MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b861535f129ce740a26f50318c44e0405be62eaaa21f6366ec64368074d966cf. While MalwareBazaar tries to identify whether the sample provided is malicious or not, there is no guarantee that a sample in MalwareBazaar is malicious.

Database Entry



SilentBuilder


Vendor detections: 8


Maldoc score: 9


Intelligence 8 IOCs YARA 7 File information Comments

SHA256 hash: b861535f129ce740a26f50318c44e0405be62eaaa21f6366ec64368074d966cf
SHA3-384 hash: 782475c044cc498e50b319eafba5904ee55f2ed35b781a48f57d1945523b7d5c8dfe1bbf3099d1dcfeb894e96e360c21
SHA1 hash: 562b15600872a0f823c75a4015daa3d0bd6b2522
MD5 hash: 1ea1ef7c139f68cca609e9ec3a70b5ff
humanhash: yankee-shade-maine-edward
File name:SecuriteInfo.com.Heur.22173.4129
Download: download sample
Signature SilentBuilder
File size:169'472 bytes
First seen:2021-02-18 20:16:46 UTC
Last seen:Never
File type:Excel file xlsx
MIME type:application/vnd.ms-excel
ssdeep 3072:XScKoSsxzNDZLDZjlbR868O8KlVH3jiKq7uDphYHceXVhca+fMHLtyeGxcl8OUMX:CcKoSsxzNDZLDZjlbR868O8KlVH3jiKi
TLSH 12F3CF5F7659CC52DA48033454E38BE26317FC9AABB387867A4CF6262FB06D04E1A507
Reporter SecuriteInfoCom
Tags:SilentBuilder

Office OLE Information


This malware samples appears to be an Office document. The following table provides more information about this document using oletools and oledump.

OLE id
Maldoc score: 9
Application name is Microsoft Excel
Office document is in OLE format
OLE dump

MalwareBazaar was able to identify 3 sections in this file using oledump:

Section IDSection sizeSection name
14096 bytesDocumentSummaryInformation
24096 bytesSummaryInformation
3158489 bytesWorkbook
OLE vba

MalwareBazaar was able to extract and deobfuscate VBA script(s) the following information from OLE objects embedded in this file using olevba:

TypeKeywordDescription
AutoExecAuto_OpenRuns when the Excel Workbook is opened
Hex String54TT35345454
SuspiciousFORMULA.FILLMay modify Excel 4 Macro formulas at runtime
SuspiciousEXECMay run an executable file or a system
SuspiciousHex StringsHex-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)
SuspiciousBase64 StringsBase64-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)

Intelligence


File Origin
# of uploads :
1
# of downloads :
134
Origin country :
n/a
Vendor Threat Intelligence
Verdict:
Legit
File type:
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Has a screenshot:
False
Contains macros:
True
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
DNS request
Creating a process with a hidden window
Sending an HTTP GET request
Launching a process by exploiting the app vulnerability
Result
Verdict:
Malicious
File Type:
Legacy Office File
Payload URLs
URL
File name
http://www.iec.ch
WorkBook
Document image
Document image
Result
Verdict:
MALICIOUS
Details
Macro Execution Coercion
Detected a document that appears to social engineer the user into activating embedded logic.
Autostarting Excel Macro Sheet
Excel contains Macrosheet logic that will trigger automatically upon document open.
Result
Threat name:
Hidden Macro 4.0 Trickbot
Detection:
malicious
Classification:
troj.spyw.expl.evad
Score:
100 / 100
Signature
Allocates memory in foreign processes
C2 URLs / IPs found in malware configuration
Delayed program exit found
Document exploit detected (drops PE files)
Document exploit detected (process start blacklist hit)
Document exploit detected (UrlDownloadToFile)
Drops PE files to the user root directory
Found evasive API chain (trying to detect sleep duration tampering with parallel thread)
Found Excel 4.0 Macro with suspicious formulas
Found malicious Excel 4.0 Macro
Found malware configuration
Hijacks the control flow in another process
Multi AV Scanner detection for submitted file
Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)
Office process drops PE file
Sigma detected: Microsoft Office Product Spawning Windows Shell
Sigma detected: Suspicious Svchost Process
Snort IDS alert for network traffic (e.g. based on Emerging Threat rules)
Tries to detect virtualization through RDTSC time measurements
Tries to harvest and steal browser information (history, passwords, etc)
Writes to foreign memory regions
Yara detected Trickbot
Behaviour
Behavior Graph:
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 355056 Sample: SecuriteInfo.com.Heur.22173.4129 Startdate: 18/02/2021 Architecture: WINDOWS Score: 100 44 116.68.162.92 SDI-AS-IDPTSumberDataIndonesiaID Indonesia 2->44 54 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->54 56 Found malware configuration 2->56 58 Multi AV Scanner detection for submitted file 2->58 60 11 other signatures 2->60 10 EXCEL.EXE 84 41 2->10         started        15 taskeng.exe 1 2->15         started        signatures3 process4 dnsIp5 52 artifkt.com 199.204.248.138, 49165, 80 AS17054US United States 10->52 34 C:\Users\user34Dks.freas, PE32 10->34 dropped 36 C:\Users\user\AppData\Local\...\7[1].fbr, PE32 10->36 dropped 78 Document exploit detected (process start blacklist hit) 10->78 80 Document exploit detected (UrlDownloadToFile) 10->80 17 rundll32.exe 10->17         started        19 rundll32.exe 15->19         started        file6 signatures7 process8 process9 21 rundll32.exe 25 17->21         started        signatures10 62 Writes to foreign memory regions 21->62 64 Allocates memory in foreign processes 21->64 66 Delayed program exit found 21->66 24 wermgr.exe 4 10 21->24         started        28 wermgr.exe 21->28         started        process11 dnsIp12 46 200.52.147.93, 443, 49173, 49176 RedesyTelecomunicacionesHN Honduras 24->46 48 94.140.114.136, 443 NANO-ASLV Latvia 24->48 50 10 other IPs or domains 24->50 68 Hijacks the control flow in another process 24->68 70 Tries to harvest and steal browser information (history, passwords, etc) 24->70 72 Writes to foreign memory regions 24->72 30 svchost.exe 4 24->30         started        74 Tries to detect virtualization through RDTSC time measurements 28->74 76 Found evasive API chain (trying to detect sleep duration tampering with parallel thread) 28->76 signatures13 process14 file15 38 C:\Users\user\AppData\Local\...\Web Data.bak, SQLite 30->38 dropped 40 C:\Users\user\AppData\...\Login Data.bak, SQLite 30->40 dropped 42 C:\Users\user\AppData\Local\...\History.bak, SQLite 30->42 dropped 82 Tries to harvest and steal browser information (history, passwords, etc) 30->82 signatures16
Threat name:
Document-Word.Trojan.Heuristic
Status:
Malicious
First seen:
2021-02-18 20:17:06 UTC
AV detection:
6 of 48 (12.50%)
Threat level:
  2/5
Result
Malware family:
trickbot
Score:
  10/10
Tags:
family:trickbot botnet:rob59 banker macro trojan xlm
Behaviour
Checks processor information in registry
Enumerates system info in registry
Modifies Internet Explorer settings
Suspicious behavior: AddClipboardFormatListener
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Looks up external IP address via web service
Loads dropped DLL
Templ.dll packer
Process spawned unexpected child process
Trickbot
Malware Config
C2 Extraction:
194.5.249.156:443
142.202.191.164:443
193.8.194.96:443
45.155.173.242:443
108.170.20.75:443
185.163.45.138:443
94.140.114.136:443
134.119.186.202:443
200.52.147.93:443
45.230.244.20:443
186.250.157.116:443
186.137.85.76:443
36.94.62.207:443
182.253.107.34:443
Dropper Extraction:
http://artifkt.com/okmobi/certificate.php
Please note that we are no longer able to provide a coverage score for Virus Total.

YARA Signatures


MalwareBazaar uses YARA rules from several public and non-public repositories, such as YARAhub and Malpedia. Those are being matched against malware samples uploaded to MalwareBazaar as well as against any suspicious process dumps they may create. Please note that only results from TLP:CLEAR rules are being displayed.

Rule name:Email_stealer_bin_mem
Author:James_inthe_box
Description:Email in files like avemaria
Rule name:IPPort_combo_mem
Author:James_inthe_box
Description:IP and port combo
Rule name:multiple_concats_in_excel4_exec_enjoy_the_silence
Author:Will Metcalf
Description:Behold The Great And Powerful Match Iterator. Multiple Concats with register Function SILENT BUILDER EDITION
Reference:https://blog.reversinglabs.com/blog/excel-4.0-macros
Rule name:Select_from_enumeration
Author:James_inthe_box
Description:IP and port combo
Rule name:SharedStrings
Author:Katie Kleemola
Description:Internal names found in LURK0/CCTV0 samples
Rule name:SUSP_Excel4Macro_AutoOpen
Author:John Lambert @JohnLaTwC
Description:Detects Excel4 macro use with auto open / close
Rule name:UAC_bypass_bin_mem
Author:James_inthe_box
Description:UAC bypass in files like avemaria

File information


The table below shows additional information about this malware sample such as delivery method and external references.

Comments