Office (OLE) / .XLS malware analysis — malicious · e847997f0901714a

MALICIOUS

Office (OLE) / .XLS

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

MD5: 71722c4f9794fe1f6b97cad66fc6a37b SHA-1: c849af63e5830dc6107b11095cb6eb73db24daec SHA-256: e847997f0901714a38c9e484a895db2fac80cb34634db3c8ab769d593c6b2a11

300 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell T1105 Ingress Tool Transfer

The sample is an Excel 4.0 macro-enabled spreadsheet designed to trick users into enabling macros, as indicated by the 'SE_ENABLE_LURE' heuristic and the document body content. The VBA script contains a call to URLDownloadToFile, which is used to download a file from a remote URL. The script reconstructs the URL as 'http://' + Sheets("Files").Range("B60"), and the DOC BODY lists several potential URLs. The presence of XLM Auto_Open with dangerous functions like RUN further supports its malicious intent to execute arbitrary code. The primary goal appears to be downloading and executing a second-stage payload.

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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