Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ef6d8a62c96a0fc2…

MALICIOUS

Office (OOXML)

66.3 KB Created: 2012-10-19 22:33:57 UTC Authoring application: Microsoft Excel 12.0000
MD5: c311de66dc44401313f4f68773b4c1dc SHA-1: 3eacc0d27518ceddf2268ed968bb2e2374bd4253 SHA-256: ef6d8a62c96a0fc27147b5d0116ec80c255634aa4d0379a96020afc6258731bf
208 Risk Score

Malware Insights

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

The sample contains a Workbook_Open VBA macro, a common technique for executing malicious code upon opening an Office document. The macro utilizes CreateObject to interact with the file system and attempts to write a file named 'qOLEDBQuery.xsl' to the ALLUSERSPROFILE directory. It also appears to attempt persistence by writing to the registry run key 'HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy'. The obfuscated nature of the script and the use of generic function names make precise family attribution difficult.

Heuristics 6

  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
3a9ad8abe7e7f0979fce26f375909f9118183a08d965138f280c318d3e9b9f4e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3632 bytes
vbaProject_00.bin
3b377156842cce5c39ee0d8c35329c652dcac05cc3c4b10bf1e0cea805137311		 vba-project OOXML VBA project: xl/vbaProject.bin 16896 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.