MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 81553f2de290ddf3a7dd40e0a8877781c8ac8cfb0fe5d0159a2b3ce3eda4c6f6. 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


njrat


Vendor detections: 9


Intelligence 9 IOCs YARA 5 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 81553f2de290ddf3a7dd40e0a8877781c8ac8cfb0fe5d0159a2b3ce3eda4c6f6
SHA3-384 hash: d8278b5a72775627a8275e6a47d4bb30bdd04af09dfbd8d7d5238e01ff218dad7ebae942b7b097b4d286699d949873ef
SHA1 hash: 142e39015b9650a7b3e7d6a1f341e685367e1aba
MD5 hash: b6d3a8b29282b13aac2286a59e0d0c3b
humanhash: nevada-alaska-eighteen-blossom
File name:october.exe
Download: download sample
Signature njrat
Create hunting rule
File size:625'664 bytes
First seen:2020-10-20 08:34:22 UTC
Last seen:2020-10-25 21:42:10 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'663 x AgentTesla, 19'478 x Formbook, 12'208 x SnakeKeylogger)
ssdeep 12288:LQKqmlQ3J2iNj/V4+U0c1eBFUCVI7UzH8bKVuyLjjar9ZfFZk:WZ1z4+e0BaCVI7Uz
Threatray 60 similar samples on MalwareBazaar
TLSH 51D45AADB61072DFC867C9B2CA681C64EBA07877431BD2439063219DDE5E897DF201F2
Reporter abuse_ch
Tags:exe NjRAT RAT


Avatar
abuse_ch
NjRAT C2:
64.188.28.27:5551

Intelligence

File Origin
# of uploads :
2
# of downloads :
99
Origin country :
n/a
Vendor Threat Intelligence
Detection:
Njrat
Create hunting rule
Link:
https://www.capesandbox.com/analysis/73363/
Detection(s):
SecuriteInfo.com.MSIL.Kryptik.WZA.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Sending a UDP request
Creating a window
Unauthorized injection to a recently created process
Creating a file
Result
Threat name:
Njrat
Create hunting rule
Detection:
malicious
Classification:
spre.troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/497349
Signature
.NET source code contains potential unpacker
.NET source code references suspicious native API functions
Changes the view of files in windows explorer (hidden files and folders)
Contains functionality to log keystrokes (.Net Source)
Contains functionality to spread to USB devices (.Net source)
Creates autostart registry keys with suspicious names
Injects a PE file into a foreign processes
Machine Learning detection for dropped file
Machine Learning detection for sample
Malicious sample detected (through community Yara rule)
Modifies the windows firewall
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Uses netsh to modify the Windows network and firewall settings
Yara detected AntiVM_3
Yara detected Njrat
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 300876 Sample: october.exe Startdate: 20/10/2020 Architecture: WINDOWS Score: 100 54 Malicious sample detected (through community Yara rule) 2->54 56 Multi AV Scanner detection for submitted file 2->56 58 Yara detected AntiVM_3 2->58 60 9 other signatures 2->60 10 october.exe 3 2->10         started        13 server.exe 2 2->13         started        16 server.exe 2->16         started        18 server.exe 2 2->18         started        process3 file4 50 C:\Users\user\AppData\...\october.exe.log, ASCII 10->50 dropped 20 october.exe 3 2 10->20         started        72 Injects a PE file into a foreign processes 13->72 23 server.exe 13->23         started        25 server.exe 13->25         started        27 server.exe 16->27         started        29 server.exe 16->29         started        31 server.exe 16->31         started        33 server.exe 18->33         started        signatures5 process6 file7 48 C:\Users\user\AppData\Local\Temp\server.exe, PE32 20->48 dropped 35 server.exe 3 20->35         started        process8 signatures9 62 Multi AV Scanner detection for dropped file 35->62 64 Machine Learning detection for dropped file 35->64 66 Injects a PE file into a foreign processes 35->66 38 server.exe 4 2 35->38         started        42 server.exe 35->42         started        process10 dnsIp11 52 64.188.28.27, 5551 ASN-QUADRANET-GLOBALUS United States 38->52 68 Changes the view of files in windows explorer (hidden files and folders) 38->68 70 Creates autostart registry keys with suspicious names 38->70 44 netsh.exe 1 3 38->44         started        signatures12 process13 process14 46 conhost.exe 44->46         started       
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/81553f2de290ddf3a7dd40e0a8877781c8ac8cfb0fe5d0159a2b3ce3eda4c6f6/
Threat name:
ByteCode-MSIL.Backdoor.Remcos
Create hunting rule
Status:
Malicious
First seen:
2020-10-20 02:25:32 UTC
AV detection:
20 of 29 (68.97%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=qfkt6lpcsdo7hj65idqkrb3xqhekzdh3b7s5afm2fm6oh3ney33a._file
Verdict:
malicious
Similar samples:
0039b78d69f0c4d19035fdc8a5b3508c9a1f69cbb0a7011f2427febadb905aba
njrat
00b11363c9cd9f5e944789c5c8c8f190cb8952e572fcad351c10a0ffe4809765
njrat
08da1c7771ae637a3b09d9d636b97d6cefdd1794fe3de4ade9b676188e057370
njrat
21ac08fc21c99e9c3522c3555adc2e54fdada5297deda9f00304694a47e1a9e6
njrat
27b5d536586dc6363e030ebd72925191a36c502ba25948c7a56b38c8fd414bfa
njrat
82627d2ae3b9f73237e422cd9b5c90aa5ae978e897fae447f06c1ec23e83a778
njrat
b85e964144a64d78fc54b4e6bae83ba6e1c7179f0a820f361c27f58842b6940a
njrat
b99755b5ef8145a14c9997d0702cad519f1768978c5b985da7bfc720d7de4152
njrat
cd0133076bb2594d02cc1a9ef7976ce41006ebc60c7f84b64a8199b4801f2ec5
njrat
dd0034d34e27eec19757f2d0b46c617fad9f461380aae7c79cb9cfd5f1df0a45
njrat
+ 50 additional samples on MalwareBazaar
Result
Malware family:
n/a
Score:
  8/10
Tags:
persistence evasion
Link:
https://tria.ge/reports/201020-5x23jqm5ve/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Modifies service
Suspicious use of SetThreadContext
Adds Run key to start application
Drops startup file
Loads dropped DLL
Executes dropped EXE
Modifies Windows Firewall
Unpacked files
SH256 hash:
81553f2de290ddf3a7dd40e0a8877781c8ac8cfb0fe5d0159a2b3ce3eda4c6f6
MD5 hash:
b6d3a8b29282b13aac2286a59e0d0c3b
SHA1 hash:
142e39015b9650a7b3e7d6a1f341e685367e1aba
Link:
https://www.unpac.me/results/de3ab173-8f15-4509-84a4-44757ed9a77e/
SH256 hash:
8f23f792545d41a0fa657e6711b0e9943a369f6e508052d92043f79a89d1fe03
MD5 hash:
0b2c597ac814d36e4baa22ca541b2e4f
SHA1 hash:
083ebc4d502fa99f95e90c12c8aacfe6c7cd1761
Link:
https://www.unpac.me/results/de3ab173-8f15-4509-84a4-44757ed9a77e/
SH256 hash:
0b3f07d98d0acff53d2f4721846812d98c7b3e52c0ff13d1b67334edada38d5c
MD5 hash:
d6c399f1ec47562c31f13acfd8f86735
SHA1 hash:
98facaa463fc1e1e4204ef38a6095487e9297436
Link:
https://www.unpac.me/results/de3ab173-8f15-4509-84a4-44757ed9a77e/
SH256 hash:
bac5797bde4b2810766a40d95bcdb825ac5b395fcbadd139daa19a44a6cdc049
MD5 hash:
a92cc1f6e0a2742350dfda6726db14c0
SHA1 hash:
e5404e3ed46498deb8ad8966a774540c2b8e9c1e
Link:
https://www.unpac.me/results/de3ab173-8f15-4509-84a4-44757ed9a77e/
SH256 hash:
ec48170e9de44632227e5f3dbfc912bcc7510e6954c626446f9d7b36d78a0c41
MD5 hash:
d52bdb2c581465ad40f34455daf81573
SHA1 hash:
f64c82e23b772b9ceb41f8397c15963e6a728156
Detections:
win_njrat_w1
Create hunting rule
win_njrat_g1
Create hunting rule
Link:
https://www.unpac.me/results/de3ab173-8f15-4509-84a4-44757ed9a77e/
Parent samples :
df91e3d8c094bb91bbc717a36ff7d42302b5f362aedde2333fac71cd42010a28
b85e964144a64d78fc54b4e6bae83ba6e1c7179f0a820f361c27f58842b6940a
81553f2de290ddf3a7dd40e0a8877781c8ac8cfb0fe5d0159a2b3ce3eda4c6f6
6e112a24130b1ef283d6966f4f84a9011fea4747e56c1884f75d449540a7c8df
3c62c78790e9af4f08177ae16bced8501967a30658db2c46fd638e48cfbc9b56
9dcd9722bae8dd0260f641d522553454b3f7fbc8df49ebb989a9257f38f42cec
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/81553f2de290ddf3a7dd40e0a8877781c8ac8cfb0fe5d0159a2b3ce3eda4c6f6

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:CN_disclosed_20180208_c
Create hunting rule
Author:Florian Roth
Description:Detects malware from disclosed CN malware set
Reference:https://twitter.com/cyberintproject/status/961714165550342146
Rule name:IPPort_combo_mem
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
Rule name:Njrat
Create hunting rule
Author:JPCERT/CC Incident Response Group
Description:detect njRAT in memory
Rule name:Ping_Del_method_bin_mem
Create hunting rule
Author:James_inthe_box
Description:cmd ping IP nul del
Rule name:win_njrat_w1
Create hunting rule
Author:Brian Wallace @botnet_hunter
Description:Identify njRat

File information

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

Malspam

njrat

Executable exe 81553f2de290ddf3a7dd40e0a8877781c8ac8cfb0fe5d0159a2b3ce3eda4c6f6

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/73363/

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