Office (OLE) / .XLS malware analysis — malicious · 8e109db3ca289527

MALICIOUS

Office (OLE) / .XLS

54.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel

MD5: cc75f66962792be28064fc912b7aa766 SHA-1: 328d81950a57f3cde2b65ca06b954a7f92016916 SHA-256: 8e109db3ca2895277f1c854b248d2dd8b605b3c5c0a37540754ac974b29360bd

300 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.004 Unix Shell T1059.001 PowerShell T1059.003 Windows Command Shell

The sample utilizes Excel 4.0 macros and VBA to present a lure document, disguised as a DocuSign file, instructing the user to enable macros. Upon enabling, the VBA script `tres` constructs the URL `http://sanamlive.in/cfpybsgfmyja/5555555555.jpg` and uses `URLDownloadToFile` to download a second-stage payload. The presence of XLM Auto_Open and the use of `URLDownloadToFile` are strong indicators of a downloader malware.

Heuristics 7

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME

oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN

Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN

Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `2a1c7329c4c8792c67abecd81ffa3d95e2243efca26ae8a7b4838634109595bd`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	5046 bytes
`macros.bas` `aa55a18a3f33259e345c5e53649ac5f2f1d89d5667b734f6c8f841105e5741f2`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1692 bytes

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