Office (OLE) / .XLS malware analysis — malicious · 9cd3ef217f992ed5

MALICIOUS

Office (OLE) / .XLS

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

MD5: af3fc400df989716813bb723ec72abdb SHA-1: eb4b032263d67b449d264c25ecd82d7f0037d09e SHA-256: 9cd3ef217f992ed5ca5cb0bed665792e5da3b200f5b5085111ea8b2aaff48a3e

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.004 Unix Shell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The file is an Excel XLS document containing both VBA and XLM macros. The presence of Workbook_Open and Auto_Open macros, along with heuristics indicating dangerous XLM functions like RUN, suggests the macros are designed to execute automatically. The document body and embedded URLs point to 'http://tak-tik.site/crun20.gif', which is likely used to download and execute a secondary payload. The 'SE_ENABLE_LURE' heuristic confirms the document attempts to trick the user into enabling macros.

Heuristics 8

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
XLM Auto_Open with dangerous formula APIs high 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.
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
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
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://tak-tik.site/crun20.gif�
- http://tak-tik.site/crun20.gif

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `d4222e1ad83b892546402a65bce1342319760d5f0e17d0c73ae5f07e792beb86`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	9447 bytes
`macros.bas` `c29faf2da8b6b84c63880f8f3ff09f138acdaa94ad9406cab75b546ae0e54428`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	979 bytes

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