Analysis

  • max time kernel
    121s
  • max time network
    130s
  • platform
    windows7_x64
  • resource
    win7-en-20211104
  • submitted
    15-11-2021 21:42

General

  • Target

    77bee09a3541dba878366b1c93835ebbfb316ab0b4487eb9b5f15eaa4c1277c3.exe

  • Size

    29.8MB

  • MD5

    f24c1c3b8d39e6e7a6d765c6ef69f8fd

  • SHA1

    c3aba9eeeaa4b4ddadea83a6327826e81187d222

  • SHA256

    77bee09a3541dba878366b1c93835ebbfb316ab0b4487eb9b5f15eaa4c1277c3

  • SHA512

    c4102d32a2232d8d5844b080cf75c51419c5f276a33cc9cc1c707796ddfc0a670cffb07d494a0641a102a3fdd4f74424105eebec6ad9bf70ea4a3955fc89bb6f

Malware Config

Extracted

Family

oski

C2

projectblackhat.com

Signatures

  • Oski

    Oski is an infostealer targeting browser data, crypto wallets.

  • Downloads MZ/PE file
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 7 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Checks installed software on the system 1 TTPs

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

  • 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 1 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Kills process with taskkill 1 IoCs
  • Modifies registry class 2 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of FindShellTrayWindow 9 IoCs
  • Suspicious use of SendNotifyMessage 8 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\77bee09a3541dba878366b1c93835ebbfb316ab0b4487eb9b5f15eaa4c1277c3.exe
    "C:\Users\Admin\AppData\Local\Temp\77bee09a3541dba878366b1c93835ebbfb316ab0b4487eb9b5f15eaa4c1277c3.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of WriteProcessMemory
    PID:1380
    • C:\Windows\SysWOW64\rundll32.exe
      "C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\AppData\Local\Temp\2021-11-08 10-19-23.rar
      2⤵
      • Modifies registry class
      • Suspicious use of WriteProcessMemory
      PID:556
      • C:\Program Files\VideoLAN\VLC\vlc.exe
        "C:\Program Files\VideoLAN\VLC\vlc.exe" --started-from-file "C:\Users\Admin\AppData\Local\Temp\2021-11-08 10-19-23.rar"
        3⤵
        • Suspicious behavior: AddClipboardFormatListener
        • Suspicious behavior: GetForegroundWindowSpam
        • Suspicious use of FindShellTrayWindow
        • Suspicious use of SendNotifyMessage
        • Suspicious use of SetWindowsHookEx
        PID:1404
    • C:\Users\Admin\AppData\Local\Temp\ORB.net.exe
      "C:\Users\Admin\AppData\Local\Temp\ORB.net.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Checks processor information in registry
      • Suspicious use of WriteProcessMemory
      PID:868
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c taskkill /pid 868 & erase C:\Users\Admin\AppData\Local\Temp\ORB.net.exe & RD /S /Q C:\\ProgramData\\817429986245390\\* & exit
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:832
        • C:\Windows\SysWOW64\taskkill.exe
          taskkill /pid 868
          4⤵
          • Kills process with taskkill
          • Suspicious use of AdjustPrivilegeToken
          PID:1504

Network

MITRE ATT&CK Matrix ATT&CK v6

Credential Access

Credentials in Files

2
T1081

Discovery

Query Registry

2
T1012

System Information Discovery

2
T1082

Collection

Data from Local System

2
T1005

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\2021-11-08 10-19-23.rar
    MD5

    e24250b0a416c4570eaff0f9aa5bbdde

    SHA1

    0815102ebb5890dacaf8ec07b424e1e5dc76ba83

    SHA256

    4e434e1de23f7d5a5a774c9f42171c4df1112d329216a911e05c1bb090a3d4a0

    SHA512

    4f84f9c1ea4308aa9578cd5b87c56a78d51a4519cad4db8b9a9e7c61921440afafb37574e70a4cd0e080afb51ca2e9259e3d475eed6fa500efdb41c09251c9a2

  • C:\Users\Admin\AppData\Local\Temp\ORB.net.exe
    MD5

    e67f4583ef6c8cea06288afc539beb88

    SHA1

    dcf6a480ebb9f84b7d6f7f04edd2d8753e7a5e21

    SHA256

    218296d2ac0f8fdff0ff27adf2ee5d196a646c9b6cc2a2f8d60ef04b8f2bb59b

    SHA512

    7051b007b1f810369d6fe9506dd02016dfb016d4a03aa4a2fb2ac71e9a689b4ad707b07089dd1eabc4a7a3a291cab1a6500111e7b0ec8468f970908ff2b06af4

  • C:\Users\Admin\AppData\Local\Temp\ORB.net.exe
    MD5

    e67f4583ef6c8cea06288afc539beb88

    SHA1

    dcf6a480ebb9f84b7d6f7f04edd2d8753e7a5e21

    SHA256

    218296d2ac0f8fdff0ff27adf2ee5d196a646c9b6cc2a2f8d60ef04b8f2bb59b

    SHA512

    7051b007b1f810369d6fe9506dd02016dfb016d4a03aa4a2fb2ac71e9a689b4ad707b07089dd1eabc4a7a3a291cab1a6500111e7b0ec8468f970908ff2b06af4

  • \??\PIPE\srvsvc
    MD5

    d41d8cd98f00b204e9800998ecf8427e

    SHA1

    da39a3ee5e6b4b0d3255bfef95601890afd80709

    SHA256

    e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

    SHA512

    cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

  • \ProgramData\mozglue.dll
    MD5

    8f73c08a9660691143661bf7332c3c27

    SHA1

    37fa65dd737c50fda710fdbde89e51374d0c204a

    SHA256

    3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

    SHA512

    0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

  • \ProgramData\msvcp140.dll
    MD5

    109f0f02fd37c84bfc7508d4227d7ed5

    SHA1

    ef7420141bb15ac334d3964082361a460bfdb975

    SHA256

    334e69ac9367f708ce601a6f490ff227d6c20636da5222f148b25831d22e13d4

    SHA512

    46eb62b65817365c249b48863d894b4669e20fcb3992e747cd5c9fdd57968e1b2cf7418d1c9340a89865eadda362b8db51947eb4427412eb83b35994f932fd39

  • \ProgramData\nss3.dll
    MD5

    bfac4e3c5908856ba17d41edcd455a51

    SHA1

    8eec7e888767aa9e4cca8ff246eb2aacb9170428

    SHA256

    e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

    SHA512

    2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

  • \ProgramData\sqlite3.dll
    MD5

    e477a96c8f2b18d6b5c27bde49c990bf

    SHA1

    e980c9bf41330d1e5bd04556db4646a0210f7409

    SHA256

    16574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660

    SHA512

    335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c

  • \ProgramData\vcruntime140.dll
    MD5

    7587bf9cb4147022cd5681b015183046

    SHA1

    f2106306a8f6f0da5afb7fc765cfa0757ad5a628

    SHA256

    c40bb03199a2054dabfc7a8e01d6098e91de7193619effbd0f142a7bf031c14d

    SHA512

    0b63e4979846ceba1b1ed8470432ea6aa18cca66b5f5322d17b14bc0dfa4b2ee09ca300a016e16a01db5123e4e022820698f46d9bad1078bd24675b4b181e91f

  • \Users\Admin\AppData\Local\Temp\ORB.net.exe
    MD5

    e67f4583ef6c8cea06288afc539beb88

    SHA1

    dcf6a480ebb9f84b7d6f7f04edd2d8753e7a5e21

    SHA256

    218296d2ac0f8fdff0ff27adf2ee5d196a646c9b6cc2a2f8d60ef04b8f2bb59b

    SHA512

    7051b007b1f810369d6fe9506dd02016dfb016d4a03aa4a2fb2ac71e9a689b4ad707b07089dd1eabc4a7a3a291cab1a6500111e7b0ec8468f970908ff2b06af4

  • \Users\Admin\AppData\Local\Temp\ORB.net.exe
    MD5

    e67f4583ef6c8cea06288afc539beb88

    SHA1

    dcf6a480ebb9f84b7d6f7f04edd2d8753e7a5e21

    SHA256

    218296d2ac0f8fdff0ff27adf2ee5d196a646c9b6cc2a2f8d60ef04b8f2bb59b

    SHA512

    7051b007b1f810369d6fe9506dd02016dfb016d4a03aa4a2fb2ac71e9a689b4ad707b07089dd1eabc4a7a3a291cab1a6500111e7b0ec8468f970908ff2b06af4

  • memory/556-56-0x0000000000000000-mapping.dmp
  • memory/832-71-0x0000000000000000-mapping.dmp
  • memory/868-60-0x0000000000000000-mapping.dmp
  • memory/1380-55-0x0000000074E51000-0x0000000074E53000-memory.dmp
    Filesize

    8KB

  • memory/1404-63-0x0000000000000000-mapping.dmp
  • memory/1504-72-0x0000000000000000-mapping.dmp