Office (OLE) / .XLS malware analysis — malicious · aefc76a6cca8f9b9

MALICIOUS

Office (OLE) / .XLS

81.0 KB Created: 2015-11-23 07:00:21 Authoring application: Microsoft Excel First seen: 2022-04-28

MD5: 7a2b2afb94c7a5ae18dd3456b559a7c0 SHA-1: e681f239b8bd63af26630410c340d83bad53fe10 SHA-256: aefc76a6cca8f9b903f78e9829b6da68b8e236ae00aba8218d8f4f1b236e2624

400 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The Excel file contains VBA macros that are automatically executed upon opening via the Workbook_Open event. Critical heuristics indicate the use of WScript.Shell and Shell() calls, which are commonly used to download and execute additional malicious payloads. The VBA code appears to be obfuscated, but the presence of these critical indicators strongly suggests a dropper functionality. The ClamAV detection as 'Xls.Malware.Dropper-29529' further supports this assessment.

Heuristics 9

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
ClamAV: Xls.Malware.Dropper-29529 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Dropper-29529
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` `c04b53aa00457d8fc3e26b5f69708b7a8e5716093d246e79d59463ecb7d76649`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	23901 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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