Office (OLE) malware analysis — malicious · 4def76cfce8a580c

MALICIOUS

Office (OLE)

343.0 KB Created: 2015-06-05 18:17:20

MD5: 1664a21b31abc809b41ef04bef2b83d3 SHA-1: e78ecacd1c0120899af55a08b221c2a26e8b1cec SHA-256: 4def76cfce8a580cec033f3a4771810de7cff54191f57dd58fea550c39fda8dc

508 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell

The sample contains a Workbook_Open VBA macro that attempts to execute an embedded PE executable. The macro uses ShellExecuteA to run 'rundll32' with arguments pointing to a DLL named 'omsh.dll' located in the user's temporary directory. This DLL is likely the embedded executable, which is then executed via the 'rundll32' command. The document also contains a lure instructing the user to copy clipboard content into a shell, further indicating an attempt to trick the user into executing malicious code.

Heuristics 15

Embedded PE executable critical OLE_EMBEDDED_EXE

MZ/PE header found inside document — possible embedded executable
Reference to CreateProcess API high SC_STR_CREATEPROCESS

Reference to CreateProcess API
Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
Reference to LoadLibrary API high SC_STR_LOADLIBRARY

Reference to LoadLibrary API
Reference to GetProcAddress API high SC_STR_GETPROCADDRESS

Reference to GetProcAddress API
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
Ole10Native package carries executable/script file type high OFFICE_PACKAGE_RISKY_FILE

OLE Package displayName or fullPath ends in an executable or script-capable extension. Even without UI extension spoofing, embedding a runnable payload inside an Office document is a high-risk delivery pattern.
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.
Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE

Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
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.
NOP-equivalent sled detected medium SC_NOP_EQUIV_SLED

Long run of 0x40 bytes
Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC

Reference to VirtualAlloc API
Reference to VirtualProtect API medium SC_STR_VIRTUALPROTECT

Reference to VirtualProtect API
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `d2233606c870b49b0cb48a4294912a57af28cda30621f31fbca9eaa7c4cdc249`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2074 bytes
`embedded_office_00001265.exe` `a649e81e137add17220deeb83c1963ae2abc010161c98b6e8d784c5a82df6722`	embedded-pe	Office MZ+PE at offset 0x1265	346523 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`ole10native_00.bin` `9d3027d937dbbc4b6c7d85c4c82e08654d1bc7c2787c7c4e9d8a4cbf11356580`	ole-package	OLE Ole10Native stream: MBD0132A5F4/Ole10Native	205073 bytes

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