Office (OLE) / .XLS malware analysis — malicious · acf0a503e9bdf8a3

MALICIOUS

Office (OLE) / .XLS

409.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: 295dbcf85c2baffd99e4670c21afc93c SHA-1: 3dfb83a771615b879d20445ff5e5143d5846de6a SHA-256: acf0a503e9bdf8a32edfb667776fd159a70f4f9173c01c024c82bb6dd658e451

182 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The sample is an Excel spreadsheet containing VBA macros, including an Auto_Open subroutine. The heuristics indicate the use of URLDownloadToFile, suggesting the macro's intent is to download and execute a second-stage payload from one of the embedded URLs. The presence of Auto_Open and Auto_Close macros, along with the explicit reference to URLDownloadToFile, strongly points to a malicious downloader.

Heuristics 6

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
Auto_Open macro high OLE_VBA_AUTO

Auto_Open macro
Auto_Close macro high OLE_VBA_AUTOCLOSE

Auto_Close macro
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Suspicious extracted artifact medium 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.
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://190.14.37.173/
- http://111.90.148.104/
- http://51.89.115.111/

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `56c0ee2129bf6ddf3a752d33fd7fa867cfc834d82cd12f3c855f07531734066f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	3792 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 shell/COM execution token(s).

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