Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 5beafdb2362d38de…

MALICIOUS

Office (OOXML) / .XLSX

111.6 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: 3524d0b04e3b0bcc266b2f5222aff6b7 SHA-1: f20c0462d33edb71d504236dc2ecf9765e199f11 SHA-256: 5beafdb2362d38deebf44ff3a371fc67b390f934690c24f1e673f1ce6ed14d0b
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The sample contains a Workbook_Open VBA macro that utilizes CreateObject to execute shell commands. These commands appear to download and execute payloads from several URLs, including 'http://reumatismclininic.com/--/scCnm3mbJRpwKbrC/' and 'https://shodhmanjar.com/wp-admn/xjEmK4Pd3N/', saving them as 'jledshf.bat' and 'sduoixo.vbs' in the programdata directory. The ClamAV detection further confirms its malicious nature.

Heuristics 6

  • ClamAV: Doc.Malware.Valyria-10004384-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-10004384-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
527d0656a0c2c323955d068683ef8f7e20c035cda247a1e24383595c0eb3403b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 7821 bytes
vbaProject_00.bin
82c45387aed97b28d0194039861075b42a309694e62d8c50cf46349f1936bd8c		 vba-project OOXML VBA project: xl/vbaProject.bin 37888 bytes
Detection
ClamAV: Doc.Malware.Valyria-10004384-0
Obfuscation or payload: unlikely

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