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Analysis

  • max time kernel
    51s
  • max time network
    53s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/12/2024, 04:57

General

  • Target

    system32.dll.exe

  • Size

    11.7MB

  • MD5

    61436a5727d36c7e874181a08ae69b2e

  • SHA1

    a8622ec1b7bf5fd040bc1768133c8ee2c8e79acc

  • SHA256

    251d4a1307fb42d38c24b58f534a06906d0a89ef6f11daf625d9e2feaccb5ca5

  • SHA512

    ca4072766b860ac8216ecbd905b25139ad8ef7ac3222e0ca99ef38d39cc4a6b96e43a77a5d11f2b3fc21723bbdf79931fe5417864c43ad2a2a2286a89a1a1b3c

  • SSDEEP

    196608:bgjFnMsTXsvnox3g6W+QRO+KU8oTtoS3darE/W5FfUF/Z0RUSDBD9DsyKJbtYxn:UxnMsTXsvoRgX+joZB7+fk/rkBebSn

Malware Config

Extracted

Family

gurcu

C2

https://api.telegram.org/bot8137934554:AAFOeSb9oJjQx7sEfNVTiItYJefxeHOSueA/sendDocument?chat_id=-4683258951&caption=%F0%9F%93%82%20-%20Browser%20data%0A%E2%94%9C%E2%94%80%E2%94%80%20%F0%9F%93%82%20-%20cookies(0.25%20kb

https://api.telegram.org/bot8137934554:AAFOeSb9oJjQx7sEfNVTiItYJefxeHOSueA/sendMessage?chat_id=-4683258951

https://api.telegram.org/bot8137934554:AAFOeSb9oJjQx7sEfNVTiItYJefxeHOSueA/getUpdates?offset=-

https://api.telegram.org/bot8137934554:AAFOeSb9oJjQx7sEfNVTiItYJefxeHOSueA/sendDocument?chat_id=-4683258951&caption=%F0%9F%93%B8Screenshot%20take

Signatures

  • Gurcu family
  • Gurcu, WhiteSnake

    Gurcu aka WhiteSnake is a malware stealer written in C#.

  • MilleniumRat

    MilleniumRat is a remote access trojan written in C#.

  • Milleniumrat family
  • Checks computer location settings 2 TTPs 4 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 4 IoCs
  • Loads dropped DLL 4 IoCs
  • Reads user/profile data of web browsers 3 TTPs

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

  • Adds Run key to start application 2 TTPs 1 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 5 IoCs
  • Looks up external IP address via web service 1 IoCs

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

  • Enumerates processes with tasklist 1 TTPs 2 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Browser Information Discovery 1 TTPs

    Enumerate browser information.

  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Checks processor information in registry 2 TTPs 2 IoCs

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

  • Delays execution with timeout.exe 2 IoCs
  • Modifies registry key 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 7 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 52 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\system32.dll.exe
    "C:\Users\Admin\AppData\Local\Temp\system32.dll.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:876
    • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
      2⤵
        PID:184
      • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
        "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
        2⤵
          PID:952
        • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
          "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
          2⤵
            PID:1404
          • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
            "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
            2⤵
              PID:4652
            • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
              "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
              2⤵
              • Checks computer location settings
              • System Location Discovery: System Language Discovery
              • Suspicious use of WriteProcessMemory
              PID:3976
              • C:\Users\Admin\AppData\Roaming\kernal32.dll.exe
                "C:\Users\Admin\AppData\Roaming\kernal32.dll.exe"
                3⤵
                • Checks computer location settings
                • Executes dropped EXE
                • Loads dropped DLL
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                • Suspicious use of WriteProcessMemory
                PID:4408
                • C:\Windows\System32\cmd.exe
                  "C:\Windows\System32\cmd.exe" /C C:\Users\Admin\AppData\Local\Temp\tmp4A62.tmp.bat & Del C:\Users\Admin\AppData\Local\Temp\tmp4A62.tmp.bat
                  4⤵
                  • Suspicious use of WriteProcessMemory
                  PID:2804
                  • C:\Windows\system32\chcp.com
                    chcp 65001
                    5⤵
                      PID:4288
                    • C:\Windows\system32\tasklist.exe
                      Tasklist /fi "PID eq 4408"
                      5⤵
                      • Enumerates processes with tasklist
                      • Suspicious use of AdjustPrivilegeToken
                      PID:3940
                    • C:\Windows\system32\find.exe
                      find ":"
                      5⤵
                        PID:2156
                      • C:\Windows\system32\timeout.exe
                        Timeout /T 1 /Nobreak
                        5⤵
                        • Delays execution with timeout.exe
                        PID:4444
                      • C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLog\Update.exe
                        "C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLog\Update.exe"
                        5⤵
                        • Checks computer location settings
                        • Executes dropped EXE
                        • Loads dropped DLL
                        • Checks processor information in registry
                        • Suspicious behavior: EnumeratesProcesses
                        • Suspicious use of AdjustPrivilegeToken
                        • Suspicious use of SetWindowsHookEx
                        • Suspicious use of WriteProcessMemory
                        PID:4412
                        • C:\Windows\System32\cmd.exe
                          "C:\Windows\System32\cmd.exe" /c reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Run /v ChromeUpdate /t REG_SZ /d C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLog\Update.exe /f
                          6⤵
                          • Suspicious use of WriteProcessMemory
                          PID:4536
                          • C:\Windows\system32\reg.exe
                            reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Run /v ChromeUpdate /t REG_SZ /d C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLog\Update.exe /f
                            7⤵
                            • Adds Run key to start application
                            • Modifies registry key
                            PID:3272
                  • C:\Users\Admin\AppData\Roaming\system32.dll.exe
                    "C:\Users\Admin\AppData\Roaming\system32.dll.exe"
                    3⤵
                    • Checks computer location settings
                    • Executes dropped EXE
                    • Loads dropped DLL
                    • Suspicious behavior: EnumeratesProcesses
                    • Suspicious use of AdjustPrivilegeToken
                    • Suspicious use of WriteProcessMemory
                    PID:3524
                    • C:\Windows\System32\cmd.exe
                      "C:\Windows\System32\cmd.exe" /C C:\Users\Admin\AppData\Local\Temp\tmp75E7.tmp.bat & Del C:\Users\Admin\AppData\Local\Temp\tmp75E7.tmp.bat
                      4⤵
                      • Suspicious use of WriteProcessMemory
                      PID:3932
                      • C:\Windows\system32\chcp.com
                        chcp 65001
                        5⤵
                          PID:4552
                        • C:\Windows\system32\tasklist.exe
                          Tasklist /fi "PID eq 3524"
                          5⤵
                          • Enumerates processes with tasklist
                          • Suspicious use of AdjustPrivilegeToken
                          PID:3220
                        • C:\Windows\system32\find.exe
                          find ":"
                          5⤵
                            PID:3828
                          • C:\Windows\system32\timeout.exe
                            Timeout /T 1 /Nobreak
                            5⤵
                            • Delays execution with timeout.exe
                            PID:772
                          • C:\Users\Admin\AppData\Roaming\AdminUserCash\tempdatalogger.exe
                            "C:\Users\Admin\AppData\Roaming\AdminUserCash\tempdatalogger.exe"
                            5⤵
                            • Executes dropped EXE
                            • Loads dropped DLL
                            • Suspicious use of AdjustPrivilegeToken
                            PID:4872

                  Network

                  MITRE ATT&CK Enterprise v15

                  Replay Monitor

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                  Downloads

                  • C:\Users\Admin\AppData\Local\Temp\Costura\A54E036D2DCD19384E8EA53862E0DD8F\64\sqlite.interop.dll

                    Filesize

                    1.7MB

                    MD5

                    65ccd6ecb99899083d43f7c24eb8f869

                    SHA1

                    27037a9470cc5ed177c0b6688495f3a51996a023

                    SHA256

                    aba67c7e6c01856838b8bc6b0ba95e864e1fdcb3750aa7cdc1bc73511cea6fe4

                    SHA512

                    533900861fe36cf78b614d6a7ce741ff1172b41cbd5644b4a9542e6ca42702e6fbfb12f0fbaae8f5992320870a15e90b4f7bf180705fc9839db433413860be6d

                  • C:\Users\Admin\AppData\Local\Temp\tmp4A62.tmp.bat

                    Filesize

                    286B

                    MD5

                    1262ee456b0316c775fca7312251e84e

                    SHA1

                    ab85058ca0df84c872fa09221edac087af3adbc2

                    SHA256

                    dfd188e394ad5002d1efbd7be3aef7f5854632fcf1ea6970352820cc48865229

                    SHA512

                    27fe1cec7dcbc415eb07debeed58841b723c8971e1d9259feb2f11c6ad4238b0cf8da12c8ab4a8701f1e9fd4836f5af51c1363f731e82c5b19205c1b6f46fc92

                  • C:\Users\Admin\AppData\Local\Temp\tmp75E7.tmp.bat

                    Filesize

                    278B

                    MD5

                    aa2a36d2d9a1e37b0ec1fe95e5344f7b

                    SHA1

                    2fa2891b4627760de84cb6a7ff7d1be4e6fc69b7

                    SHA256

                    25899b34cb52a75771375d36f4d4ad3fb1e671a7d4325684ccaaec19cf188d5c

                    SHA512

                    e692c6ee92ddeed0df648ceef212344a1ec4fdfed37888b51f7847303979b8e611da0db25ea68e800541da5366164f024f54ed965c39a29b164acf0ad34207ae

                  • C:\Users\Admin\AppData\Roaming\kernal32.dll.exe

                    Filesize

                    5.7MB

                    MD5

                    06adcba87d10b2bf6aadb6b69436ab88

                    SHA1

                    15e3899cff111bc86adeead73c9fc7617f05cb25

                    SHA256

                    221bf1dea0a3e29ffedf041d23c2474ffeeb1747f92538f441b233991081695e

                    SHA512

                    2b95db05c649c24d33b0245123972dec916d3c4b3ea96496efb9094e973f21aa0a10b65ccf20b560a01b3c7ee3ceb847b20be1ee9cfaf3243e215fa1e7bf4848

                  • C:\Users\Admin\AppData\Roaming\system32.dll.exe

                    Filesize

                    5.6MB

                    MD5

                    3cac99a9fb1e1997d18689fa733a726d

                    SHA1

                    139f552b75cfa3e1a7c8ca60a636ada71a670271

                    SHA256

                    408884985b428d90e09f09945edaf23321bf5295faf611a99e67e983c28fbd20

                    SHA512

                    998f370fb743cc87fb5d381a709f11e13cc7a7d94428bbd649cbd4f7a8bf3a26f4fb333e575e360a7863fce148ae3f7fb66cf3d0604e743a8643c1c7c7ff63ab

                  • memory/876-10-0x0000000074ECE000-0x0000000074ECF000-memory.dmp

                    Filesize

                    4KB

                  • memory/876-12-0x0000000011E20000-0x0000000012988000-memory.dmp

                    Filesize

                    11.4MB

                  • memory/876-7-0x0000000005B60000-0x0000000005B66000-memory.dmp

                    Filesize

                    24KB

                  • memory/876-8-0x000000000A0A0000-0x000000000A0AA000-memory.dmp

                    Filesize

                    40KB

                  • memory/876-9-0x000000000BF70000-0x000000000BFE6000-memory.dmp

                    Filesize

                    472KB

                  • memory/876-5-0x000000000C3E0000-0x000000000C984000-memory.dmp

                    Filesize

                    5.6MB

                  • memory/876-11-0x0000000074EC0000-0x0000000075670000-memory.dmp

                    Filesize

                    7.7MB

                  • memory/876-6-0x000000000BED0000-0x000000000BF62000-memory.dmp

                    Filesize

                    584KB

                  • memory/876-13-0x0000000005D10000-0x0000000005D2E000-memory.dmp

                    Filesize

                    120KB

                  • memory/876-4-0x000000000B2C0000-0x000000000BE34000-memory.dmp

                    Filesize

                    11.5MB

                  • memory/876-17-0x0000000074EC0000-0x0000000075670000-memory.dmp

                    Filesize

                    7.7MB

                  • memory/876-3-0x0000000074EC0000-0x0000000075670000-memory.dmp

                    Filesize

                    7.7MB

                  • memory/876-0-0x0000000074ECE000-0x0000000074ECF000-memory.dmp

                    Filesize

                    4KB

                  • memory/876-2-0x0000000005AF0000-0x0000000005AF6000-memory.dmp

                    Filesize

                    24KB

                  • memory/876-1-0x0000000000610000-0x00000000011C6000-memory.dmp

                    Filesize

                    11.7MB

                  • memory/3524-54-0x0000026487DF0000-0x0000026487DFA000-memory.dmp

                    Filesize

                    40KB

                  • memory/3524-51-0x0000026485B50000-0x00000264860F6000-memory.dmp

                    Filesize

                    5.6MB

                  • memory/3976-14-0x0000000000400000-0x0000000000F64000-memory.dmp

                    Filesize

                    11.4MB

                  • memory/3976-19-0x0000000074EC0000-0x0000000075670000-memory.dmp

                    Filesize

                    7.7MB

                  • memory/3976-50-0x0000000074EC0000-0x0000000075670000-memory.dmp

                    Filesize

                    7.7MB

                  • memory/3976-18-0x0000000005850000-0x00000000058EC000-memory.dmp

                    Filesize

                    624KB

                  • memory/3976-16-0x0000000074EC0000-0x0000000075670000-memory.dmp

                    Filesize

                    7.7MB

                  • memory/4408-44-0x000002D6C1790000-0x000002D6C1806000-memory.dmp

                    Filesize

                    472KB

                  • memory/4408-45-0x000002D6A8EB0000-0x000002D6A8ECE000-memory.dmp

                    Filesize

                    120KB

                  • memory/4408-31-0x000002D6A6D10000-0x000002D6A72C0000-memory.dmp

                    Filesize

                    5.7MB

                  • memory/4412-63-0x0000024B73610000-0x0000024B7367A000-memory.dmp

                    Filesize

                    424KB

                  • memory/4412-66-0x0000024B73780000-0x0000024B737D0000-memory.dmp

                    Filesize

                    320KB

                  • memory/4412-67-0x0000024B737D0000-0x0000024B737F2000-memory.dmp

                    Filesize

                    136KB

                  • memory/4412-69-0x0000024B73840000-0x0000024B7387A000-memory.dmp

                    Filesize

                    232KB

                  • memory/4412-70-0x0000024B73800000-0x0000024B73826000-memory.dmp

                    Filesize

                    152KB

                  • memory/4412-71-0x0000024B745A0000-0x0000024B748CE000-memory.dmp

                    Filesize

                    3.2MB

                  • memory/4412-90-0x0000024B738C0000-0x0000024B738D2000-memory.dmp

                    Filesize

                    72KB

                  • memory/4412-65-0x0000024B73680000-0x0000024B73732000-memory.dmp

                    Filesize

                    712KB