Analysis

  • max time kernel
    122s
  • max time network
    131s
  • platform
    windows7_x64
  • resource
    win7-en-20211104
  • submitted
    01-12-2021 07:56

General

  • Target

    f3a4459b98919ba055a2c9437d092d18c889d5a1bbaea31a2cbe5ac250bc600a.bin.exe

  • Size

    847KB

  • MD5

    2d4445eb93e7f578faea18f9778394e6

  • SHA1

    e1a5cb23e196a248fe928aadd002dbf8e786ffaa

  • SHA256

    f3a4459b98919ba055a2c9437d092d18c889d5a1bbaea31a2cbe5ac250bc600a

  • SHA512

    c4b6c88ca9c75acd3ffcc0ea8f8b4f57d2b60eadb0f8f8b9838dcf8fb8881f557a71cb58366d35ce808de1e0b9dadd16242accb0e3978d7dcc088c8c6448657b

Malware Config

Extracted

Family

djvu

C2

http://tbpws.top/fhsgtsspen6/get.php

Attributes
  • extension

    .wiot

  • offline_id

    sZ9rF572Y03XTlUZsBUVlV9YksFOEsyIfGx58yt1

  • payload_url

    http://securebiz.org/dl/build2.exe

    http://tbpws.top/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-CtDpAM1g5f 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: manager@mailtemp.ch Reserve e-mail address to contact us: managerhelper@airmail.cc Your personal ID: 0333gSd743d

rsa_pubkey.plain

Signatures

  • Detected Djvu ransomware 6 IoCs
  • Djvu Ransomware

    Ransomware which is a variant of the STOP family.

  • Modifies file permissions 1 TTPs 1 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • 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 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies system certificate store 2 TTPs 5 IoCs
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\f3a4459b98919ba055a2c9437d092d18c889d5a1bbaea31a2cbe5ac250bc600a.bin.exe
    "C:\Users\Admin\AppData\Local\Temp\f3a4459b98919ba055a2c9437d092d18c889d5a1bbaea31a2cbe5ac250bc600a.bin.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:1168
    • C:\Users\Admin\AppData\Local\Temp\f3a4459b98919ba055a2c9437d092d18c889d5a1bbaea31a2cbe5ac250bc600a.bin.exe
      "C:\Users\Admin\AppData\Local\Temp\f3a4459b98919ba055a2c9437d092d18c889d5a1bbaea31a2cbe5ac250bc600a.bin.exe"
      2⤵
      • Adds Run key to start application
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:756
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\56596757-24d2-4aea-805a-160f145e6ff6" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:1056
      • C:\Users\Admin\AppData\Local\Temp\f3a4459b98919ba055a2c9437d092d18c889d5a1bbaea31a2cbe5ac250bc600a.bin.exe
        "C:\Users\Admin\AppData\Local\Temp\f3a4459b98919ba055a2c9437d092d18c889d5a1bbaea31a2cbe5ac250bc600a.bin.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1492
        • C:\Users\Admin\AppData\Local\Temp\f3a4459b98919ba055a2c9437d092d18c889d5a1bbaea31a2cbe5ac250bc600a.bin.exe
          "C:\Users\Admin\AppData\Local\Temp\f3a4459b98919ba055a2c9437d092d18c889d5a1bbaea31a2cbe5ac250bc600a.bin.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Modifies system certificate store
          • Suspicious behavior: EnumeratesProcesses
          PID:1952

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

Discovery

System Information Discovery

1
T1082

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
    MD5

    237cc7db072d97a949e15c2d8dbea891

    SHA1

    43ef7b53667e94ae04496fa6cf6efc7f9a8ba83f

    SHA256

    7f9669eedb0bdb3b6647128101ec024ac5fc2447bd4372fbc8b4389f5d255acb

    SHA512

    07c69dbcb95369ffcfdcbe402d582e7dcad1b5f2976f9156460197c891eefae41b43d2640df96d08c4ae2338a5c8d03aeaa662487d0635678d34622aede96b2b

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
    MD5

    5db4d4fdb4428e5d3c794ed0a7c25958

    SHA1

    374866bf683c5c6a3620d7dcfe29ef04221c4723

    SHA256

    19ee4604acc3747d7a43fe1703dcacf39ca80e58a5f20e8607172b8f7037e45e

    SHA512

    8ad3ce80577dfc0e4edfb40c548d6b5ba88ca22bca51d0c9fe757d9e155372fe4c212ae12e8f7ed13fd40369a0722399b41c5f0edf9eb03de57fbd9890b2989d

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
    MD5

    c4accec818b6016eba452c10c9c2f488

    SHA1

    e793457afbbc53ec9f0b2b4113b16352379fc78b

    SHA256

    821992804d1cebe23d78c14e1aba61fbf6c88b711eaa7e12b1fff4d9fd6bebde

    SHA512

    fab75d47d2802e382dfb3e1ac4896dbf547bada2bafff897dd7152f3e8bb4d597b626ae5b90a5b5d5ed543f4cfe33a3d24c8fd62e4c3985ac7b5f9d1ee1fabde

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
    MD5

    a4b4e2754ca1b67d75c024d40e0d4f05

    SHA1

    a208e97c0390b42cdf91a9d5adb4e4c9569bc1b7

    SHA256

    a10b5ca97ad022ef8e28b81abaed56ba709918db07a74840e2220df0f7c6f4a1

    SHA512

    42638829f05fea66f197e2ba0d1f90f77c44ae3d38b967af4fc32f86e672d62a7f0136b18954a228672ab573a3113341911a06166e5da4a478c7648ea0a75345

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
    MD5

    ba6a5d43c8d145069fd85e896d133b83

    SHA1

    ea65173c993c71b3c0309cc8470c0660671a1741

    SHA256

    72af383d76f829f3a708ad766d090f1f9b7180eb4d51d0e04eb2a224f6ddd7e3

    SHA512

    61b331e2e83274222d08d89df3a118eede286357f4f7e2758d54e1ac22d2343c3423a941e5fd4769ad499f16a39d4b1dd2c5a61d8468644a4a6fc8a61c1eda1e

  • C:\Users\Admin\AppData\Local\56596757-24d2-4aea-805a-160f145e6ff6\f3a4459b98919ba055a2c9437d092d18c889d5a1bbaea31a2cbe5ac250bc600a.bin.exe
    MD5

    2d4445eb93e7f578faea18f9778394e6

    SHA1

    e1a5cb23e196a248fe928aadd002dbf8e786ffaa

    SHA256

    f3a4459b98919ba055a2c9437d092d18c889d5a1bbaea31a2cbe5ac250bc600a

    SHA512

    c4b6c88ca9c75acd3ffcc0ea8f8b4f57d2b60eadb0f8f8b9838dcf8fb8881f557a71cb58366d35ce808de1e0b9dadd16242accb0e3978d7dcc088c8c6448657b

  • memory/756-57-0x0000000000424141-mapping.dmp
  • memory/756-56-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB

  • memory/756-58-0x00000000760C1000-0x00000000760C3000-memory.dmp
    Filesize

    8KB

  • memory/756-60-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB

  • memory/1056-61-0x0000000000000000-mapping.dmp
  • memory/1168-59-0x0000000001810000-0x000000000192B000-memory.dmp
    Filesize

    1.1MB

  • memory/1168-55-0x0000000000230000-0x00000000002C2000-memory.dmp
    Filesize

    584KB

  • memory/1492-64-0x0000000000240000-0x00000000002D2000-memory.dmp
    Filesize

    584KB

  • memory/1492-63-0x0000000000000000-mapping.dmp
  • memory/1952-66-0x0000000000424141-mapping.dmp
  • memory/1952-73-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB