jester | 3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853

General

Target
3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853.exe
Size 456KB
Sample220309-jmr6ashghk
SHA256 3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853
MD5 b7061d79323a4795c17c4ddda7e46da4
SHA1 c529ceec64e01721078de2d710dc15d694918266
SHA512 8c7e531c46f8a41021e73b2c10b19ab7ef90ea4f4d0ed8b2f65def2945be005aeae96c94fa5fde6225ed768fbc7c5bdb52654a6b5b2adaf88dc3700722675bf8
MD5 SHA1 SHA512

Score

10^/10

jester fanyze collection spyware stealer

Malware Config

Extracted

Family

jester

Botnet

fanyze

C2

http://jesterdcuxzbey4xvlwwheoecpltru5be2mzuk4w7a7nrhckdjjhrbyd.onion/report/fanyze
https://api.anonfiles.com/upload?token=d26d620842507144

Mutex

f9999b04-5f6b-47c3-830e-f07171c30d02

Attributes

license_key
9A554B1F2269B7AF81AF6B074943117B

Signatures

Jester
Jester is an information stealer malware written in C#.
stealer jester

Executes dropped EXE 1 IoCs

pid	Process
1340	Tor.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-790714498-1549421491-1643397139-1000\Control Panel\International\Geo\Nation	3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853.exe

Loads dropped DLL 8 IoCs

pid	Process
1340	Tor.exe
1340	Tor.exe
1340	Tor.exe
1340	Tor.exe
1340	Tor.exe
1340	Tor.exe
1340	Tor.exe
1340	Tor.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-790714498-1549421491-1643397139-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853.exe
Key opened	\REGISTRY\USER\S-1-5-21-790714498-1549421491-1643397139-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853.exe
Key opened	\REGISTRY\USER\S-1-5-21-790714498-1549421491-1643397139-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
20	ip-api.com

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\Description\System\CentralProcessor\0	3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2068	PING.EXE

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
900	3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	900	3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 900 wrote to memory of 3768	900	3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853.exe	60
PID 900 wrote to memory of 3768	900	3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853.exe	60
PID 3768 wrote to memory of 3748	3768	cmd.exe	62
PID 3768 wrote to memory of 3748	3768	cmd.exe	62
PID 3768 wrote to memory of 1784	3768	cmd.exe	63
PID 3768 wrote to memory of 1784	3768	cmd.exe	63
PID 3768 wrote to memory of 1932	3768	cmd.exe	64
PID 3768 wrote to memory of 1932	3768	cmd.exe	64
PID 900 wrote to memory of 2080	900	3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853.exe	66
PID 900 wrote to memory of 2080	900	3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853.exe	66
PID 2080 wrote to memory of 3472	2080	cmd.exe	68
PID 2080 wrote to memory of 3472	2080	cmd.exe	68
PID 2080 wrote to memory of 1184	2080	cmd.exe	69
PID 2080 wrote to memory of 1184	2080	cmd.exe	69
PID 2080 wrote to memory of 2168	2080	cmd.exe	70
PID 2080 wrote to memory of 2168	2080	cmd.exe	70
PID 900 wrote to memory of 1340	900	3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853.exe	73
PID 900 wrote to memory of 1340	900	3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853.exe	73
PID 900 wrote to memory of 1340	900	3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853.exe	73
PID 900 wrote to memory of 3640	900	3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853.exe	75
PID 900 wrote to memory of 3640	900	3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853.exe	75
PID 3640 wrote to memory of 2944	3640	cmd.exe	77
PID 3640 wrote to memory of 2944	3640	cmd.exe	77
PID 3640 wrote to memory of 2068	3640	cmd.exe	78
PID 3640 wrote to memory of 2068	3640	cmd.exe	78

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-790714498-1549421491-1643397139-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-790714498-1549421491-1643397139-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853.exe

C:\Users\Admin\AppData\Local\Temp\3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853.exe
"C:\Users\Admin\AppData\Local\Temp\3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853.exe"
1⤵
- Checks computer location settings
- Accesses Microsoft Outlook profiles
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- outlook_office_path
- outlook_win_path
PID:900
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /C chcp 65001 && netsh wlan show profile | findstr All
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3768
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:3748
- - C:\Windows\system32\netsh.exe
    netsh wlan show profile
    3⤵
    PID:1784
- - C:\Windows\system32\findstr.exe
    findstr All
    3⤵
    PID:1932
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /C chcp 65001 && netsh wlan show profile name="65001" key=clear | findstr Key
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2080
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:3472
- - C:\Windows\system32\netsh.exe
    netsh wlan show profile name="65001" key=clear
    3⤵
    PID:1184
- - C:\Windows\system32\findstr.exe
    findstr Key
    3⤵
    PID:2168
- C:\Users\Admin\AppData\Local\Temp\Tor\Tor.exe
  "C:\Users\Admin\AppData\Local\Temp\Tor\Tor.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  PID:1340
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3640
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:2944
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:2068