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

Static analysis result for SHA-256 81849eabd2c60d12…

MALICIOUS

Office (OLE) / .XLS

161.5 KB Created: 2019-07-18 19:19:14 Authoring application: Microsoft Excel
MD5: a344b9520f975d2cc827165fbd9f0073 SHA-1: f586b95e89f3159a00c160ab2a6cc0836d3a1213 SHA-256: 81849eabd2c60d12e6b363d610ee874b4491ce811c92d1d5ae8d73ce3f29935e
260 Risk Score

Malware Insights

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

The file contains a Workbook_Open VBA macro that is triggered automatically upon opening. This macro utilizes CreateObject and CallByName functions, indicative of malicious intent to execute arbitrary code. Heuristics also flag suspicious cmd.exe invocation. The macro likely downloads and executes a second-stage payload from one of the unknown reputation URLs. The document body content is not directly indicative of a specific lure.

Heuristics 8

  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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.
  • 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://27.102.70.196/k2
    • http://t2.symcb.com0
    • http://tl.symcd.com0&
    • http://t1.symcb.com/ThawtePCA.crl0
    • http://tl.symcb.com/tl.crl0
    • https://www.thawte.com/cps0/
    • https://www.thawte.com/repository0W
    • http://tl.symcb.com/tl.crt0

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
0f8d5393f732295ecb858d596155660fa6602c129079ec7d970b367fb929c19b		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3342 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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