Office (OLE) / .XLS malware analysis — malicious · 3d1f08a2c45d104f

MALICIOUS

Office (OLE) / .XLS

142.5 KB Created: 2006-09-28 05:33:49 Authoring application: Microsoft Excel

MD5: e6692d83c783915d89e8e844a26e9b25 SHA-1: 9cdede2c344f6d7d14641589e9eac51d6472cfec SHA-256: 3d1f08a2c45d104f613af88d024392b708c800ba704f4be6f5da0b0bcd641a0a

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The file contains VBA macros that are automatically executed upon opening the workbook, indicated by the Workbook_Open macro and OLE_VBA_PCODE_AUTOEXEC_EXEC heuristic. The script utilizes CreateObject to instantiate Wscript.Shell, which is then used to execute a batch file located at 'c:\programdata\rtyusdj.bat'. The script also contains a long, obfuscated string that appears to be a concatenation of multiple URLs, likely intended for downloading a second-stage payload. The CLAMAV_DETECTION heuristic further confirms its malicious nature, identifying it as a downloader.

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` `ffa342a8bb4eb541fe833e6254cf3f6e2f7d6f5436c011440a061030b6684f64`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	6473 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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