Office (OLE) / .XLS malware analysis — malicious · c5d3de05ae979f17

MALICIOUS

Office (OLE) / .XLS

176.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2023-09-11

MD5: f47e83421de7278b9e69b9ee4109b46d SHA-1: 33604e090aedfb8b5f25d674e6e129bb0a617cdb SHA-256: c5d3de05ae979f172612527eb099472aa182fff015ab59ea89c07d45f458ee90

422 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer T1204.002 Malicious File

The Workbook_Open macro in the VBA script utilizes WScript.Shell to access the user's Templates directory. It then proceeds to download and execute a second-stage payload, as indicated by the 'OLE_VBA_HTTP_DROP_EXEC' heuristic. The specific download URL and the executed payload are not fully discernible due to obfuscation and truncation, but the intent is clear.

Heuristics 10

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
ClamAV: Xls.Malware.Valyria-10032137-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Valyria-10032137-0
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.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Suspicious extracted artifact info 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `0b5e86d06c1fda60a0caa681f2472093b0621adedde020193a264b4f81df179a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	15677 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 69 long base64-like blob(s).

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