Analysis

  • max time kernel
    1798s
  • max time network
    1609s
  • platform
    windows10-1703_x64
  • resource
    win10-20231215-en
  • resource tags

    arch:x64arch:x86image:win10-20231215-enlocale:en-usos:windows10-1703-x64system
  • submitted
    18-01-2024 03:36

General

  • Target

    PcOptimizer.exe

  • Size

    1.6MB

  • MD5

    31578327d2ce62a033df100eb8e5db21

  • SHA1

    abbf90eb2b2064181f9d2e2b3839d32b8608607f

  • SHA256

    ccb9b6b18a926cb5429ce957478416a5bbe19b9124521d1974454d0ff0fde17e

  • SHA512

    6980ee171e1614414bfd3b2314adeab2df00a1447449ddf7f41ea9328ae4dc99cdd3850541f22a6ba080d40e84e66fb4b085eb8e37aa187d10e7af4693e0cdc8

  • SSDEEP

    49152:JkTq24GjdGSiqkqXfd+/9AqYanieKdsS:J1EjdGSiqkqXf0FLYW

Malware Config

Extracted

Family

stealerium

C2

https://discord.com/api/webhooks/1197035124232028301/sHUczEA6_tw3a11veY_04e7UYZLqHfIVPsGIZS0Vw4ap6GVt8E0gj0TGwqKyyPopNMrA

Signatures

  • Stealerium

    An open source info stealer written in C# first seen in May 2022.

  • Reads user/profile data of web browsers 2 TTPs

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

  • Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • Looks up external IP address via web service 1 IoCs

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

  • Drops file in Windows directory 2 IoCs
  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

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

  • Checks processor information in registry 2 TTPs 2 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 7 IoCs
  • Suspicious use of FindShellTrayWindow 64 IoCs
  • Suspicious use of SendNotifyMessage 64 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 21 IoCs
  • outlook_office_path 1 IoCs
  • outlook_win_path 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\PcOptimizer.exe
    "C:\Users\Admin\AppData\Local\Temp\PcOptimizer.exe"
    1⤵
    • Accesses Microsoft Outlook profiles
    • Checks processor information in registry
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: GetForegroundWindowSpam
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    • outlook_office_path
    • outlook_win_path
    PID:4756
    • C:\Windows\SysWOW64\cmd.exe
      "cmd.exe" /C chcp 65001 && netsh wlan show profile | findstr All
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:5032
      • C:\Windows\SysWOW64\chcp.com
        chcp 65001
        3⤵
          PID:3320
        • C:\Windows\SysWOW64\netsh.exe
          netsh wlan show profile
          3⤵
            PID:1164
          • C:\Windows\SysWOW64\findstr.exe
            findstr All
            3⤵
              PID:1160
          • C:\Windows\SysWOW64\cmd.exe
            "cmd.exe" /C chcp 65001 && netsh wlan show networks mode=bssid
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:3208
            • C:\Windows\SysWOW64\chcp.com
              chcp 65001
              3⤵
                PID:716
              • C:\Windows\SysWOW64\netsh.exe
                netsh wlan show networks mode=bssid
                3⤵
                  PID:2340
            • C:\Windows\system32\msiexec.exe
              C:\Windows\system32\msiexec.exe /V
              1⤵
              • Suspicious use of AdjustPrivilegeToken
              PID:1452
            • C:\Windows\system32\taskmgr.exe
              "C:\Windows\system32\taskmgr.exe" /7
              1⤵
              • Drops file in Windows directory
              • Checks SCSI registry key(s)
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              • Suspicious use of FindShellTrayWindow
              • Suspicious use of SendNotifyMessage
              PID:924

            Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            • C:\Users\Admin\AppData\Local\78c09df400ba7309548c26aa73a1ee26\Admin@CFZMTHEF_en-US\Browsers\Firefox\Bookmarks.txt

              Filesize

              105B

              MD5

              2e9d094dda5cdc3ce6519f75943a4ff4

              SHA1

              5d989b4ac8b699781681fe75ed9ef98191a5096c

              SHA256

              c84c98bbf5e0ef9c8d0708b5d60c5bb656b7d6be5135d7f7a8d25557e08cf142

              SHA512

              d1f7eed00959e902bdb2125b91721460d3ff99f3bdfc1f2a343d4f58e8d4e5e5a06c0c6cdc0379211c94510f7c00d7a8b34fa7d0ca0c3d54cbbe878f1e9812b7

            • C:\Users\Admin\AppData\Local\78c09df400ba7309548c26aa73a1ee26\Admin@CFZMTHEF_en-US\Directories\OneDrive.txt

              Filesize

              25B

              MD5

              966247eb3ee749e21597d73c4176bd52

              SHA1

              1e9e63c2872cef8f015d4b888eb9f81b00a35c79

              SHA256

              8ddfc481b1b6ae30815ecce8a73755862f24b3bb7fdebdbf099e037d53eb082e

              SHA512

              bd30aec68c070e86e3dec787ed26dd3d6b7d33d83e43cb2d50f9e2cff779fee4c96afbbe170443bd62874073a844beb29a69b10c72c54d7d444a8d86cfd7b5aa

            • C:\Users\Admin\AppData\Local\78c09df400ba7309548c26aa73a1ee26\Admin@CFZMTHEF_en-US\Directories\Startup.txt

              Filesize

              24B

              MD5

              68c93da4981d591704cea7b71cebfb97

              SHA1

              fd0f8d97463cd33892cc828b4ad04e03fc014fa6

              SHA256

              889ed51f9c16a4b989bda57957d3e132b1a9c117ee84e208207f2fa208a59483

              SHA512

              63455c726b55f2d4de87147a75ff04f2daa35278183969ccf185d23707840dd84363bec20d4e8c56252196ce555001ca0e61b3f4887d27577081fdef9e946402

            • C:\Users\Admin\AppData\Local\78c09df400ba7309548c26aa73a1ee26\Admin@CFZMTHEF_en-US\Directories\Videos.txt

              Filesize

              23B

              MD5

              1fddbf1169b6c75898b86e7e24bc7c1f

              SHA1

              d2091060cb5191ff70eb99c0088c182e80c20f8c

              SHA256

              a67aa329b7d878de61671e18cd2f4b011d11cbac67ea779818c6dafad2d70733

              SHA512

              20bfeafde7fec1753fef59de467bd4a3dd7fe627e8c44e95fe62b065a5768c4508e886ec5d898e911a28cf6365f455c9ab1ebe2386d17a76f53037f99061fd4d

            • C:\Users\Admin\AppData\Local\78c09df400ba7309548c26aa73a1ee26\Admin@CFZMTHEF_en-US\System\Apps.txt

              Filesize

              4KB

              MD5

              1efa189820620a27e59f77d8f16b0e35

              SHA1

              c0ec03434375bec1f693d569077576f7d16c1407

              SHA256

              8bfa30c18c019101ce7b848a428994dfdc4d925db3276bbb6d541fa55e4802fd

              SHA512

              9651b4eb6eac841228818aa2ab17c2a76640c1a46f686953f83476489f8e390baa9b5b4a0d28ae4a99cc6f8384ed977bb38cf41ab50df08608a7f62d39851176

            • C:\Users\Admin\AppData\Local\78c09df400ba7309548c26aa73a1ee26\Admin@CFZMTHEF_en-US\System\Debug.txt

              Filesize

              1KB

              MD5

              a0ff51f24c8f2636e04b6143cb6bb605

              SHA1

              34fb946a36582cb758e5a6884e131fc04b16397a

              SHA256

              00d610daad65358380ddc0e8bf8452b8ab63eafdd59a2b37154ce92016d1c402

              SHA512

              1b4043a73869f4b9bdfa3068c32b66be163d50247e7264a98a97be885c36e0a4630594ab5dffcec302b8728850bf205b6acd9d37365a21e0705542acc6694fd5

            • C:\Users\Admin\AppData\Local\78c09df400ba7309548c26aa73a1ee26\Admin@CFZMTHEF_en-US\System\Process.txt

              Filesize

              4KB

              MD5

              0cb1b94f6a35dddc4b35b9f198aa7e59

              SHA1

              dc36fc08a8d31e9e7b6b8830a0fc2e0f466b6507

              SHA256

              dcd3b2bc155effae6415c52f4e37c46e6ad665f63a1e372065d565539ba6fa8c

              SHA512

              643c9216f3cf690b1e8dd57c8fa31bdcb438286ff7444b404af687925b6a1f849a5d3781a91943574c1e4b42e997e1bfac959840102d1e4fada1b865db4241b8

            • C:\Users\Admin\AppData\Local\78c09df400ba7309548c26aa73a1ee26\Admin@CFZMTHEF_en-US\System\ProductKey.txt

              Filesize

              29B

              MD5

              71eb5479298c7afc6d126fa04d2a9bde

              SHA1

              a9b3d5505cf9f84bb6c2be2acece53cb40075113

              SHA256

              f6cadfd4e4c25ff3b8cffe54a2af24a757a349abbf4e1142ec4c9789347fe8b3

              SHA512

              7c6687e21d31ec1d6d2eff04b07b465f875fd80df26677f1506b14158444cf55044eb6674880bd5bd44f04ff73023b26cb19b8837427a1d6655c96df52f140bd

            • C:\Users\Admin\AppData\Local\78c09df400ba7309548c26aa73a1ee26\msgid.dat

              Filesize

              19B

              MD5

              75e5a3421bad6f4801b50d5d643567c3

              SHA1

              a1d5400a9851d133a6a46a57fe786d818f5f8999

              SHA256

              7e506d8e40b15bcbeac88ffdb26f147e1c0ea423f0e082ec77ce739006367fdf

              SHA512

              4ffd5f4be4fb4a89978ca4deca640b6dc7bd7af3e7fccb2ee96558a588ef2149f9cd915f426eeafbbf04902a214c5fe5c25c6ccfab8a8838de06f8f26792e6c1

            • memory/4756-271-0x0000000000D10000-0x0000000000D20000-memory.dmp

              Filesize

              64KB

            • memory/4756-242-0x0000000008940000-0x0000000008C90000-memory.dmp

              Filesize

              3.3MB

            • memory/4756-54-0x0000000006850000-0x00000000068E2000-memory.dmp

              Filesize

              584KB

            • memory/4756-59-0x0000000007040000-0x000000000753E000-memory.dmp

              Filesize

              5.0MB

            • memory/4756-12-0x00000000061E0000-0x00000000061FE000-memory.dmp

              Filesize

              120KB

            • memory/4756-139-0x0000000000D10000-0x0000000000D20000-memory.dmp

              Filesize

              64KB

            • memory/4756-11-0x00000000061C0000-0x00000000061C8000-memory.dmp

              Filesize

              32KB

            • memory/4756-165-0x00000000062E0000-0x000000000635A000-memory.dmp

              Filesize

              488KB

            • memory/4756-1-0x0000000073930000-0x000000007401E000-memory.dmp

              Filesize

              6.9MB

            • memory/4756-10-0x00000000061B0000-0x00000000061BA000-memory.dmp

              Filesize

              40KB

            • memory/4756-9-0x00000000052F0000-0x00000000052F8000-memory.dmp

              Filesize

              32KB

            • memory/4756-2-0x0000000004CD0000-0x0000000004D36000-memory.dmp

              Filesize

              408KB

            • memory/4756-3-0x0000000000D10000-0x0000000000D20000-memory.dmp

              Filesize

              64KB

            • memory/4756-8-0x00000000052C0000-0x00000000052E6000-memory.dmp

              Filesize

              152KB

            • memory/4756-241-0x0000000002740000-0x0000000002762000-memory.dmp

              Filesize

              136KB

            • memory/4756-0-0x0000000000320000-0x00000000004B2000-memory.dmp

              Filesize

              1.6MB

            • memory/4756-246-0x0000000073930000-0x000000007401E000-memory.dmp

              Filesize

              6.9MB

            • memory/4756-247-0x0000000000D10000-0x0000000000D20000-memory.dmp

              Filesize

              64KB

            • memory/4756-234-0x0000000006720000-0x00000000067D2000-memory.dmp

              Filesize

              712KB

            • memory/4756-258-0x00000000063E0000-0x00000000063EA000-memory.dmp

              Filesize

              40KB

            • memory/4756-259-0x0000000000D10000-0x0000000000D20000-memory.dmp

              Filesize

              64KB

            • memory/4756-263-0x0000000000D10000-0x0000000000D20000-memory.dmp

              Filesize

              64KB

            • memory/4756-264-0x0000000000D10000-0x0000000000D20000-memory.dmp

              Filesize

              64KB

            • memory/4756-265-0x0000000000D10000-0x0000000000D20000-memory.dmp

              Filesize

              64KB

            • memory/4756-266-0x0000000000D10000-0x0000000000D20000-memory.dmp

              Filesize

              64KB

            • memory/4756-267-0x0000000000D10000-0x0000000000D20000-memory.dmp

              Filesize

              64KB

            • memory/4756-268-0x0000000000D10000-0x0000000000D20000-memory.dmp

              Filesize

              64KB

            • memory/4756-269-0x0000000000D10000-0x0000000000D20000-memory.dmp

              Filesize

              64KB

            • memory/4756-270-0x0000000000D10000-0x0000000000D20000-memory.dmp

              Filesize

              64KB

            • memory/4756-7-0x0000000005230000-0x00000000052C2000-memory.dmp

              Filesize

              584KB

            • memory/4756-272-0x0000000000D10000-0x0000000000D20000-memory.dmp

              Filesize

              64KB