Office (OLE) / .XLS malware analysis — malicious · 40431e3ed51b3805

MALICIOUS

Office (OLE) / .XLS

136.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2023-08-17

MD5: e2ea080eae95c122ac52d2b0bdaa7ae3 SHA-1: 61043156ea5292a16ec2968099cade07da887bea SHA-256: 40431e3ed51b38051e6bbb7d148ab467a016d7776b2143c64aa158bcd3195923

422 Risk Score

Malware Insights

MITRE ATT&CK

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

This XLS file contains VBA macros that are automatically executed upon opening, specifically via the Workbook_Open event. The macros utilize WScript.Shell and the Shell() function to download and execute a payload, as indicated by the 'OLE_VBA_HTTP_DROP_EXEC' heuristic. The obfuscated script content and the presence of a 'ClamAV: Xls.Malware.Valyria-10032137-0' detection further support its malicious nature.

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` `30544226528bd20b76a8500fcc6f87d8c3b78375055972d7ee6f0080764e5f81`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	32517 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 124 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.