Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 170eb11b90b7c39d…

MALICIOUS

Office (OOXML)

10.4 KB
MD5: ad3b6088630a6423c1043d4a378427ef SHA-1: 0a4066ed12147ba9ec8869f2a9f2ff7473848324 SHA-256: 170eb11b90b7c39dc0edd63d6144899c36849de102bd242f661fcbcf0709bf15
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The OOXML document contains a VBA macro with an Auto_Open subroutine, which is a common technique for executing malicious code upon opening. The script reassembles the string 'powershell' using split keywords and calls the ShellExecuteA API, indicating an intent to execute a command, likely to download and run a second-stage payload. The VBA project part was also renamed to evade detection.

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/kasodkasodk.b)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
1f255dcc2ef6be96debd30a7aad392123f59834e6487c2ee78d99c601dddb7d7		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2438 bytes
vbaProject_00.bin
82e2223b5cc38eb8a9ac7ddc45ed3c604d5cd41e6dded71310268eb4b464641e		 vba-project OOXML VBA project: ppt/kasodkasodk.b 23040 bytes

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