Office (OLE) / .XLS malware analysis — malicious · a5cdabf24a793c7a

MALICIOUS

Office (OLE) / .XLS

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

MD5: 8f2d6511b837e8cd7dc78c5e90962d37 SHA-1: cb96735fabecd2188f5caf42282d48e02481d6e7 SHA-256: a5cdabf24a793c7a49f5019354f01966beab699404e0b110289ff31972563e1b

388 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic T1218.011 Signed Binary Proxy Execution: Rundll32

This XLS file contains a large VBA macro that utilizes WScript.Shell and CreateObject to execute PowerShell commands. The presence of 'SC_STR_POWERSHELL' and 'OLE_VBA_PS' heuristics confirms the use of PowerShell. The 'SE_LOLBIN_RUN_COMMAND' heuristic indicates that the document contains instructions for executing Windows script/execution tools. The macro's primary function appears to be downloading and executing a second-stage payload, a common technique for initial access.

Heuristics 10

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA
Reference to PowerShell high SC_STR_POWERSHELL

Reference to PowerShell
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND

Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Suspicious extracted artifact medium 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.
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `ba6e61984651d2121caa68e9718d3fe56264b5545dec6ffc65c3569f8eaa0b15`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	324084 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 shell/COM execution token(s).

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