Analysis

  • max time kernel
    15s
  • max time network
    150s
  • platform
    windows11-21h2_x64
  • resource
    win11-20250410-en
  • resource tags

    arch:x64arch:x86image:win11-20250410-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    17/04/2025, 05:23

General

  • Target

    2025 Staff Satisfaction Survey.exe

  • Size

    693KB

  • MD5

    9e44332968633c219a3207a63bd73d98

  • SHA1

    c42747558e13f300e05a26e2c545257b29172701

  • SHA256

    79adf75aed9c95e003d6726b4df5a6f98233e1e2712e39dcbfb02dd479cf4742

  • SHA512

    42243f0f37db43e16d13c63fd50882a43a1203f36cf71333b082271544950ad839241e00d5dfca219207d35120bcb6bc1a36fb1dd70df8a98ab5789a0a742065

  • SSDEEP

    12288:BY/aiHIbJPf/kGO7mRbOHnzq05vjYN54edUNxScVDGEOx31BNaMf8nQxehZZY8:BY/aDbJPnkGO6b2zqLe/TOXBNaMknYe3

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

196.251.92.62:2404

Attributes
  • audio_folder

    MicRecords

  • audio_path

    ApplicationPath

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    remcos.exe

  • copy_folder

    Remcos

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    false

  • install_flag

    true

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • mouse_option

    false

  • mutex

    Rmc-Q6KAMU

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • Guloader family
  • Guloader,Cloudeye

    A shellcode based downloader first seen in 2020.

  • Remcos

    Remcos is a closed-source remote control and surveillance software.

  • Remcos family
  • Detected Nirsoft tools 4 IoCs

    Free utilities often used by attackers which can steal passwords, product keys, etc.

  • NirSoft MailPassView 1 IoCs

    Password recovery tool for various email clients

  • NirSoft WebBrowserPassView 2 IoCs

    Password recovery tool for various web browsers

  • Executes dropped EXE 3 IoCs
  • Loads dropped DLL 4 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 4 IoCs
  • Drops file in System32 directory 4 IoCs
  • Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs
  • Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs
  • Drops file in Windows directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

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

  • Suspicious behavior: MapViewOfSection 1 IoCs
  • Suspicious use of WriteProcessMemory 13 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2025 Staff Satisfaction Survey.exe
    "C:\Users\Admin\AppData\Local\Temp\2025 Staff Satisfaction Survey.exe"
    1⤵
    • Loads dropped DLL
    • Drops file in System32 directory
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Drops file in Windows directory
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: MapViewOfSection
    • Suspicious use of WriteProcessMemory
    PID:3660
    • C:\Users\Admin\AppData\Local\Temp\2025 Staff Satisfaction Survey.exe
      "C:\Users\Admin\AppData\Local\Temp\2025 Staff Satisfaction Survey.exe"
      2⤵
      • Adds Run key to start application
      • Suspicious use of NtCreateThreadExHideFromDebugger
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:2948
      • C:\ProgramData\Remcos\remcos.exe
        "C:\ProgramData\Remcos\remcos.exe"
        3⤵
        • Executes dropped EXE
        • Drops file in System32 directory
        • System Location Discovery: System Language Discovery
        PID:976
  • C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "C:\ProgramData\Remcos\remcos.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:5276
    • C:\ProgramData\Remcos\remcos.exe
      C:\ProgramData\Remcos\remcos.exe
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Drops file in System32 directory
      • Drops file in Windows directory
      • System Location Discovery: System Language Discovery
      PID:3280
      • C:\ProgramData\Remcos\remcos.exe
        C:\ProgramData\Remcos\remcos.exe
        3⤵
          PID:3440
          • C:\Windows\SysWOW64\recover.exe
            C:\Windows\SysWOW64\recover.exe /stext "C:\Users\Admin\AppData\Local\Temp\fvhpvsnzvxnbhlntvwcg"
            4⤵
              PID:1740
            • C:\Windows\SysWOW64\recover.exe
              C:\Windows\SysWOW64\recover.exe /stext "C:\Users\Admin\AppData\Local\Temp\qxuawlybjfggjrcwnhwacsv"
              4⤵
                PID:6120
              • C:\Windows\SysWOW64\recover.exe
                C:\Windows\SysWOW64\recover.exe /stext "C:\Users\Admin\AppData\Local\Temp\srzswdjvfnytufyiwsjbnxqgrkc"
                4⤵
                  PID:4108
                • C:\Windows\SysWOW64\recover.exe
                  C:\Windows\SysWOW64\recover.exe /stext "C:\Users\Admin\AppData\Local\Temp\srzswdjvfnytufyiwsjbnxqgrkc"
                  4⤵
                    PID:656
            • C:\Windows\system32\cmd.exe
              C:\Windows\system32\cmd.exe /c "C:\ProgramData\Remcos\remcos.exe"
              1⤵
              • Suspicious use of WriteProcessMemory
              PID:2808
              • C:\ProgramData\Remcos\remcos.exe
                C:\ProgramData\Remcos\remcos.exe
                2⤵
                • Executes dropped EXE
                • Drops file in System32 directory
                • System Location Discovery: System Language Discovery
                PID:5868
            • C:\Windows\system32\cmd.exe
              C:\Windows\system32\cmd.exe /c "C:\ProgramData\Remcos\remcos.exe"
              1⤵
                PID:4984
                • C:\ProgramData\Remcos\remcos.exe
                  C:\ProgramData\Remcos\remcos.exe
                  2⤵
                    PID:4640
                    • C:\ProgramData\Remcos\remcos.exe
                      C:\ProgramData\Remcos\remcos.exe
                      3⤵
                        PID:5736
                  • C:\Windows\system32\cmd.exe
                    C:\Windows\system32\cmd.exe /c "C:\ProgramData\Remcos\remcos.exe"
                    1⤵
                      PID:4964
                      • C:\ProgramData\Remcos\remcos.exe
                        C:\ProgramData\Remcos\remcos.exe
                        2⤵
                          PID:1868

                      Network

                      MITRE ATT&CK Enterprise v16

                      Replay Monitor

                      Loading Replay Monitor...

                      Downloads

                      • C:\ProgramData\Remcos\remcos.exe

                        Filesize

                        693KB

                        MD5

                        9e44332968633c219a3207a63bd73d98

                        SHA1

                        c42747558e13f300e05a26e2c545257b29172701

                        SHA256

                        79adf75aed9c95e003d6726b4df5a6f98233e1e2712e39dcbfb02dd479cf4742

                        SHA512

                        42243f0f37db43e16d13c63fd50882a43a1203f36cf71333b082271544950ad839241e00d5dfca219207d35120bcb6bc1a36fb1dd70df8a98ab5789a0a742065

                      • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA

                        Filesize

                        1KB

                        MD5

                        517b42c897481d3ef87c7d3590dc4556

                        SHA1

                        52db14d62d6e762bf4ee6458d4e562abffe66dd1

                        SHA256

                        8b03de3b33087141fa82c1e1cd7e6c704a47d755316c62cbaa63b5eb84192af5

                        SHA512

                        86c0d25d1825b6dbf3b415ec3e5ce87a55177bf9c9e6ff176dd98b8a44fe9082ae457d2b8c01c4f24c0e1e530c99307bce3c5600f1d1c9964e24551d99175b11

                      • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\B3513D73A177A2707D910183759B389B_D1B2C3FDC4CC18AB2F25B2BB5E2D4A02

                        Filesize

                        471B

                        MD5

                        1d4632adbc075ecbc910f1dc1ea7aab7

                        SHA1

                        aefef0d5a36d2ccbb0269d89acd7607c185563b9

                        SHA256

                        da21852c5ec264fdf502462af387cc11b877e6df1a9cf6aa11634f084bde188f

                        SHA512

                        e024a6cc7f80cf0b70479bb3d98593f7b2ee07ecf37eaa892a828f889614cdce3a6a3cb203a02d7150b593f2f48e9bf1e80635b07f2fe6d2a7f5685f6b9fe34b

                      • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA

                        Filesize

                        410B

                        MD5

                        f3b230e352371185021a07c707b0edbd

                        SHA1

                        3b98ff3bfe31bf8911c7e42d22ebe40567e2ae66

                        SHA256

                        e81c6de07ebb563626c99fa843b5c13d8a747cc1d5b18bf3bef61a1076374c27

                        SHA512

                        e5cdb473919a6d00bad01e380ced3ad9e9f588ffac8d3a52ce6d584a46a76cb30689a4f8f30445b450eda454e95d485771556998576a48bf5b551998b136e49c

                      • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B3513D73A177A2707D910183759B389B_D1B2C3FDC4CC18AB2F25B2BB5E2D4A02

                        Filesize

                        402B

                        MD5

                        b488a974ff6ac7602bd72c69d07cce25

                        SHA1

                        98b47974584ed7cb3d84c9bb203e42ecf6fcc7d0

                        SHA256

                        c19a94c858b98496dfd04e5f9577a7340a4b4a667194a309d1d2442c9f099123

                        SHA512

                        17eeb0840efe884e15e96982ac47177a6965633b155a7076a89c6b509eb5ca09fd593ee5c5625e3d30fd75942c593625d644f2fb40282c31b488e994acd5867e

                      • C:\Users\Admin\AppData\Local\Temp\nsj835B.tmp\System.dll

                        Filesize

                        12KB

                        MD5

                        cff85c549d536f651d4fb8387f1976f2

                        SHA1

                        d41ce3a5ff609df9cf5c7e207d3b59bf8a48530e

                        SHA256

                        8dc562cda7217a3a52db898243de3e2ed68b80e62ddcb8619545ed0b4e7f65a8

                        SHA512

                        531d6328daf3b86d85556016d299798fa06fefc81604185108a342d000e203094c8c12226a12bd6e1f89b0db501fb66f827b610d460b933bd4ab936ac2fd8a88

                      • C:\Users\Admin\hjemmefronter\Synthetase54\Xylophagan\Guldmedaljen\Lamper.jpg

                        Filesize

                        97KB

                        MD5

                        76aa50f1e0bcb4ed44e0da686fb1115a

                        SHA1

                        c2083f4218ab03cb5dd7e1fa12cc5b026a2b63fb

                        SHA256

                        d7e7113a11841604012fdcb8037ca28de5161a3b9ccffcb8440fba1847e128d8

                        SHA512

                        9e295d7881d9e7341f1082221bb5f5ebeee0fa9cb02c6c5ae58194037be23611e5e3a910101afa7509467445a430f459fb3c54016e2874df45781882a0498be4

                      • C:\Users\Admin\hjemmefronter\Synthetase54\Xylophagan\Guldmedaljen\Overnervous.Sla

                        Filesize

                        354KB

                        MD5

                        d5c2c281efe1b28b63ce51cb7fba3c9f

                        SHA1

                        8c34349bf2e2ac50af8730c57d99ea1d6d658448

                        SHA256

                        b68e75b27429029af6e5086dec8696e2dc1bdd00b560cb3597755689500165f9

                        SHA512

                        558b394efcc4a571ff5a1826fa6fa79bb374499e61599f198b6bb14b30b82e3e1dea1fa15d6e184197618c19a40aa84e41413ec37e142232ca0f0eb43666152f

                      • C:\Users\Admin\hjemmefronter\Synthetase54\Xylophagan\Guldmedaljen\Refascinate.Nvn

                        Filesize

                        61KB

                        MD5

                        e2d49fc32bd0b0712384cedfe5349f76

                        SHA1

                        defff8f40b1abd20d52ded1b4cbc3f68c6bfb338

                        SHA256

                        c087461107716a1f813fa2173f2b5a5adf87476bb292208f59756aa1129cb639

                        SHA512

                        a36abb0b610cd866a0ff7b703846548e1bef8414f0804edc103b6aba5e086451550b14233bc8ad9fb9ee807c4cd02585ac9f4168673fd2739ee35f285628f293

                      • C:\Users\Admin\hjemmefronter\Synthetase54\Xylophagan\Guldmedaljen\blev.sic

                        Filesize

                        321KB

                        MD5

                        2bd23a1fe1db40048da512bea4500417

                        SHA1

                        983f7443e7c4c8a37cc92b06b9aefee6e6bf57b9

                        SHA256

                        f90b84e5e4fad7afcec2a9f9d29fbacde444ff121f6b1801c2dce6748fb05068

                        SHA512

                        e0ce68c81576f52643b59ac448b949617810a62f9b093073304a443d879ab671b006a58c0e50b29197bf053c4d8c01670a3b9efe0d564dd9dd85e160bd281509

                      • C:\Users\Admin\hjemmefronter\Synthetase54\Xylophagan\Guldmedaljen\colleens.txt

                        Filesize

                        370B

                        MD5

                        313a9633a58de00315d4b8a88456dbd4

                        SHA1

                        ac8642ba8fc5ad947be76992b388ba90c1f4f29d

                        SHA256

                        cab61979083d60310c85253bc87b5047a40869b56f1d78885f45556a809f47e8

                        SHA512

                        c274194f91eff6525d039f602bce9294ebfd805ee1382946a3f89fdf6e6c7e315ff50462c54c51a80da97de66c75e2b450d626b28ac31f391c85f9a6de1f87d1

                      • C:\Users\Admin\hjemmefronter\Synthetase54\Xylophagan\Guldmedaljen\fagkyndige.ini

                        Filesize

                        39B

                        MD5

                        cfc5144c3a75d5f817151ecf6e59b0f3

                        SHA1

                        324399c734ad798dd6f1eead4534f6f9e6bbdd21

                        SHA256

                        e8ec675329b6f0e7223548d4dae4fe8787e077ea654913ab4509d927ad5e0bba

                        SHA512

                        1e91beba4352d45e4a784956c4b2c7cd19f3cc38bece8aa1f0729e4a4b6f334d8b55ff1083bf42c942b7c755740adae4e316654828c4c004bc838671505b2adb

                      • C:\Users\Admin\hjemmefronter\Synthetase54\Xylophagan\Guldmedaljen\myocardium.set

                        Filesize

                        394KB

                        MD5

                        e394eba898e6c64de87228a8e2f86480

                        SHA1

                        56d3342568f90282edcb24da3d79559316d1f181

                        SHA256

                        f2eaac6d269bf7ba5e033a525359ea1865dcb4008f8d320fa1883e90705b74f2

                        SHA512

                        bd99eaf068ac0309ddf6ebfe7862dcd33b5fbb4cb350a7f18791d984600e70978e00348a32e0e8157e8a145eb50c18dd9617684ae3f009932eacdc67ba115413

                      • C:\Users\Admin\hjemmefronter\Synthetase54\Xylophagan\Guldmedaljen\noncontestable.sys

                        Filesize

                        356KB

                        MD5

                        1c0e5e3fad38ad4c071145b0c91b1c75

                        SHA1

                        d4332d34c719454b251de7fea2f7ebf74e9ce59f

                        SHA256

                        c9d19087bf0a5cce7b23a791be76d2ed701b7dce69f86baefaa99e7a19fb1567

                        SHA512

                        9b71e0ac39de87e365d87df4052922d545f90e9b899b962459b9f9e5598a19a36ce247e03cc916d76feef53c5a54a6ae7bb8694e08cfa28822a522f2782a6689

                      • C:\Users\Admin\hjemmefronter\Synthetase54\Xylophagan\Lovats\opkast.jpg

                        Filesize

                        8KB

                        MD5

                        a798defe4bd96ce304a2b64ba9db9451

                        SHA1

                        ebe61d1bb9f882db6779e125239c94e24fa31ac8

                        SHA256

                        4c4e725a9de497a0171cb912ae1039cf782bdda0791bc15e6960c643f36282b7

                        SHA512

                        6e5b183e0fd717c7f56318f6cb8b2e273c5541d1c0205cb9af317d66a062613c9d5e08d601ed8164c6bb785349482f2406db34254bc886898a165b3608aebd69

                      • C:\Users\Admin\hjemmefronter\Synthetase54\Xylophagan\Lovats\wineshop.ini

                        Filesize

                        616B

                        MD5

                        059cb6042549f01a636176876a196d29

                        SHA1

                        434624b61da12f82cd9dd001cf89071e289d6692

                        SHA256

                        c937269a7ddc6b76b73dd9cbd9e64b318665f2c622b00a7ab6e8d0cc31583c2c

                        SHA512

                        6fdd35b9bd2494f7a4831779cf5e55aa7620cc41c08915aca25279dc071f2016e6960c9c50a4d709a64a7b2d01234b11144e82159ad8a671535cade0c66ee208

                      • memory/656-186-0x0000000000400000-0x0000000000424000-memory.dmp

                        Filesize

                        144KB

                      • memory/656-188-0x0000000000400000-0x0000000000424000-memory.dmp

                        Filesize

                        144KB

                      • memory/656-189-0x0000000000400000-0x0000000000424000-memory.dmp

                        Filesize

                        144KB

                      • memory/1740-179-0x0000000000400000-0x000000000047D000-memory.dmp

                        Filesize

                        500KB

                      • memory/1740-178-0x0000000000400000-0x000000000047D000-memory.dmp

                        Filesize

                        500KB

                      • memory/2948-21-0x00007FFD22E20000-0x00007FFD23029000-memory.dmp

                        Filesize

                        2.0MB

                      • memory/2948-36-0x0000000001780000-0x000000000314A000-memory.dmp

                        Filesize

                        25.8MB

                      • memory/2948-98-0x00007FFD22E20000-0x00007FFD23029000-memory.dmp

                        Filesize

                        2.0MB

                      • memory/2948-52-0x0000000000460000-0x0000000001777000-memory.dmp

                        Filesize

                        19.1MB

                      • memory/2948-32-0x0000000000460000-0x0000000001777000-memory.dmp

                        Filesize

                        19.1MB

                      • memory/2948-31-0x00007FFD22E20000-0x00007FFD23029000-memory.dmp

                        Filesize

                        2.0MB

                      • memory/3440-194-0x00000000343F0000-0x0000000034409000-memory.dmp

                        Filesize

                        100KB

                      • memory/3440-198-0x0000000000460000-0x0000000001777000-memory.dmp

                        Filesize

                        19.1MB

                      • memory/3440-209-0x0000000000460000-0x0000000001777000-memory.dmp

                        Filesize

                        19.1MB

                      • memory/3440-127-0x0000000000460000-0x0000000001777000-memory.dmp

                        Filesize

                        19.1MB

                      • memory/3440-213-0x0000000000460000-0x0000000001777000-memory.dmp

                        Filesize

                        19.1MB

                      • memory/3440-131-0x0000000001780000-0x000000000314A000-memory.dmp

                        Filesize

                        25.8MB

                      • memory/3440-210-0x0000000000460000-0x0000000001777000-memory.dmp

                        Filesize

                        19.1MB

                      • memory/3440-199-0x0000000000460000-0x0000000001777000-memory.dmp

                        Filesize

                        19.1MB

                      • memory/3440-212-0x0000000000460000-0x0000000001777000-memory.dmp

                        Filesize

                        19.1MB

                      • memory/3440-120-0x0000000001780000-0x000000000314A000-memory.dmp

                        Filesize

                        25.8MB

                      • memory/3440-190-0x00000000343F0000-0x0000000034409000-memory.dmp

                        Filesize

                        100KB

                      • memory/3440-122-0x0000000000460000-0x0000000001777000-memory.dmp

                        Filesize

                        19.1MB

                      • memory/3440-193-0x00000000343F0000-0x0000000034409000-memory.dmp

                        Filesize

                        100KB

                      • memory/3440-211-0x0000000000460000-0x0000000001777000-memory.dmp

                        Filesize

                        19.1MB

                      • memory/3440-195-0x0000000000460000-0x0000000001777000-memory.dmp

                        Filesize

                        19.1MB

                      • memory/3440-196-0x0000000000460000-0x0000000001777000-memory.dmp

                        Filesize

                        19.1MB

                      • memory/3440-207-0x0000000000460000-0x0000000001777000-memory.dmp

                        Filesize

                        19.1MB

                      • memory/3660-22-0x0000000003450000-0x0000000004E1A000-memory.dmp

                        Filesize

                        25.8MB

                      • memory/3660-19-0x00007FFD22E20000-0x00007FFD23029000-memory.dmp

                        Filesize

                        2.0MB

                      • memory/3660-18-0x00007FFD22E21000-0x00007FFD22F4A000-memory.dmp

                        Filesize

                        1.2MB

                      • memory/3660-17-0x0000000003450000-0x0000000004E1A000-memory.dmp

                        Filesize

                        25.8MB

                      • memory/5736-206-0x0000000000460000-0x0000000001777000-memory.dmp

                        Filesize

                        19.1MB

                      • memory/5736-205-0x0000000001780000-0x000000000314A000-memory.dmp

                        Filesize

                        25.8MB

                      • memory/5736-204-0x0000000000460000-0x0000000001777000-memory.dmp

                        Filesize

                        19.1MB

                      • memory/6120-180-0x0000000000400000-0x0000000000462000-memory.dmp

                        Filesize

                        392KB

                      • memory/6120-182-0x0000000000400000-0x0000000000462000-memory.dmp

                        Filesize

                        392KB

                      • memory/6120-181-0x0000000000400000-0x0000000000462000-memory.dmp

                        Filesize

                        392KB