Office (OLE) / .XLS malware analysis — malicious · 534112c4f60aa343

MALICIOUS

Office (OLE) / .XLS

150.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: 2147d7c54c5a5812cce8e9acf4f9fc72 SHA-1: a82e30803f26caf2e238e668fa7a496ab5dfd059 SHA-256: 534112c4f60aa343562f6dcdc77de05ea66735d4082d6a5f94726d6db2d82f29

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The critical ClamAV heuristic and high-severity heuristics for OLE_VBA_MACROS, OLE_VBA_WBOPEN, OLE_VBA_CREATEOBJ, and OLE_VBA_PCODE_AUTOEXEC_EXEC indicate malicious VBA code designed to execute. The Workbook_Open macro uses CreateObject to instantiate Wscript.Shell, which is then used to execute a batch file located at 'c:\programdata\jledshf.bat'. The script also contains obfuscated URLs that are likely used to download and execute a second-stage payload.

Heuristics 7

ClamAV: Doc.Downloader.EmotetExcel02226-9938630-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `006c4f4d54d1c9bb906763adb0bd849cdbbe9d88f3fa78ad2d18ef6987f96c37`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	8906 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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