Office (OLE) / .XLS malware analysis — malicious · 1b3b1ca6973063eb

MALICIOUS

Office (OLE) / .XLS

75.0 KB Created: 2023-01-26 07:44:43 Authoring application: Microsoft Excel First seen: 2023-01-31

MD5: c419654969c1c15b835888f018fe42a8 SHA-1: 4b42620fbcb2bfdcca26de9d955a58c2159e28b8 SHA-256: 1b3b1ca6973063eb1db5400f7d484da6556d3c2649be87cd7e1c9b0fcf30518f

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1059.003 Windows Command Shell

The VBA macro contains calls to URLDownloadToFileA and Shell(), indicating an intent to download and execute a second-stage payload. The macro reconstructs the URL 'http://2ht40t1p11s4:6/12/3d6op66ler90to8ol1.c4o0m4' and uses 'rundll32.exe' to execute the downloaded file. The Environ() function is used to construct a temporary file path in the user's documents directory.

Heuristics 5

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `610678525f680629a452c08992aa06919dfc565e5b8524fa718fe59d9d46112b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1771 bytes

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