Office (OLE) / .XLSX malware analysis — malicious · 81bb69f6b9303685

MALICIOUS

Office (OLE) / .XLSX

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

MD5: eeceb6e777abdde5125e9fd2354bbddf SHA-1: 6a0f7259cae7aaa903db2b9cb5fe15c6e34d1ec7 SHA-256: 81bb69f6b93036858aad9a83d921599d3e69b60128e66c07dfdfea97f1ef4f03

280 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample contains VBA macros that execute Windows Script Host and create objects to run local files. Specifically, it attempts to execute 'c:\programdata\yhjlswle.vbs' and 'c:\programdata\ughldskbhn.bat'. The document body also contains obfuscated commands that appear to be constructing URLs for downloading additional payloads, including 'http://fullness-safety.com/-/P6x/' and 'https://nabajyotifoundation.com/da8uc7jo/4Za/'. The presence of a Workbook_Open macro and CreateObject calls strongly suggests a downloader functionality.

Heuristics 7

ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
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` `7a075e02dc1e88807280b9b84946715e79a3c091d50391301434649c77b78ea1`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	12808 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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