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

Static analysis result for SHA-256 cff2bcf79f0950c9…

MALICIOUS

Office (OLE) / .XLS

804.0 KB Created: 2020-06-22 10:41:03 Authoring application: Microsoft Excel
MD5: 47dae4f16cf2d6e426c92d11b61d5f3b SHA-1: 3eafa359537ac1345d10999413f3db71e58cad09 SHA-256: cff2bcf79f0950c94285188a0b0b7bb3c4706438de7cefc1d412e48692f44244
400 Risk Score

Malware Insights

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

The sample is an XLS file containing a Workbook_Open VBA macro. This macro is configured to execute embedded content, specifically a PE executable. The presence of VirtualAlloc, LoadLibrary, and GetProcAddress API calls, along with a direct Shell() call and an embedded PE executable, strongly indicates that this macro is designed to download and execute a second-stage payload. The embedded executable is the highest priority IOC.

Heuristics 11

  • 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
  • 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
d1aa2a243c52b5f3cfb95ee4d01e16823458e708f72c84eb52dd2fe38f0bdef8		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 10578 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
2eb03be8006cab796e3744cd210ea09fd35f58421f21659269071fe94dc24bb8		 embedded-pe Office MZ+PE at offset 0x6265 798107 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
ole10native_00.bin
6a7ddfbd62d7b14acf0191ff71596164ed9e322382a63f3f68d56cb2c2a68d56		 ole-package OLE Ole10Native stream: MBD00AAB60E/Ole10Native 612007 bytes

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