Resubmissions

02-02-2023 16:10

230202-tmlnmaag4s 10

02-02-2023 13:42

230202-qz69bacd7v 10

Analysis

  • max time kernel
    151s
  • max time network
    115s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    02-02-2023 16:10

General

  • Target

    PerX.exe

  • Size

    700KB

  • MD5

    2a1a572771597d924ed145efaf4c77d6

  • SHA1

    0302a5986fadc56557018291003a2bc852fd0913

  • SHA256

    333ea334c1a637d1ef888771bf6542953d28f76c26487356ff2a94a971667c55

  • SHA512

    17560878ae608fe947220f0d640d72d51e7c607e238e8be7b9f19fc7d20a7dd631633c21f424629bb8f57963161d8226601308cf95ced86c7c178b64dd0302fc

  • SSDEEP

    12288:Ddm3xc4L24cmoS8c97WyggbpPYfBZpLnPO2Vmi1ZXA2m/jl+mixj2:Ddm3xX9ggbpcLP7A2gomOC

Malware Config

Extracted

Family

sality

C2

http://89.119.67.154/testo5/

http://kukutrustnet777.info/home.gif

http://kukutrustnet888.info/home.gif

http://kukutrustnet987.info/home.gif

http://www.klkjwre9fqwieluoi.info/

http://kukutrustnet777888.info/

Signatures

  • Modifies firewall policy service 2 TTPs 3 IoCs
  • Sality

    Sality is backdoor written in C++, first discovered in 2003.

  • UAC bypass 3 TTPs 1 IoCs
  • Windows security bypass 2 TTPs 6 IoCs
  • Executes dropped EXE 1 IoCs
  • UPX packed file 5 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Windows security modification 2 TTPs 7 IoCs
  • Checks whether UAC is enabled 1 TTPs 1 IoCs
  • Enumerates connected drives 3 TTPs 22 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Drops autorun.inf file 1 TTPs 1 IoCs

    Malware can abuse Windows Autorun to spread further via attached volumes.

  • Drops file in Program Files directory 11 IoCs
  • Drops file in Windows directory 1 IoCs
  • Program crash 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs
  • System policy modification 1 TTPs 1 IoCs

Processes

  • C:\Windows\system32\fontdrvhost.exe
    "fontdrvhost.exe"
    1⤵
      PID:776
    • C:\Windows\System32\RuntimeBroker.exe
      C:\Windows\System32\RuntimeBroker.exe -Embedding
      1⤵
        PID:3444
      • C:\Windows\System32\RuntimeBroker.exe
        C:\Windows\System32\RuntimeBroker.exe -Embedding
        1⤵
          PID:3700
        • C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe
          "C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe" -ServerName:CortanaUI.AppX8z9r6jm96hw4bsbneegw0kyxx296wr9t.mca
          1⤵
            PID:3532
          • C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe
            "C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca
            1⤵
              PID:3376
            • C:\Windows\system32\DllHost.exe
              C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
              1⤵
                PID:3276
              • C:\Windows\system32\svchost.exe
                C:\Windows\system32\svchost.exe -k ClipboardSvcGroup -p -s cbdhsvc
                1⤵
                  PID:2936
                • C:\Windows\Explorer.EXE
                  C:\Windows\Explorer.EXE
                  1⤵
                    PID:2376
                    • C:\Users\Admin\AppData\Local\Temp\PerX.exe
                      "C:\Users\Admin\AppData\Local\Temp\PerX.exe"
                      2⤵
                      • Modifies firewall policy service
                      • UAC bypass
                      • Windows security bypass
                      • Windows security modification
                      • Checks whether UAC is enabled
                      • Enumerates connected drives
                      • Drops autorun.inf file
                      • Drops file in Program Files directory
                      • Drops file in Windows directory
                      • Suspicious behavior: EnumeratesProcesses
                      • Suspicious use of AdjustPrivilegeToken
                      • Suspicious use of WriteProcessMemory
                      • System policy modification
                      PID:3916
                      • C:\Users\Admin\AppData\Local\Temp\PerXmgr.exe
                        C:\Users\Admin\AppData\Local\Temp\PerXmgr.exe
                        3⤵
                        • Executes dropped EXE
                        PID:5072
                        • C:\Windows\SysWOW64\WerFault.exe
                          C:\Windows\SysWOW64\WerFault.exe -u -p 5072 -s 444
                          4⤵
                          • Program crash
                          PID:4532
                  • C:\Windows\system32\taskhostw.exe
                    taskhostw.exe {222A245B-E637-4AE9-A93F-A59CA119A75E}
                    1⤵
                      PID:2868
                    • C:\Windows\system32\svchost.exe
                      C:\Windows\system32\svchost.exe -k UnistackSvcGroup -s CDPUserSvc
                      1⤵
                        PID:2816
                      • C:\Windows\system32\sihost.exe
                        sihost.exe
                        1⤵
                          PID:2700
                        • C:\Windows\system32\dwm.exe
                          "dwm.exe"
                          1⤵
                            PID:1016
                          • C:\Windows\system32\fontdrvhost.exe
                            "fontdrvhost.exe"
                            1⤵
                              PID:784
                            • C:\Windows\SysWOW64\WerFault.exe
                              C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 5072 -ip 5072
                              1⤵
                                PID:3328

                              Network

                              MITRE ATT&CK Matrix ATT&CK v6

                              Initial Access

                              Replication Through Removable Media

                              1
                              T1091

                              Persistence

                              Modify Existing Service

                              1
                              T1031

                              Privilege Escalation

                              Bypass User Account Control

                              1
                              T1088

                              Defense Evasion

                              Modify Registry

                              5
                              T1112

                              Bypass User Account Control

                              1
                              T1088

                              Disabling Security Tools

                              3
                              T1089

                              Discovery

                              System Information Discovery

                              2
                              T1082

                              Query Registry

                              1
                              T1012

                              Peripheral Device Discovery

                              1
                              T1120

                              Lateral Movement

                              Replication Through Removable Media

                              1
                              T1091

                              Replay Monitor

                              Loading Replay Monitor...

                              Downloads

                              • C:\Users\Admin\AppData\Local\Temp\PerXmgr.exe
                                Filesize

                                113KB

                                MD5

                                d26092af969610dab56e02649ecae88d

                                SHA1

                                cd450ff4b645acd188fa1f9e9c16a972c0e99f87

                                SHA256

                                e4fedb771fd949517cbf3392c9f36be599bf16726a4702cb960a1f4845c39a71

                                SHA512

                                8c87bf4318089dc03d7c60b1d1f04ac46333f792ca37bd3a0ca832dc22ae56dc8b0a473154706ef58812c70cf99d6fee877ab4984ce973eaaa3e5d1525730b05

                              • C:\Users\Admin\AppData\Local\Temp\PerXmgr.exe
                                Filesize

                                113KB

                                MD5

                                d26092af969610dab56e02649ecae88d

                                SHA1

                                cd450ff4b645acd188fa1f9e9c16a972c0e99f87

                                SHA256

                                e4fedb771fd949517cbf3392c9f36be599bf16726a4702cb960a1f4845c39a71

                                SHA512

                                8c87bf4318089dc03d7c60b1d1f04ac46333f792ca37bd3a0ca832dc22ae56dc8b0a473154706ef58812c70cf99d6fee877ab4984ce973eaaa3e5d1525730b05

                              • memory/3916-132-0x0000000000400000-0x0000000000531000-memory.dmp
                                Filesize

                                1.2MB

                              • memory/3916-136-0x0000000002420000-0x00000000034AE000-memory.dmp
                                Filesize

                                16.6MB

                              • memory/3916-137-0x0000000002420000-0x00000000034AE000-memory.dmp
                                Filesize

                                16.6MB

                              • memory/3916-138-0x0000000000400000-0x0000000000531000-memory.dmp
                                Filesize

                                1.2MB

                              • memory/3916-139-0x0000000002420000-0x00000000034AE000-memory.dmp
                                Filesize

                                16.6MB

                              • memory/5072-133-0x0000000000000000-mapping.dmp