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

Static analysis result for SHA-256 41e010c15bc03fb2…

MALICIOUS

Office (OLE) / .XLS

795.5 KB Created: 2020-06-22 10:41:03 Authoring application: Microsoft Excel
MD5: a92d806b9a150a1dc7a484b92fee3b70 SHA-1: 23f600c877236eb9dda464e8f3ac4b2358e2aa45 SHA-256: 41e010c15bc03fb208d8361ade5422a834760cbc6f536f7bbc2cfe8b332e161f
520 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer T1204.002 Malicious File

This XLS file contains a Workbook_Open VBA macro that utilizes the Shell() function, indicating an attempt to execute arbitrary code. The critical heuristic 'OLE_EMBEDDED_EXE' confirms the presence of an embedded PE executable, and ClamAV signatures 'Win.Dropper.Hideproc-6663113-0' further classify it as a dropper. The macro likely serves to extract and execute this embedded payload, which is a common technique for downloading and running second-stage malware.

Heuristics 13

  • 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
  • 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
e4484270eddd470d92b0a0c42cc523e64a7056ea68b59aa12626ba67c5a2192c		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 10605 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
embedded_office_00006265.exe
5713e44c7d081cacc4c1cedeb11bb3919a3ce578ae9ca666d7dd68c4712a3956		 embedded-pe Office MZ+PE at offset 0x6265 789403 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
ba380a9ac8cf9a519b12e971637580f741b28f08dd1f181175cc5c3d1545153c		 ole-package OLE Ole10Native stream: MBD005A12B8/Ole10Native 610471 bytes

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