not cooperate with us, you will never know how your network was compromised. We guarantee this will happen again. We can decrypt 2 small files (up to 1MB) for free. Send files by email. Register new email account at secure mail service like mailfence, protonmail to be sure that outgoing email not blocked by spam filter. Don't use gmail! WARNING! Don't report to police. They will suspend financial activity of company and negotiation process. �

Signatures

  • Rook

    Rook is a ransomware which copies from NightSky ransomware.

  • Renames multiple (6930) files with added filename extension

    This suggests ransomware activity of encrypting all the files on the system.

  • Drops file in Program Files directory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a9238bb7a0c565768ab6478114704dce98c161e82d9f8b59b5989f7a5d1d189e.exe
    "C:\Users\Admin\AppData\Local\Temp\a9238bb7a0c565768ab6478114704dce98c161e82d9f8b59b5989f7a5d1d189e.exe"
    1⤵
    • Drops file in Program Files directory
    PID:1616
  • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
    "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1044 --field-trial-handle=2280,i,4114443225282860369,4764091921472631035,262144 --variations-seed-version /prefetch:8
    1⤵
      PID:2376

    Network

    MITRE ATT&CK Matrix

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Program Files (x86)\Microsoft\EdgeWebView\Application\122.0.2365.52\WidevineCdm\_platform_specific\win_x64\widevinecdm.dll.sig.nissenvelten-sjj3hhut

      Filesize

      2KB

      MD5

      e600823c746e6925b136cc3cdda01fd5

      SHA1

      9b62121e2ca40792452628b6fa33eff90d6d928a

      SHA256

      fbb1d85b52fd4a30f7f172220bffa1be2b4ee46a40f95cf99fd92184673e6ce6

      SHA512

      dbc1bb315de1e015eed371c3e79d1327da82dd477080b2ae11441ec0afc3b2c3136594da6b7dd7e9c5807ab84eabe7eb9cded4a67c6cbd1f18a0e563c80d2e65

    • C:\Program Files\!nissenvelten!HOW_TO_RESTORE.log

      Filesize

      1KB

      MD5

      1ac13e1c2b35dfaf377ceb55e61e5309

      SHA1

      e53185eee04a0578483054e507d639be2635b4d7

      SHA256

      72e9a50a52585a25c5529b846cf586946694e46a912a97b526e4a7067ab1d7e6

      SHA512

      fa702569f13d82d24e78cba21397f0d53281c0a93db7a484bb974f4cb965da23dd4691c7061de6bfd54e40d5d32faa2e8b8af52968191b91f9164f5c7d459fa6

    • memory/1616-0-0x0000000000290000-0x00000000002E2000-memory.dmp

      Filesize

      328KB

    • memory/1616-3-0x0000000000DA0000-0x0000000000DB9000-memory.dmp

      Filesize

      100KB

    • memory/1616-1176-0x0000000000DA0000-0x0000000000DB9000-memory.dmp

      Filesize

      100KB