MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 a03b45dabcaf812402454befd876b2eafbdf9e967f3bb01e66f33f3cabbdebd5. 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


ArkeiStealer


Vendor detections: 12


Intelligence 12 IOCs YARA 6 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: a03b45dabcaf812402454befd876b2eafbdf9e967f3bb01e66f33f3cabbdebd5
SHA3-384 hash: 237ddc929d4f22cca01328fa9fa07d471648cd2ace2a30cd643902fcaa6d02d767f5ca1fe50a1add07d63a20d2c8406a
SHA1 hash: 2344ad154e7d098704278cd5e28fccd29a9dec15
MD5 hash: 807a927252237ee6436724cbbcd05fa0
humanhash: potato-beryllium-single-sad
File name:SKBM-120821.exe
Download: download sample
Signature ArkeiStealer
Create hunting rule
File size:750'080 bytes
First seen:2021-08-13 05:49:04 UTC
Last seen:2021-08-13 06:53:02 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'740 x AgentTesla, 19'600 x Formbook, 12'241 x SnakeKeylogger)
ssdeep 12288:SPqqPtYaerpyXOSs1vJhzl7txF3gSEyI32u6Yaer:wMrpW6vfl7hpE7mmr
Threatray 2'443 similar samples on MalwareBazaar
TLSH T1A0F4CF781508962BEA3EC435A0590316F3AC8EE3F5CDCA63F4C3645294F222667D676E
dhash icon ccf0f0f0f4ccd4b2 (1 x NanoCore, 1 x ArkeiStealer, 1 x AZORult)
Reporter GovCERT_CH
Tags:ArkeiStealer exe

Intelligence

File Origin
# of uploads :
2
# of downloads :
114
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
SKBM-120821.exe
Verdict:
Malicious activity
Analysis date:
2021-08-13 05:52:03 UTC
Tags:
trojan stealer vidar loader
Link:
https://app.any.run/tasks/d4077cde-93df-4aea-8ac8-35b91654bb4a

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
Vidar
Create hunting rule
Link:
https://www.capesandbox.com/analysis/178826/
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
DNS request
Sending a UDP request
Creating a file in the %AppData% directory
Creating a file in the %temp% directory
Launching a process
Creating a process with a hidden window
Deleting a recently created file
Unauthorized injection to a recently created process
Creating a file
Connecting to a non-recommended domain
Connection attempt
Reading critical registry keys
Replacing files
Delayed writing of the file
Running batch commands
Using the Windows Management Instrumentation requests
Searching for the window
Stealing user critical data
Launching a tool to kill processes
Enabling autorun by creating a file
Result
Verdict:
MALICIOUS
Details
Windows PE Executable
Found a Windows Portable Executable (PE) binary. Depending on context, the presence of a binary is suspicious or malicious.
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/83df1de5-2155-44e0-b57d-6f48725ef5a2
Result
Threat name:
Oski Vidar
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/832156
Signature
.NET source code contains very large strings
Antivirus detection for URL or domain
Downloads files with wrong headers with respect to MIME Content-Type
Found malware configuration
Found many strings related to Crypto-Wallets (likely being stolen)
Injects a PE file into a foreign processes
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Posts data to a JPG file (protocol mismatch)
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Crypto Currency Wallets
Uses schtasks.exe or at.exe to add and modify task schedules
Yara detected AntiVM3
Yara detected Oski Stealer
Yara detected Vidar stealer
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 464587 Sample: SKBM-120821.exe Startdate: 13/08/2021 Architecture: WINDOWS Score: 100 43 Found malware configuration 2->43 45 Antivirus detection for URL or domain 2->45 47 Multi AV Scanner detection for dropped file 2->47 49 9 other signatures 2->49 8 SKBM-120821.exe 6 2->8         started        process3 file4 27 C:\Users\user\AppData\...\rFmqUFUNsPfqc.exe, PE32 8->27 dropped 29 C:\Users\user\AppData\Local\...\tmpB91D.tmp, XML 8->29 dropped 31 C:\Users\user\AppData\...\SKBM-120821.exe.log, ASCII 8->31 dropped 51 Uses schtasks.exe or at.exe to add and modify task schedules 8->51 53 Injects a PE file into a foreign processes 8->53 12 SKBM-120821.exe 193 8->12         started        17 schtasks.exe 1 8->17         started        signatures5 process6 dnsIp7 41 zau.divendesign.in 142.4.7.91, 49723, 80 UNIFIEDLAYER-AS-1US United States 12->41 33 C:\ProgramData\vcruntime140.dll, PE32 12->33 dropped 35 C:\ProgramData\sqlite3.dll, PE32 12->35 dropped 37 C:\ProgramData\softokn3.dll, PE32 12->37 dropped 39 4 other files (none is malicious) 12->39 dropped 55 Tries to harvest and steal browser information (history, passwords, etc) 12->55 57 Tries to steal Crypto Currency Wallets 12->57 19 cmd.exe 1 12->19         started        21 conhost.exe 17->21         started        file8 signatures9 process10 process11 23 taskkill.exe 1 19->23         started        25 conhost.exe 19->25         started       
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/a03b45dabcaf812402454befd876b2eafbdf9e967f3bb01e66f33f3cabbdebd5/
Threat name:
Win32.Trojan.Sabsik
Create hunting rule
Status:
Malicious
First seen:
2021-08-12 22:49:51 UTC
AV detection:
9 of 46 (19.57%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=ua5ulwv4v6asiasfjpx5q5vs5l557huwp453ahtg6m7tzk555pkq._file
Verdict:
malicious
Similar samples:
06c8a1e6544aede327bad32a5732d5bcfff143da73da01d34938efbe917e3289
ArkeiStealer
223dfd54929007ac23d6a20dbcf81a519a14f1c4061d23afcb761b75796042d2
ArkeiStealer
43460a1724b2521dd5e97c68c16edfce9caf22d49452efd956a64db91b5935a7
ArkeiStealer
436651743894169dc9cd4c7ef01734420a5ce2d6dcaf57825197e0c756feeee9
ArkeiStealer
44aa270e4c081241057bad8c1d0ea5864087325f8e3209aa10747f108123f718
ArkeiStealer
60d1297adb502d942493a794945336aea891d2c321476ef3349ac07726fca7c3
ArkeiStealer
69f41c2c444cd2147188d547c5edd6a4a8e2f238df52e1709dc7bb1066232ecc
ArkeiStealer
a34e7c63da647c394b8becde55d6e87bc34e2c934c89b7f23484747a3598fb4c
ArkeiStealer
+ 2'433 additional samples on MalwareBazaar
Result
Malware family:
oski
Create hunting rule
Score:
  10/10
Tags:
family:oski discovery infostealer spyware stealer suricata
Link:
https://tria.ge/reports/210813-1lxz5v62se/
Behaviour
Checks processor information in registry
Creates scheduled task(s)
Kills process with taskkill
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Suspicious use of SetThreadContext
Accesses cryptocurrency files/wallets, possible credential harvesting
Checks installed software on the system
Deletes itself
Loads dropped DLL
Reads user/profile data of web browsers
Downloads MZ/PE file
Oski
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
Malware Config
C2 Extraction:
zau.divendesign.in
Unpacked files
SH256 hash:
370c1888421092911490870dd86003ec698536fcc0c2a7ecbb6a90f59e04cbd6
MD5 hash:
6c3ed43c76bbb40ae03fa7d2f19a8603
SHA1 hash:
f91bc5fbaab6bcf309431348ba37615e5969fe85
Link:
https://www.unpac.me/results/ce0fcb22-c227-47bd-aa00-8578a8d9672f/
SH256 hash:
c362729899c5956cfa9fc3bcf9b21ac72066a1b84a497ceb1281f76e2f55c54b
MD5 hash:
0327d1374a5ce015ad9c83c5de76e823
SHA1 hash:
e521349d9e96a4191248747c42c78b6f88fc8f63
Link:
https://www.unpac.me/results/ce0fcb22-c227-47bd-aa00-8578a8d9672f/
SH256 hash:
bb3345900139f90a06e124c8412c62862c4f81000c8bd01b8e4db60a38e33352
MD5 hash:
f4c316fa4f6dc2f2cd347d8dd0b05947
SHA1 hash:
1323e5acd775c847e1c379cbdaa98975ceb1bd89
Detections:
win_oski_g0
Create hunting rule
win_oski_auto
Create hunting rule
Link:
https://www.unpac.me/results/ce0fcb22-c227-47bd-aa00-8578a8d9672f/
SH256 hash:
a03b45dabcaf812402454befd876b2eafbdf9e967f3bb01e66f33f3cabbdebd5
MD5 hash:
807a927252237ee6436724cbbcd05fa0
SHA1 hash:
2344ad154e7d098704278cd5e28fccd29a9dec15
Link:
https://www.unpac.me/results/ce0fcb22-c227-47bd-aa00-8578a8d9672f/
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/a03b45dabcaf/report/overview.html
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/a03b45dabcaf812402454befd876b2eafbdf9e967f3bb01e66f33f3cabbdebd5

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:MALWARE_Win_Vidar
Create hunting rule
Author:ditekSHen
Description:Detects Vidar / ArkeiStealer
Rule name:pe_imphash
Create hunting rule
Rule name:pe_imphash
Create hunting rule
Rule name:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash
Rule name:Vidar
Create hunting rule
Author:kevoreilly
Description:Vidar Payload
Rule name:win_oski_auto
Create hunting rule
Author:Felix Bilstein - yara-signator at cocacoding dot com
Description:Detects win.oski.

File information

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

Malspam

ArkeiStealer

Executable exe a03b45dabcaf812402454befd876b2eafbdf9e967f3bb01e66f33f3cabbdebd5

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/178826/

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