MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 a4ab58cc18771c7141e96d45714b7aeb046ff7173ec5266f08da7b28d411744e. 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: 9


Intelligence 9 IOCs YARA 7 File information Comments
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SHA256 hash: a4ab58cc18771c7141e96d45714b7aeb046ff7173ec5266f08da7b28d411744e
SHA3-384 hash: 9d8002b6a73adcb68070ffc6e88b641cbdbf42cb340c2879bef5818bc0f2beb9821d53dc1c7c5204f10adb6bfd8a91be
SHA1 hash: cf2c952dd7303167d7e666763dcf278088190f52
MD5 hash: 6d238a412f808d2c4c56865d7f4c4d16
humanhash: network-comet-echo-low
File name:6d238a412f808d2c4c56865d7f4c4d16.rtf
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:11'569 bytes
First seen:2021-01-19 07:58:57 UTC
Last seen:Never
File type:Rich Text Format (RTF) rtf
MIME type:text/rtf
ssdeep 192:OlJ+ZlqZLTN4cwQ89mj+YrqFKlkFiQZ7ItwBLuAugRXRxbHRVajbG9v8SxRFyprx:Ol20Z3acwQ8AoQQ9IiBLuAugRXzbRUfj
TLSH E032AF18C98486A4CB8DD1834503BF5E6879B6B861D34D967BCCEDF5BF5B81B5330405
Reporter abuse_ch
Tags:RemcosRAT rtf

Intelligence

File Origin
# of uploads :
1
# of downloads :
190
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
PO AR483-1590436 _ J-3000 PROJT.xlsx
Verdict:
Malicious activity
Analysis date:
2021-01-19 06:52:24 UTC
Tags:
encrypted opendir exploit CVE-2017-11882 loader trojan rat remcos keylogger
Link:
https://app.any.run/tasks/702b68a0-487c-47e7-a223-ad65ed8d5807

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection(s):
Sanesecurity.Malware.27301.RtfHeur.BadVer.UNOFFICIAL
Create hunting rule

SecuriteInfo.com.FakeRTF-2.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.RTFFakeVersionWithObjUpdateUKSurfMix.20200514.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Launching a process
Creating a window
Creating a file
DNS request
Sending a custom TCP request
Deleting a recently created file
Creating a file in the %AppData% subdirectories
Sending an HTTP GET request
Launching a file downloaded from the Internet
Enabling autorun with the standard Software\Microsoft\Windows\CurrentVersion\Run registry branch
Unauthorized injection to a recently created process
Setting a global event handler for the keyboard
Sending a TCP request to an infection source
Creating a process from a recently created file
Result
Verdict:
Malicious
File Type:
RTF File
Link:
https://app.docguard.net/a4ab58cc18771c7141e96d45714b7aeb046ff7173ec5266f08da7b28d411744e/results/dashboard
Result
Verdict:
MALICIOUS
Result
Threat name:
Remcos
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/584610
Signature
Allocates memory in foreign processes
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
Creates a thread in another existing process (thread injection)
Detected Remcos RAT
Drops PE files to the user root directory
Injects a PE file into a foreign processes
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for submitted file
Office equation editor drops PE file
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
Sigma detected: Droppers Exploiting CVE-2017-11882
Sigma detected: EQNEDT32.EXE connecting to internet
Sigma detected: Executables Started in Suspicious Folder
Sigma detected: Execution in Non-Executable Folder
Sigma detected: File Dropped By EQNEDT32EXE
Sigma detected: Suspicious Program Location Process Starts
Uses dynamic DNS services
Writes to foreign memory regions
Yara detected Remcos RAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 341339 Sample: T7gzTHDZ7g.rtf Startdate: 19/01/2021 Architecture: WINDOWS Score: 100 58 Malicious sample detected (through community Yara rule) 2->58 60 Multi AV Scanner detection for submitted file 2->60 62 Detected Remcos RAT 2->62 64 15 other signatures 2->64 7 EQNEDT32.EXE 12 2->7         started        12 Rvchnkop.exe 1 2->12         started        14 Rvchnkop.exe 2->14         started        16 WINWORD.EXE 291 23 2->16         started        process3 dnsIp4 42 192.3.22.59, 49165, 80 AS-COLOCROSSINGUS United States 7->42 32 C:\Users\user\AppData\...\Rsigned[1].exe, PE32 7->32 dropped 34 C:\Users\Public\vbc.exe, PE32 7->34 dropped 74 Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) 7->74 18 vbc.exe 1 8 7->18         started        44 dm-files.fe.1drv.com 12->44 46 4ubimq.am.files.1drv.com 12->46 48 1drv.ws 12->48 76 Writes to foreign memory regions 12->76 78 Allocates memory in foreign processes 12->78 80 Creates a thread in another existing process (thread injection) 12->80 23 ieinstal.exe 12->23         started        50 dm-files.fe.1drv.com 14->50 52 4ubimq.am.files.1drv.com 14->52 54 1drv.ws 14->54 82 Injects a PE file into a foreign processes 14->82 25 ieinstal.exe 14->25         started        file5 signatures6 process7 dnsIp8 36 1drv.ws 168.235.93.122, 443, 49166, 49172 RAMNODEUS United States 18->36 38 dm-files.fe.1drv.com 18->38 40 4ubimq.am.files.1drv.com 18->40 30 C:\Users\user\Links\Rvchnkop.exe, PE32 18->30 dropped 66 Writes to foreign memory regions 18->66 68 Allocates memory in foreign processes 18->68 70 Creates a thread in another existing process (thread injection) 18->70 72 Injects a PE file into a foreign processes 18->72 27 ieinstal.exe 2 3 18->27         started        file9 signatures10 process11 dnsIp12 56 4sureme.ddns.net 185.140.53.202, 4902, 49170, 49171 DAVID_CRAIGGG Sweden 27->56
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/a4ab58cc18771c7141e96d45714b7aeb046ff7173ec5266f08da7b28d411744e/
Threat name:
Document-RTF.Exploit.CVE-2017-11882
Create hunting rule
Status:
Malicious
First seen:
2021-01-19 07:59:03 UTC
AV detection:
19 of 45 (42.22%)
Threat level:
  5/5
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:modiloader family:remcos persistence rat trojan
Link:
https://tria.ge/reports/210119-eg8xz9yzej/
Behaviour
Launches Equation Editor
Modifies Internet Explorer settings
Modifies system certificate store
Script User-Agent
Suspicious behavior: AddClipboardFormatListener
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Office loads VBA resources, possible macro or embedded object present
Drops file in Windows directory
Adds Run key to start application
Loads dropped DLL
Uses the VBS compiler for execution
Blocklisted process makes network request
Executes dropped EXE
ModiLoader First Stage
ModiLoader, DBatLoader
Remcos
Malware Config
C2 Extraction:
4sureme.ddns.net:4902
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Bloodhound
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/a4ab58cc18771c7141e96d45714b7aeb046ff7173ec5266f08da7b28d411744e

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
Create hunting rule
Author:James_inthe_box
Description:Email in files like avemaria
Rule name:INDICATOR_RTF_EXPLOIT_CVE_2017_11882_4
Create hunting rule
Author:ditekSHen
Description:detects RTF variant documents potentially exploiting CVE-2018-0802 or CVE-2017-11882
Rule name:INDICATOR_RTF_MalVer_Objects
Create hunting rule
Author:ditekSHen
Description:Detects RTF documents with non-standard version and embeding one of the object mostly observed in exploit documents.
Rule name:IPPort_combo_mem
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
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.

Web download

RemcosRAT

Rich Text Format (RTF) rtf a4ab58cc18771c7141e96d45714b7aeb046ff7173ec5266f08da7b28d411744e

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/971529/
  
Delivery method
Distributed via web download

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