Xls.Downloader.Trojan-aa0b8f388d8573cd — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 b5c3cb22b04a481f…

MALICIOUS

Office (OLE) / .XLS

1.29 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 687e2dbe29881473305307b385e83aa6 SHA-1: 19fb4e457a0d672b337941d0c1b4f74dd80d382e SHA-256: b5c3cb22b04a481fa8052965bda8161c48bd9536b0815c1a362555ad5156d336
128 Risk Score

Malware Insights

Xls.Downloader.Trojan-aa0b8f388d8573cd · confidence 95%

MITRE ATT&CK
T1204.002 Malicious File T1059.005 Visual Basic

The critical heuristic firing for CVE-2017-0199 indicates the file is designed to exploit this vulnerability via a URL moniker. The extracted URL, http://tny.wtf/EvwK, is likely used to download and execute a secondary payload. The ClamAV detection further confirms its malicious nature as a downloader trojan.

Heuristics 3

  • OLE2Link / URL Moniker → remote loader — CVE-2017-0199 critical CVE likely CVE_2017_0199
    Document contains an embedded OLE link object whose URL Moniker points to a remote URL. When the host file is opened, Office follows the link, downloads the URL, and processes the response based on its Content-Type (HTA -> mshta.exe, RTF → Word, etc.) — the documented CVE-2017-0199 primitive. The URL extension is not a reliable filter; servers can return different payloads to Office's user agent.
  • ClamAV: Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673
vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes