Analysis

  • max time kernel
    60s
  • max time network
    73s
  • platform
    windows10-1703_x64
  • resource
    win10-20231020-en
  • resource tags

    arch:x64arch:x86image:win10-20231020-enlocale:en-usos:windows10-1703-x64system
  • submitted
    09-11-2023 03:19

General

  • Target

    http://mahamanthralayam.com/.well-known/acme-challenge/set.html

Malware Config

Extracted

Family

kutaki

C2

http://treysbeatend.com/laptop/squared.php

http://terebinnahicc.club/sec/kool.txt

Signatures

  • Kutaki

    Information stealer and keylogger that hides inside legitimate Visual Basic applications.

  • Drops startup file 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Enumerates system info in registry 2 TTPs 3 IoCs
  • Modifies data under HKEY_USERS 2 IoCs
  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 42 IoCs
  • Suspicious use of SendNotifyMessage 24 IoCs
  • Suspicious use of SetWindowsHookEx 6 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Program Files\Google\Chrome\Application\chrome.exe
    "C:\Program Files\Google\Chrome\Application\chrome.exe" --disable-background-networking --disable-component-update --simulate-outdated-no-au='Tue, 31 Dec 2099 23:59:59 GMT' --single-argument http://mahamanthralayam.com/.well-known/acme-challenge/set.html
    1⤵
    • Enumerates system info in registry
    • Modifies data under HKEY_USERS
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    • Suspicious use of WriteProcessMemory
    PID:4788
    • 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=0xcc,0xd0,0xd4,0xa8,0xd8,0x7ffb3c359758,0x7ffb3c359768,0x7ffb3c359778
      2⤵
        PID:4732
      • 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=1784 --field-trial-handle=1844,i,3053021475774749260,17859343623873377180,131072 /prefetch:8
        2⤵
          PID:4208
        • 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=2100 --field-trial-handle=1844,i,3053021475774749260,17859343623873377180,131072 /prefetch:8
          2⤵
            PID:3104
          • 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=4 --enable-main-frame-before-activation --renderer-client-id=5 --mojo-platform-channel-handle=2668 --field-trial-handle=1844,i,3053021475774749260,17859343623873377180,131072 /prefetch:1
            2⤵
              PID:1040
            • 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=4 --enable-main-frame-before-activation --renderer-client-id=6 --mojo-platform-channel-handle=2656 --field-trial-handle=1844,i,3053021475774749260,17859343623873377180,131072 /prefetch:1
              2⤵
                PID:3424
              • 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=1540 --field-trial-handle=1844,i,3053021475774749260,17859343623873377180,131072 /prefetch:2
                2⤵
                  PID:4416
                • 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=4 --enable-main-frame-before-activation --renderer-client-id=7 --mojo-platform-channel-handle=3580 --field-trial-handle=1844,i,3053021475774749260,17859343623873377180,131072 /prefetch:1
                  2⤵
                    PID:4828
                  • C:\Program Files\Google\Chrome\Application\chrome.exe
                    "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=chrome.mojom.ProcessorMetrics --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=4820 --field-trial-handle=1844,i,3053021475774749260,17859343623873377180,131072 /prefetch:8
                    2⤵
                      PID:528
                    • C:\Program Files\Google\Chrome\Application\chrome.exe
                      "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=chrome.mojom.UtilWin --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=4848 --field-trial-handle=1844,i,3053021475774749260,17859343623873377180,131072 /prefetch:8
                      2⤵
                        PID:4616
                      • C:\Program Files\Google\Chrome\Application\chrome.exe
                        "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=quarantine.mojom.Quarantine --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=5252 --field-trial-handle=1844,i,3053021475774749260,17859343623873377180,131072 /prefetch:8
                        2⤵
                          PID:3492
                      • 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:3940
                        • C:\Windows\System32\rundll32.exe
                          C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
                          1⤵
                            PID:3200
                          • C:\Users\Admin\AppData\Local\Temp\Temp2_INF_NEFT_20231109.zip\INF_NEFT_20231109.cmd
                            "C:\Users\Admin\AppData\Local\Temp\Temp2_INF_NEFT_20231109.zip\INF_NEFT_20231109.cmd"
                            1⤵
                            • Drops startup file
                            • Suspicious use of SetWindowsHookEx
                            PID:596
                            • C:\Windows\SysWOW64\cmd.exe
                              cmd.exe /c C:\Users\Admin\AppData\Local\Temp\
                              2⤵
                                PID:4088
                              • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\xdlkngfk.exe
                                "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\xdlkngfk.exe"
                                2⤵
                                • Executes dropped EXE
                                • Suspicious use of SetWindowsHookEx
                                PID:3204

                            Network

                            MITRE ATT&CK Enterprise v15

                            Replay Monitor

                            Loading Replay Monitor...

                            Downloads

                            • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences

                              Filesize

                              5KB

                              MD5

                              d624a8b753e0b761c1d68038fc031909

                              SHA1

                              833af95d07488c48c984a08048e9e53733bc7a8b

                              SHA256

                              2b1fa7e3e8bb12e5118422467af6c232483ab49829fda49b2ea53005b476b10e

                              SHA512

                              b032ff58ec5c8e93a522780d688fbbfcd948f56cb3f398fe66f70100661f381414fd3f59d82f4dc7ce81a0d1c8c39f1bdb8a8fe94ec2de07340a19bdf8898dee

                            • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences

                              Filesize

                              6KB

                              MD5

                              fb1941273257f9afaf10f575634f30f1

                              SHA1

                              3f3c92dd16719b68f3628d719ec9e9f8cb78d5b2

                              SHA256

                              1763a0023b4e318a8cc5dfe0d5ab603ba0bf3d1db92bcdac0e1c82758c1d99c7

                              SHA512

                              aea7b4d22008b94a03b7c57e76984dbeff62966960faeac9fb4e8a930bb9abfe53ebda759ae82d7e09e20b819b95f18721c99ac824db8cb5340cc955f34e8f12

                            • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Local State

                              Filesize

                              106KB

                              MD5

                              aba6cc3efb04fbd90a7a0f8b83d9a7ad

                              SHA1

                              d5caebe9f7808d5aa4fde6aa398d517cdb33dab0

                              SHA256

                              c61db510b93c4f015a6be90f7072cac0c15083794020cc64e43c52707437c76f

                              SHA512

                              47de30703bf1e5fd4be79cc20c998bf0e5d471cce858454aafc82d63b6c6e018e603dec58e1f1cbc3552f59b491fded87fcdcd6d53b2259fe0dfd30f62e2d890

                            • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\persisted_first_party_sets.json

                              Filesize

                              2B

                              MD5

                              99914b932bd37a50b983c5e7c90ae93b

                              SHA1

                              bf21a9e8fbc5a3846fb05b4fa0859e0917b2202f

                              SHA256

                              44136fa355b3678a1146ad16f7e8649e94fb4fc21fe77e8310c060f61caaff8a

                              SHA512

                              27c74670adb75075fad058d5ceaf7b20c4e7786c83bae8a32f626f9782af34c9a33c2046ef60fd2a7878d378e29fec851806bbd9a67878f3a9f1cda4830763fd

                            • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\xdlkngfk.exe

                              Filesize

                              3.0MB

                              MD5

                              344c418bcf8858a42dfa36ac4144b1da

                              SHA1

                              71f4413340076f0b94a425f942eb2eda2788a12e

                              SHA256

                              42ad2feffba66cb55b1ecc62929ce244c25d8f53db277a763cce09e6c36fea42

                              SHA512

                              aa652b8c71af0c5b3118d469ec82ff16de6f6044d33c66de602bd78cb70f4abc9d4f0535b83a7198015b2e4ad6b8be41f3156fcc57ec3481debb551ab0750132

                            • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\xdlkngfk.exe

                              Filesize

                              3.0MB

                              MD5

                              344c418bcf8858a42dfa36ac4144b1da

                              SHA1

                              71f4413340076f0b94a425f942eb2eda2788a12e

                              SHA256

                              42ad2feffba66cb55b1ecc62929ce244c25d8f53db277a763cce09e6c36fea42

                              SHA512

                              aa652b8c71af0c5b3118d469ec82ff16de6f6044d33c66de602bd78cb70f4abc9d4f0535b83a7198015b2e4ad6b8be41f3156fcc57ec3481debb551ab0750132

                            • C:\Users\Admin\Downloads\INF_NEFT_20231109.zip

                              Filesize

                              2.1MB

                              MD5

                              c6424920411c813828d36e6c9fb76212

                              SHA1

                              dbdbd44ae0184458e4427e21af1a2e36b1d2047f

                              SHA256

                              c0358e8666c3e61d72f7aee96caaadcff558c70698708d259e065fd22e34559d

                              SHA512

                              e98b4d85dabcdf32db9287cf53aaa33db6f114282a6ba55d20afeba938e6a54b55d61d2f87f1e3656b111fcad923890f580ca4994cfcb0f1e28c19c402dde832

                            • \??\pipe\crashpad_4788_GPYTYOKEACARPMUK

                              MD5

                              d41d8cd98f00b204e9800998ecf8427e

                              SHA1

                              da39a3ee5e6b4b0d3255bfef95601890afd80709

                              SHA256

                              e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

                              SHA512

                              cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e