Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 0835bd1207f9d600…

MALICIOUS

Office (OLE) / .XLS

727.5 KB Created: 2020-06-22 10:41:03 Authoring application: Microsoft Excel
MD5: 90f72319caf6458c1308e94bfb257f7c SHA-1: 1825b4934ea2ba00737ee14155af41553304b913 SHA-256: 0835bd1207f9d600e13128a9e687bcde61f76d358cca024aa0dfcbbc3a599a41
562 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an Excel file containing VBA macros, specifically a Workbook_Open event that triggers execution. This macro uses the Shell() function to launch an embedded PE executable (embedded_office_00006269.exe). The presence of VirtualAlloc and LoadLibrary API calls in the VBA code suggests the embedded executable is likely a dropper or downloader for further malicious activity. The ClamAV detection of 'Win.Dropper.Hideproc-6663113-0' further supports this assessment.

Heuristics 14

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Embedded PE executable critical OLE_EMBEDDED_EXE
    MZ/PE header found inside document — possible embedded executable
  • ClamAV: Win.Dropper.Hideproc-6663113-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Dropper.Hideproc-6663113-0
  • 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.
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Reference to LoadLibrary API high SC_STR_LOADLIBRARY
    Reference to LoadLibrary API
  • Reference to GetProcAddress API high SC_STR_GETPROCADDRESS
    Reference to GetProcAddress API
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC
    Reference to VirtualAlloc API
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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 http://www.w3.org/2000/svg
    • http://www.w3.org/1999/xlink

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
e50751ccd095abc221ff70134e013b1c245a8cc9c6506ca96a1b1fbd5bc726f7		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 30923 bytes
embedded_office_00006269.exe
c8a9eb9751ce7fab154a6b45eda7b3d92bed55e79eb597b2c0f9d572db25628a		 embedded-pe Office MZ+PE at offset 0x6269 719767 bytes
Detection
ClamAV: Win.Dropper.Hideproc-6663113-0
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
ole10native_00.bin
944aceb7d2a50f7a601219f1973a25149cee90f4fc8af55611c66ae08e3a038d		 ole-package OLE Ole10Native stream: MBD007A19C2/Ole10Native 610483 bytes

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