Analysis

  • max time kernel
    86s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220721-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220721-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06-08-2022 06:19

General

  • Target

    45376600c8e5307a742d759f359c63a8bcfff11cd45b1ac6d01e1c76a4fa632f.exe

  • Size

    831KB

  • MD5

    b6eb62288ca782e26d71236994995d57

  • SHA1

    ed5080d2301df02600b3ec0d3e4de91541bb32e8

  • SHA256

    45376600c8e5307a742d759f359c63a8bcfff11cd45b1ac6d01e1c76a4fa632f

  • SHA512

    0b2f11dd857390155a8520aaa64693bae19caa67b27da8026937f2aec491861da761841e9c309142b1a0e7d3aa87d13ac1be0904481ed8be9dbf48be1b9276fd

Malware Config

Extracted

Family

djvu

C2

http://acacaca.org/test2/get.php

Attributes
  • extension

    .vvyu

  • offline_id

    rE5LpDv2ftYRXAo7bC18EpzfRMTHSGjgfyIMfZt1

  • payload_url

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

    http://acacaca.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-QsoSRIeAK6 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@bestyourmail.ch Reserve e-mail address to contact us: datarestorehelp@airmail.cc Your personal ID: 0531Jhyjd

rsa_pubkey.plain

Signatures

  • Detected Djvu ransomware 10 IoCs
  • Djvu Ransomware

    Ransomware which is a variant of the STOP family.

  • Downloads MZ/PE file
  • Executes dropped EXE 2 IoCs
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • 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.

  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of WriteProcessMemory 37 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\45376600c8e5307a742d759f359c63a8bcfff11cd45b1ac6d01e1c76a4fa632f.exe
    "C:\Users\Admin\AppData\Local\Temp\45376600c8e5307a742d759f359c63a8bcfff11cd45b1ac6d01e1c76a4fa632f.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:1736
    • C:\Users\Admin\AppData\Local\Temp\45376600c8e5307a742d759f359c63a8bcfff11cd45b1ac6d01e1c76a4fa632f.exe
      "C:\Users\Admin\AppData\Local\Temp\45376600c8e5307a742d759f359c63a8bcfff11cd45b1ac6d01e1c76a4fa632f.exe"
      2⤵
      • Checks computer location settings
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:4680
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\4f94771b-3544-4389-90a9-60fa436cc1c6" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:3248
      • C:\Users\Admin\AppData\Local\Temp\45376600c8e5307a742d759f359c63a8bcfff11cd45b1ac6d01e1c76a4fa632f.exe
        "C:\Users\Admin\AppData\Local\Temp\45376600c8e5307a742d759f359c63a8bcfff11cd45b1ac6d01e1c76a4fa632f.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:444
        • C:\Users\Admin\AppData\Local\Temp\45376600c8e5307a742d759f359c63a8bcfff11cd45b1ac6d01e1c76a4fa632f.exe
          "C:\Users\Admin\AppData\Local\Temp\45376600c8e5307a742d759f359c63a8bcfff11cd45b1ac6d01e1c76a4fa632f.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Checks computer location settings
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:4664
          • C:\Users\Admin\AppData\Local\e9438ebc-ba64-45ca-b4c9-880e4384a0c9\build2.exe
            "C:\Users\Admin\AppData\Local\e9438ebc-ba64-45ca-b4c9-880e4384a0c9\build2.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:3148
            • C:\Users\Admin\AppData\Local\e9438ebc-ba64-45ca-b4c9-880e4384a0c9\build2.exe
              "C:\Users\Admin\AppData\Local\e9438ebc-ba64-45ca-b4c9-880e4384a0c9\build2.exe"
              6⤵
              • Executes dropped EXE
              • Checks processor information in registry
              • Suspicious behavior: EnumeratesProcesses
              PID:3152

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

1
T1112

Credential Access

Credentials in Files

3
T1081

Discovery

Query Registry

3
T1012

System Information Discovery

3
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

    2KB

    MD5

    eba45bc75daf7421d4767f04582068ca

    SHA1

    e2d2b46d3780a8b7cdde6e542430f0da28684ce8

    SHA256

    87f79123a6048371f5e4eccca848509ff8315dea4be740c8480fe945c02b4f38

    SHA512

    0c081c029224806b1f1f200da673a9554e5d40756736f9ca8bc073c25703092c6d1e72a2fd971b41bedeba26e6ca9fa85486df39f852505925a49d8b94e0e330

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

    1KB

    MD5

    4f74b1c3f52834fb5d5d0946410f286a

    SHA1

    e8b1734733535d236f422c282271e97b784b5261

    SHA256

    56b6f9f565e620e3cc377ac2265180c96efff2844f11cbb229eef977327869f1

    SHA512

    b84101ebe8570b2f0ecbefafcf58b941100ac6efc9cbbfc711e57bedf6cb6fc62141bd2d66c34f4b316568948ff6448c96ddef2cfde625965a9ea5968beefb2c

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

    488B

    MD5

    3e4ef29cd1de943981bd9435ee45ac72

    SHA1

    69583b8a61dae202d406fb5d2df9f275d7c9edec

    SHA256

    58c4af63f7211c810347d75ae0325991eb8720849128ccd5d3cc5efee326bf1c

    SHA512

    bdac65ff54ef12e3cbf66b6cd154677d84861a7201564c06856e27b3ac91ac18ac8ede4be23a283a5d015429868de917a2f20866deada28cc528850f670c289a

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

    396B

    MD5

    21c8d349ac19efb6e10e57d1bd16873a

    SHA1

    cb6b7a1352997980d6dd3f717dd1b3bbab5ad001

    SHA256

    044220854711204698c6ecf3d6fd131a72bb2a57377097747c698562ab714c17

    SHA512

    91296102fef2a311202d1cf4b56f5b63433a314d4c49735d7efd3ef232726fe9142429b338cab6d3e88cdaf7bbfedaae3bbc9acb5a4d00d577f50fb8c9b1d5ea

  • C:\Users\Admin\AppData\Local\4f94771b-3544-4389-90a9-60fa436cc1c6\45376600c8e5307a742d759f359c63a8bcfff11cd45b1ac6d01e1c76a4fa632f.exe
    Filesize

    831KB

    MD5

    b6eb62288ca782e26d71236994995d57

    SHA1

    ed5080d2301df02600b3ec0d3e4de91541bb32e8

    SHA256

    45376600c8e5307a742d759f359c63a8bcfff11cd45b1ac6d01e1c76a4fa632f

    SHA512

    0b2f11dd857390155a8520aaa64693bae19caa67b27da8026937f2aec491861da761841e9c309142b1a0e7d3aa87d13ac1be0904481ed8be9dbf48be1b9276fd

  • C:\Users\Admin\AppData\Local\e9438ebc-ba64-45ca-b4c9-880e4384a0c9\build2.exe
    Filesize

    438KB

    MD5

    2f3d0323ba962334ef87ed098ad02289

    SHA1

    5b4c70e331af83eaf384f45a01e322b094353375

    SHA256

    12a51367c5c85ff3c1dc73743cface2e01accecf2879a36adbddf566d52987b3

    SHA512

    1e33ace1068f614bfac35aa67733c2806328b586be273a611409df87be03c5edc9e312ab213004c8fab71453ef5e34e474d9273c4a97d95d135c18f440674ad3

  • C:\Users\Admin\AppData\Local\e9438ebc-ba64-45ca-b4c9-880e4384a0c9\build2.exe
    Filesize

    438KB

    MD5

    2f3d0323ba962334ef87ed098ad02289

    SHA1

    5b4c70e331af83eaf384f45a01e322b094353375

    SHA256

    12a51367c5c85ff3c1dc73743cface2e01accecf2879a36adbddf566d52987b3

    SHA512

    1e33ace1068f614bfac35aa67733c2806328b586be273a611409df87be03c5edc9e312ab213004c8fab71453ef5e34e474d9273c4a97d95d135c18f440674ad3

  • C:\Users\Admin\AppData\Local\e9438ebc-ba64-45ca-b4c9-880e4384a0c9\build2.exe
    Filesize

    438KB

    MD5

    2f3d0323ba962334ef87ed098ad02289

    SHA1

    5b4c70e331af83eaf384f45a01e322b094353375

    SHA256

    12a51367c5c85ff3c1dc73743cface2e01accecf2879a36adbddf566d52987b3

    SHA512

    1e33ace1068f614bfac35aa67733c2806328b586be273a611409df87be03c5edc9e312ab213004c8fab71453ef5e34e474d9273c4a97d95d135c18f440674ad3

  • memory/444-144-0x000000000219E000-0x0000000002230000-memory.dmp
    Filesize

    584KB

  • memory/444-139-0x0000000000000000-mapping.dmp
  • memory/1736-133-0x000000000227D000-0x000000000230F000-memory.dmp
    Filesize

    584KB

  • memory/1736-134-0x00000000023B0000-0x00000000024CB000-memory.dmp
    Filesize

    1.1MB

  • memory/3148-159-0x00000000005DD000-0x0000000000606000-memory.dmp
    Filesize

    164KB

  • memory/3148-161-0x0000000001FA0000-0x0000000001FE6000-memory.dmp
    Filesize

    280KB

  • memory/3148-152-0x0000000000000000-mapping.dmp
  • memory/3152-155-0x0000000000000000-mapping.dmp
  • memory/3152-164-0x0000000060900000-0x0000000060992000-memory.dmp
    Filesize

    584KB

  • memory/3152-163-0x0000000000400000-0x0000000000459000-memory.dmp
    Filesize

    356KB

  • memory/3152-162-0x0000000000400000-0x0000000000459000-memory.dmp
    Filesize

    356KB

  • memory/3152-156-0x0000000000400000-0x0000000000459000-memory.dmp
    Filesize

    356KB

  • memory/3152-160-0x0000000000400000-0x0000000000459000-memory.dmp
    Filesize

    356KB

  • memory/3152-158-0x0000000000400000-0x0000000000459000-memory.dmp
    Filesize

    356KB

  • memory/3248-137-0x0000000000000000-mapping.dmp
  • memory/4664-143-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB

  • memory/4664-151-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB

  • memory/4664-150-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB

  • memory/4664-141-0x0000000000000000-mapping.dmp
  • memory/4664-145-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB

  • memory/4680-130-0x0000000000000000-mapping.dmp
  • memory/4680-136-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB

  • memory/4680-135-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB

  • memory/4680-131-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB

  • memory/4680-132-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB

  • memory/4680-140-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB