MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 8c38dbbc3834ab600313e6cd32e0e1a077726f002a608b5cbf9baa87ff11f90f. 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


RemcosRAT


Vendor detections: 11


Maldoc score: 9


Intelligence 11 IOCs YARA 12 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 8c38dbbc3834ab600313e6cd32e0e1a077726f002a608b5cbf9baa87ff11f90f
SHA3-384 hash: c45761a932a105ea1b991ba650e1079a5807f8ab958f87274ab232cbb2570e7da12d046b3a3fbc85b809187547c02cb1
SHA1 hash: e784d86a123ff452024780303be372966df32e5a
MD5 hash: 0e1137f6c82bd9f4545156ce8fa1bfb5
humanhash: berlin-oscar-winter-bakerloo
File name:parcel.xlsm
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:19'195 bytes
First seen:2021-03-09 11:44:42 UTC
Last seen:2021-03-09 13:32:50 UTC
File type:Excel file xlsm
MIME type:application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
ssdeep 384:HNArNOYUlM9z6p84cYgRrAPGLU9obkIXKaj:+sYxWpwYIM0woQUKs
TLSH 4B82DF1DC6B27C3ED5B2C83C441246F5A64914028E532D19A013E64F72E83AB52EEEAF
Reporter abuse_ch
Tags:DHL RAT RemcosRAT xlsm


Avatar
abuse_ch
Malspam distributing RemcosRAT:

HELO: dns.stemere.com
Sending IP: 185.69.60.145
From: DHL International Express <nancy@qair.com>
Subject: Shipment Delivery
Attachment: parcel.xlsm

RemcosRAT payload URL:
http://adelantosi.com/cp/parcel.exe

RemcosRAT C2:
calvinlarry3551.hopto.org:2240 (31.220.4.216)

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
OLE dump

MalwareBazaar was able to identify 11 sections in this file using oledump:

Section IDSection sizeSection name
A1422 bytesPROJECT
A262 bytesPROJECTwm
A3977 bytesVBA/Sheet1
A432774 bytesVBA/ThisWorkbook
A52650 bytesVBA/_VBA_PROJECT
A61243 bytesVBA/__SRP_0
A7135 bytesVBA/__SRP_1
A8436 bytesVBA/__SRP_2
A9163 bytesVBA/__SRP_3
A10522 bytesVBA/dir
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
AutoExecWorkbook_OpenRuns when the Excel Workbook is opened
SuspiciousShellMay run an executable file or a system command
SuspiciousChrMay attempt to obfuscate specific strings (use option --deobf to deobfuscate)
SuspiciousXorMay attempt to obfuscate specific strings (use option --deobf to deobfuscate)
SuspiciousHex StringsHex-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)

Intelligence

File Origin
# of uploads :
2
# of downloads :
114
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
parcel.xlsm
Verdict:
Malicious activity
Analysis date:
2021-03-09 11:50:49 UTC
Tags:
macros macros-on-open generated-doc loader rat remcos keylogger
Link:
https://app.any.run/tasks/9f0c1577-8589-4f0c-b189-7c71529f5889

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
File type:
application/vnd.ms-excel.sheet.macroEnabled.12
Has a screenshot:
False
Contains macros:
True
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/123165/
Detection(s):
Twinclams.EvilDoc.StringBuidlersEveryRoseHasItsThorn.20210308.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Creating a process with a hidden window
Launching a process
DNS request
Sending an HTTP GET request
Creating a file in the %AppData% directory
Creating a process from a recently created file
Creating a file in the %temp% subdirectories
Connection attempt
Creating a file in the %AppData% subdirectories
Unauthorized injection to a recently created process
Unauthorized injection to a recently created process by context flags manipulation
Setting a global event handler for the keyboard
Running batch commands by exploiting the app vulnerability
Result
Verdict:
Suspicious
File Type:
Excel File with Macro
Link:
https://app.docguard.net/8c38dbbc3834ab600313e6cd32e0e1a077726f002a608b5cbf9baa87ff11f90f/results/dashboard
Result
Verdict:
MALICIOUS
Details
Macro with Startup Hook
Detected macro logic that will automatically execute on document open. Most malware contains some execution hook.
Macro Contains Suspicious String
Detected a macro with a suspicious string. Suspicious strings include privileged function calls, obfuscations, odd registry keys, etc...
Document With No Content
Document contains little or no semantic information.
Result
Threat name:
Remcos
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/632671
Signature
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Contains functionality to capture and log keystrokes
Contains functionality to inject code into remote processes
Contains functionality to register a low level keyboard hook
Contains functionality to steal Chrome passwords or cookies
Contains functionality to steal Firefox passwords or cookies
Delayed program exit found
Detected Remcos RAT
Detected unpacking (changes PE section rights)
Detected unpacking (overwrites its own PE header)
Document contains an embedded VBA macro which may execute processes
Document contains an embedded VBA with many string operations indicating source code obfuscation
Document exploit detected (process start blacklist hit)
Encrypted powershell cmdline option found
Found malware configuration
Machine Learning detection for dropped file
Machine Learning detection for sample
Malicious sample detected (through community Yara rule)
Maps a DLL or memory area into another process
Multi AV Scanner detection for domain / URL
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Powershell drops PE file
Sigma detected: Microsoft Office Product Spawning Windows Shell
Sigma detected: Remcos
Uses dynamic DNS services
Yara detected Powershell download and execute
Yara detected Remcos RAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 365299 Sample: parcel.xlsm Startdate: 09/03/2021 Architecture: WINDOWS Score: 100 43 Multi AV Scanner detection for domain / URL 2->43 45 Found malware configuration 2->45 47 Malicious sample detected (through community Yara rule) 2->47 49 15 other signatures 2->49 9 EXCEL.EXE 57 13 2->9         started        process3 file4 33 C:\Users\user\Desktop\~$parcel.xlsm, data 9->33 dropped 61 Document exploit detected (process start blacklist hit) 9->61 13 cmd.exe 9->13         started        signatures5 process6 signatures7 63 Encrypted powershell cmdline option found 13->63 16 powershell.exe 12 7 13->16         started        process8 dnsIp9 37 adelantosi.com 213.136.74.10, 49165, 80 CONTABODE Germany 16->37 29 C:\Users\user\AppData\Roaming\WcFBA.exe, PE32 16->29 dropped 51 Powershell drops PE file 16->51 21 WcFBA.exe 11 16->21         started        file10 signatures11 process12 file13 31 C:\Users\user\AppData\...\y23m2azyni9mz.dll, PE32 21->31 dropped 53 Multi AV Scanner detection for dropped file 21->53 55 Detected unpacking (changes PE section rights) 21->55 57 Detected unpacking (overwrites its own PE header) 21->57 59 8 other signatures 21->59 25 WcFBA.exe 2 3 21->25         started        signatures14 process15 dnsIp16 39 calvinlarry3551.ddns.net 31.220.4.216, 2240 HOSTHATCHUS Germany 25->39 41 calvinlarry3551.hopto.org 25->41 35 C:\Users\user\AppData\Roaming\...\logs.dat, ASCII 25->35 dropped file17
Gathering data
Threat name:
Script-Macro.Trojan.Valyria
Create hunting rule
Status:
Malicious
First seen:
2021-03-09 01:14:47 UTC
AV detection:
17 of 46 (36.96%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=rq4nxpbygsvwaayt43gtfyhbub3xe3yafjqiwxf7tovip7yr7ehq._file
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:remcos macro rat
Link:
https://tria.ge/reports/210309-lhd4kcz7nj/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Modifies Internet Explorer settings
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
NSIS installer
Office loads VBA resources, possible macro or embedded object present
Enumerates physical storage devices
Suspicious use of SetThreadContext
Loads dropped DLL
Blocklisted process makes network request
Executes dropped EXE
Process spawned unexpected child process
Remcos
Malware Config
C2 Extraction:
calvinlarry3551.hopto.org:2240
calvinlarry3551.ddns.net:2240
Dropper Extraction:
http://adelantosi.com/cp/parcel.exe
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/8c38dbbc3834ab600313e6cd32e0e1a077726f002a608b5cbf9baa87ff11f90f

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:ach_RemcosRAT
Create hunting rule
Author:abuse.ch
Rule name:Chrome_stealer_bin_mem
Create hunting rule
Author:James_inthe_box
Description:Chrome in files like avemaria
Rule name:Email_stealer_bin_mem
Create hunting rule
Author:James_inthe_box
Description:Email in files like avemaria
Rule name:INDICATOR_SUSPICIOUS_EXE_UACBypass_EventViewer
Create hunting rule
Author:ditekSHen
Description:detects Windows exceutables potentially bypassing UAC using eventvwr.exe
Rule name:IPPort_combo_mem
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
Rule name:Keylog_bin_mem
Create hunting rule
Author:James_inthe_box
Description:Contains Keylog
Rule name:Parallax
Create hunting rule
Author:@bartblaze
Description:Identifies Parallax RAT.
Rule name:remcos_rat
Create hunting rule
Author:jeFF0Falltrades
Rule name:REMCOS_RAT_variants
Create hunting rule
Rule name:Select_from_enumeration
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
Rule name:SharedStrings
Create hunting rule
Author:Katie Kleemola
Description:Internal names found in LURK0/CCTV0 samples
Rule name:UAC_bypass_bin_mem
Create hunting rule
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.

Malspam

RemcosRAT

Excel file xlsm 8c38dbbc3834ab600313e6cd32e0e1a077726f002a608b5cbf9baa87ff11f90f

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/1056654/
  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/123165/

Comments