Analysis

  • max time kernel
    141s
  • max time network
    148s
  • platform
    windows7_x64
  • resource
    win7-20230220-en
  • resource tags

    arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system
  • submitted
    23-03-2023 17:01

General

  • Target

    AsyncClient.exe

  • Size

    45KB

  • MD5

    396113eb702441f9d4377425caa87188

  • SHA1

    cdb100adec115eab8239f8d14da3ea3e64c1570c

  • SHA256

    ec93adc0594e2c2fb8360d594d434bd5a217f2fb7d4184e086220fcae3886c9f

  • SHA512

    daf3c73adbde89d21b4928a541712843d9423c355a74013ac222df3d08f763862f31e31a1e110d683d063f2ce7b208dd6c64d4665a4f088c001d68d0fcf1b34e

  • SSDEEP

    768:LudbM1T1fzFPWUDCytmo2qIWKjGKG6PIyzjbFgX3i89bccImEpJp8Mf2uFd0BDZV:LudbM1T1b12qKYDy3bCXS8JcBTpJiuF4

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

COM Surrogate

C2

127.0.0.1:6606

127.0.0.1:7707

127.0.0.1:8808

127.0.0.1:1604

127.0.0.1:14576

127.0.0.1:15074

127.0.0.1:15018

4.tcp.eu.ngrok.io:6606

4.tcp.eu.ngrok.io:7707

4.tcp.eu.ngrok.io:8808

4.tcp.eu.ngrok.io:1604

4.tcp.eu.ngrok.io:14576

4.tcp.eu.ngrok.io:15074

4.tcp.eu.ngrok.io:15018

7.tcp.eu.ngrok.io:6606

7.tcp.eu.ngrok.io:7707

7.tcp.eu.ngrok.io:8808

7.tcp.eu.ngrok.io:1604

7.tcp.eu.ngrok.io:14576

7.tcp.eu.ngrok.io:15074

Mutex

COM Surrogate

Attributes
  • delay

    3

  • install

    true

  • install_file

    Microsoftfixer.exe

  • install_folder

    %AppData%

aes.plain

Signatures

  • AsyncRat

    AsyncRAT is designed to remotely monitor and control other computers written in C#.

  • Async RAT payload 7 IoCs
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 1 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Delays execution with timeout.exe 1 IoCs
  • Enumerates system info in registry 2 TTPs 3 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of FindShellTrayWindow 34 IoCs
  • Suspicious use of SendNotifyMessage 32 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
    "C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1704
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Microsoftfixer" /tr '"C:\Users\Admin\AppData\Roaming\Microsoftfixer.exe"' & exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1844
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "Microsoftfixer" /tr '"C:\Users\Admin\AppData\Roaming\Microsoftfixer.exe"'
        3⤵
        • Creates scheduled task(s)
        PID:904
    • C:\Windows\SysWOW64\cmd.exe
      cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp18CF.tmp.bat""
      2⤵
      • Loads dropped DLL
      • Suspicious use of WriteProcessMemory
      PID:1244
      • C:\Windows\SysWOW64\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:1784
      • C:\Users\Admin\AppData\Roaming\Microsoftfixer.exe
        "C:\Users\Admin\AppData\Roaming\Microsoftfixer.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious behavior: AddClipboardFormatListener
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of SetWindowsHookEx
        PID:1692
  • C:\Program Files\Google\Chrome\Application\chrome.exe
    "C:\Program Files\Google\Chrome\Application\chrome.exe"
    1⤵
    • Enumerates system info in registry
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    • Suspicious use of WriteProcessMemory
    PID:1580
    • C:\Program Files\Google\Chrome\Application\chrome.exe
      "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=crashpad-handler "--user-data-dir=C:\Users\Admin\AppData\Local\Google\Chrome\User Data" /prefetch:7 --monitor-self-annotation=ptype=crashpad-handler "--database=C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Crashpad" "--metrics-dir=C:\Users\Admin\AppData\Local\Google\Chrome\User Data" --url=https://clients2.google.com/cr/report --annotation=channel= --annotation=plat=Win64 --annotation=prod=Chrome --annotation=ver=106.0.5249.119 --initial-client-data=0xc0,0xc4,0xc8,0x94,0xcc,0x7fef6839758,0x7fef6839768,0x7fef6839778
      2⤵
        PID:1320
      • C:\Program Files\Google\Chrome\Application\chrome.exe
        "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=gpu-process --gpu-preferences=UAAAAAAAAADgAAAYAAAAAAAAAAAAAAAAAABgAAAAAAAwAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAEgAAAAAAAAASAAAAAAAAAAYAAAAAgAAABAAAAAAAAAAGAAAAAAAAAAQAAAAAAAAAAAAAAAOAAAAEAAAAAAAAAABAAAADgAAAAgAAAAAAAAACAAAAAAAAAA= --mojo-platform-channel-handle=1092 --field-trial-handle=1236,i,2163210737163128660,11522937950111101458,131072 /prefetch:2
        2⤵
          PID:1100
        • C:\Program Files\Google\Chrome\Application\chrome.exe
          "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=1512 --field-trial-handle=1236,i,2163210737163128660,11522937950111101458,131072 /prefetch:8
          2⤵
            PID:876
          • C:\Program Files\Google\Chrome\Application\chrome.exe
            "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=storage.mojom.StorageService --lang=en-US --service-sandbox-type=utility --mojo-platform-channel-handle=1660 --field-trial-handle=1236,i,2163210737163128660,11522937950111101458,131072 /prefetch:8
            2⤵
              PID:1880
            • C:\Program Files\Google\Chrome\Application\chrome.exe
              "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --display-capture-permissions-policy-allowed --enable-chrome-cart --lang=en-US --device-scale-factor=1 --num-raster-threads=2 --enable-main-frame-before-activation --renderer-client-id=5 --mojo-platform-channel-handle=2288 --field-trial-handle=1236,i,2163210737163128660,11522937950111101458,131072 /prefetch:1
              2⤵
                PID:828
              • C:\Program Files\Google\Chrome\Application\chrome.exe
                "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --display-capture-permissions-policy-allowed --enable-chrome-cart --first-renderer-process --lang=en-US --device-scale-factor=1 --num-raster-threads=2 --enable-main-frame-before-activation --renderer-client-id=6 --mojo-platform-channel-handle=2276 --field-trial-handle=1236,i,2163210737163128660,11522937950111101458,131072 /prefetch:1
                2⤵
                  PID:1844
                • C:\Program Files\Google\Chrome\Application\chrome.exe
                  "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=gpu-process --gpu-preferences=UAAAAAAAAADgAAAYAAAAAAAAAAAAAAAAAABgAAAAAAAwAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAEgAAAAAAAAASAAAAAAAAAAYAAAAAgAAABAAAAAAAAAAGAAAAAAAAAAQAAAAAAAAAAAAAAAOAAAAEAAAAAAAAAABAAAADgAAAAgAAAAAAAAACAAAAAAAAAA= --mojo-platform-channel-handle=3220 --field-trial-handle=1236,i,2163210737163128660,11522937950111101458,131072 /prefetch:2
                  2⤵
                    PID:2240
                • C:\Program Files\Google\Chrome\Application\106.0.5249.119\elevation_service.exe
                  "C:\Program Files\Google\Chrome\Application\106.0.5249.119\elevation_service.exe"
                  1⤵
                    PID:1244

                  Network

                  MITRE ATT&CK Matrix ATT&CK v6

                  Execution

                  Scheduled Task

                  1
                  T1053

                  Persistence

                  Scheduled Task

                  1
                  T1053

                  Privilege Escalation

                  Scheduled Task

                  1
                  T1053

                  Discovery

                  System Information Discovery

                  2
                  T1082

                  Query Registry

                  1
                  T1012

                  Command and Control

                  Web Service

                  1
                  T1102

                  Replay Monitor

                  Loading Replay Monitor...

                  Downloads

                  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015
                    Filesize

                    61KB

                    MD5

                    e71c8443ae0bc2e282c73faead0a6dd3

                    SHA1

                    0c110c1b01e68edfacaeae64781a37b1995fa94b

                    SHA256

                    95b0a5acc5bf70d3abdfd091d0c9f9063aa4fde65bd34dbf16786082e1992e72

                    SHA512

                    b38458c7fa2825afb72794f374827403d5946b1132e136a0ce075dfd351277cf7d957c88dc8a1e4adc3bcae1fa8010dae3831e268e910d517691de24326391a6

                  • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\GPUCache\data_1
                    Filesize

                    264KB

                    MD5

                    f50f89a0a91564d0b8a211f8921aa7de

                    SHA1

                    112403a17dd69d5b9018b8cede023cb3b54eab7d

                    SHA256

                    b1e963d702392fb7224786e7d56d43973e9b9efd1b89c17814d7c558ffc0cdec

                    SHA512

                    bf8cda48cf1ec4e73f0dd1d4fa5562af1836120214edb74957430cd3e4a2783e801fa3f4ed2afb375257caeed4abe958265237d6e0aacf35a9ede7a2e8898d58

                  • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Site Characteristics Database\000004.dbtmp
                    Filesize

                    16B

                    MD5

                    6752a1d65b201c13b62ea44016eb221f

                    SHA1

                    58ecf154d01a62233ed7fb494ace3c3d4ffce08b

                    SHA256

                    0861415cada612ea5834d56e2cf1055d3e63979b69eb71d32ae9ae394d8306cd

                    SHA512

                    9cfd838d3fb570b44fc3461623ab2296123404c6c8f576b0de0aabd9a6020840d4c9125eb679ed384170dbcaac2fa30dc7fa9ee5b77d6df7c344a0aa030e0389

                  • C:\Users\Admin\AppData\Local\Temp\Tar1389.tmp
                    Filesize

                    161KB

                    MD5

                    be2bec6e8c5653136d3e72fe53c98aa3

                    SHA1

                    a8182d6db17c14671c3d5766c72e58d87c0810de

                    SHA256

                    1919aab2a820642490169bdc4e88bd1189e22f83e7498bf8ebdfb62ec7d843fd

                    SHA512

                    0d1424ccdf0d53faf3f4e13d534e12f22388648aa4c23edbc503801e3c96b7f73c7999b760b5bef4b5e9dd923dffe21a21889b1ce836dd428420bf0f4f5327ff

                  • C:\Users\Admin\AppData\Local\Temp\tmp18CF.tmp.bat
                    Filesize

                    158B

                    MD5

                    77b0070d827e1b9017616bd5f4cd1c70

                    SHA1

                    710952c35c63cab39596e869a41e0296eb7666c7

                    SHA256

                    8fa52ccff55f4a5d1b411e6fe919d5e1597c48150285e62e9b2251766d565bb7

                    SHA512

                    967a39770caf782d35d40e280467c1c24f6b6fcad61f19e73eb89ec3ab76daa155a340a44b2b841f70228a430e3ab3f6708ef71ef6fb722999eb83117f79971c

                  • C:\Users\Admin\AppData\Local\Temp\tmp18CF.tmp.bat
                    Filesize

                    158B

                    MD5

                    77b0070d827e1b9017616bd5f4cd1c70

                    SHA1

                    710952c35c63cab39596e869a41e0296eb7666c7

                    SHA256

                    8fa52ccff55f4a5d1b411e6fe919d5e1597c48150285e62e9b2251766d565bb7

                    SHA512

                    967a39770caf782d35d40e280467c1c24f6b6fcad61f19e73eb89ec3ab76daa155a340a44b2b841f70228a430e3ab3f6708ef71ef6fb722999eb83117f79971c

                  • C:\Users\Admin\AppData\Roaming\Microsoftfixer.exe
                    Filesize

                    45KB

                    MD5

                    396113eb702441f9d4377425caa87188

                    SHA1

                    cdb100adec115eab8239f8d14da3ea3e64c1570c

                    SHA256

                    ec93adc0594e2c2fb8360d594d434bd5a217f2fb7d4184e086220fcae3886c9f

                    SHA512

                    daf3c73adbde89d21b4928a541712843d9423c355a74013ac222df3d08f763862f31e31a1e110d683d063f2ce7b208dd6c64d4665a4f088c001d68d0fcf1b34e

                  • C:\Users\Admin\AppData\Roaming\Microsoftfixer.exe
                    Filesize

                    45KB

                    MD5

                    396113eb702441f9d4377425caa87188

                    SHA1

                    cdb100adec115eab8239f8d14da3ea3e64c1570c

                    SHA256

                    ec93adc0594e2c2fb8360d594d434bd5a217f2fb7d4184e086220fcae3886c9f

                    SHA512

                    daf3c73adbde89d21b4928a541712843d9423c355a74013ac222df3d08f763862f31e31a1e110d683d063f2ce7b208dd6c64d4665a4f088c001d68d0fcf1b34e

                  • \??\PIPE\samr
                    MD5

                    d41d8cd98f00b204e9800998ecf8427e

                    SHA1

                    da39a3ee5e6b4b0d3255bfef95601890afd80709

                    SHA256

                    e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

                    SHA512

                    cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

                  • \??\pipe\crashpad_1580_EZURTPIFPDVWBOPL
                    MD5

                    d41d8cd98f00b204e9800998ecf8427e

                    SHA1

                    da39a3ee5e6b4b0d3255bfef95601890afd80709

                    SHA256

                    e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

                    SHA512

                    cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

                  • \Users\Admin\AppData\Roaming\Microsoftfixer.exe
                    Filesize

                    45KB

                    MD5

                    396113eb702441f9d4377425caa87188

                    SHA1

                    cdb100adec115eab8239f8d14da3ea3e64c1570c

                    SHA256

                    ec93adc0594e2c2fb8360d594d434bd5a217f2fb7d4184e086220fcae3886c9f

                    SHA512

                    daf3c73adbde89d21b4928a541712843d9423c355a74013ac222df3d08f763862f31e31a1e110d683d063f2ce7b208dd6c64d4665a4f088c001d68d0fcf1b34e

                  • memory/1692-88-0x0000000000540000-0x0000000000562000-memory.dmp
                    Filesize

                    136KB

                  • memory/1692-110-0x0000000000AE0000-0x0000000000B20000-memory.dmp
                    Filesize

                    256KB

                  • memory/1692-111-0x0000000000AE0000-0x0000000000B20000-memory.dmp
                    Filesize

                    256KB

                  • memory/1692-112-0x0000000000B20000-0x0000000000B42000-memory.dmp
                    Filesize

                    136KB

                  • memory/1692-70-0x0000000000AE0000-0x0000000000B20000-memory.dmp
                    Filesize

                    256KB

                  • memory/1692-69-0x0000000000AE0000-0x0000000000B20000-memory.dmp
                    Filesize

                    256KB

                  • memory/1692-68-0x0000000001270000-0x0000000001282000-memory.dmp
                    Filesize

                    72KB

                  • memory/1704-54-0x00000000000B0000-0x00000000000C2000-memory.dmp
                    Filesize

                    72KB

                  • memory/1704-55-0x0000000004DA0000-0x0000000004DE0000-memory.dmp
                    Filesize

                    256KB