jester | e038cd85c9da66e9517bba1e3af819a7cb1cf068fe955b8e125273d1e0533c2b

Analysis

max time kernel
120s
max time network
125s
platform
windows10_x64
resource
win10-en-20211104
submitted
04-12-2021 03:36

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General

Target

dab3afd4e25abdc582e6325f31257ee8.exe
Size

487KB
MD5

dab3afd4e25abdc582e6325f31257ee8
SHA1

88648132d7f0b1fe59da88c696016e3b1e496fa5
SHA256

e038cd85c9da66e9517bba1e3af819a7cb1cf068fe955b8e125273d1e0533c2b
SHA512

e75b6166812fa7fb5852438a8ee8b2ad0ac48ced215c1bf8990f662efb63777164a731d899ffa743baf45671f90ef2af18c87ea43c5da57b4092536948b8bfc2

Score

10^/10

jester fanyze collection spyware stealer

Malware Config

Extracted

Family

jester

Botnet

fanyze

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 2 IoCs

Processes:

Jester.exeTor.exe

pid process

3676 Jester.exe
1828 Tor.exe
Loads dropped DLL 8 IoCs

Processes:

Tor.exe

pid process

1828 Tor.exe
1828 Tor.exe
1828 Tor.exe
1828 Tor.exe
1828 Tor.exe
1828 Tor.exe
1828 Tor.exe
1828 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

pid	process
3676	Jester.exe
1828	Tor.exe

pid	process
1828	Tor.exe
1828	Tor.exe
1828	Tor.exe
1828	Tor.exe
1828	Tor.exe
1828	Tor.exe
1828	Tor.exe
1828	Tor.exe

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

Processes:

Jester.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-1042495040-510797905-2613508344-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Jester.exe
Key opened	\REGISTRY\USER\S-1-5-21-1042495040-510797905-2613508344-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Jester.exe
Key opened	\REGISTRY\USER\S-1-5-21-1042495040-510797905-2613508344-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Jester.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.

Processes:

flow ioc

7 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

flow	ioc
7	ip-api.com

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

Processes:

Jester.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\Description\System\CentralProcessor\0	Jester.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	Jester.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

Jester.exe

pid process

3676 Jester.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

Jester.exe

description pid process

Token: SeDebugPrivilege 3676 Jester.exe

pid	process
3676	Jester.exe

description	pid	process
Token: SeDebugPrivilege	3676	Jester.exe

Suspicious use of WriteProcessMemory 21 IoCs

Processes:

dab3afd4e25abdc582e6325f31257ee8.exeJester.execmd.execmd.exe

description	pid	process	target process
PID 1288 wrote to memory of 3676	1288	dab3afd4e25abdc582e6325f31257ee8.exe	Jester.exe
PID 1288 wrote to memory of 3676	1288	dab3afd4e25abdc582e6325f31257ee8.exe	Jester.exe
PID 3676 wrote to memory of 920	3676	Jester.exe	cmd.exe
PID 3676 wrote to memory of 920	3676	Jester.exe	cmd.exe
PID 920 wrote to memory of 3752	920	cmd.exe	chcp.com
PID 920 wrote to memory of 3752	920	cmd.exe	chcp.com
PID 920 wrote to memory of 3428	920	cmd.exe	netsh.exe
PID 920 wrote to memory of 3428	920	cmd.exe	netsh.exe
PID 920 wrote to memory of 3968	920	cmd.exe	findstr.exe
PID 920 wrote to memory of 3968	920	cmd.exe	findstr.exe
PID 3676 wrote to memory of 2144	3676	Jester.exe	cmd.exe
PID 3676 wrote to memory of 2144	3676	Jester.exe	cmd.exe
PID 2144 wrote to memory of 1440	2144	cmd.exe	chcp.com
PID 2144 wrote to memory of 1440	2144	cmd.exe	chcp.com
PID 2144 wrote to memory of 936	2144	cmd.exe	netsh.exe
PID 2144 wrote to memory of 936	2144	cmd.exe	netsh.exe
PID 2144 wrote to memory of 1248	2144	cmd.exe	findstr.exe
PID 2144 wrote to memory of 1248	2144	cmd.exe	findstr.exe
PID 3676 wrote to memory of 1828	3676	Jester.exe	Tor.exe
PID 3676 wrote to memory of 1828	3676	Jester.exe	Tor.exe
PID 3676 wrote to memory of 1828	3676	Jester.exe	Tor.exe

outlook_office_path 1 IoCs

Processes:

Jester.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-1042495040-510797905-2613508344-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Jester.exe

outlook_win_path 1 IoCs

Processes:

Jester.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-1042495040-510797905-2613508344-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Jester.exe

C:\Users\Admin\AppData\Local\Temp\dab3afd4e25abdc582e6325f31257ee8.exe
"C:\Users\Admin\AppData\Local\Temp\dab3afd4e25abdc582e6325f31257ee8.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1288
- C:\Users\Admin\AppData\Local\Temp\Jester.exe
  "C:\Users\Admin\AppData\Local\Temp\Jester.exe"
  2⤵
  - Executes dropped EXE
  - 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:3676
- - C:\Windows\SYSTEM32\cmd.exe
    "cmd.exe" /C chcp 65001 && netsh wlan show profile | findstr All
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:920
  - - C:\Windows\system32\chcp.com
      chcp 65001
      4⤵
      PID:3752
  - - C:\Windows\system32\netsh.exe
      netsh wlan show profile
      4⤵
      PID:3428
  - - C:\Windows\system32\findstr.exe
      findstr All
      4⤵
      PID:3968
- - C:\Windows\SYSTEM32\cmd.exe
    "cmd.exe" /C chcp 65001 && netsh wlan show profile name="65001" key=clear | findstr Key
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2144
  - - C:\Windows\system32\chcp.com
      chcp 65001
      4⤵
      PID:1440
  - - C:\Windows\system32\netsh.exe
      netsh wlan show profile name="65001" key=clear
      4⤵
      PID:936
  - - C:\Windows\system32\findstr.exe
      findstr Key
      4⤵
      PID:1248
- - C:\Users\Admin\AppData\Local\Temp\Tor\Tor.exe
    "C:\Users\Admin\AppData\Local\Temp\Tor\Tor.exe"
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    PID:1828

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Web Service

T1102

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\Jester.exe

MD5
b7061d79323a4795c17c4ddda7e46da4

SHA1
c529ceec64e01721078de2d710dc15d694918266

SHA256
3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853

SHA512
8c7e531c46f8a41021e73b2c10b19ab7ef90ea4f4d0ed8b2f65def2945be005aeae96c94fa5fde6225ed768fbc7c5bdb52654a6b5b2adaf88dc3700722675bf8

Download Submit
C:\Users\Admin\AppData\Local\Temp\Jester.exe

MD5
b7061d79323a4795c17c4ddda7e46da4

SHA1
c529ceec64e01721078de2d710dc15d694918266

SHA256
3168f18432106cfaf21f48598c1b26b1026de7a0bac69ae548c79dec67be7853

SHA512
8c7e531c46f8a41021e73b2c10b19ab7ef90ea4f4d0ed8b2f65def2945be005aeae96c94fa5fde6225ed768fbc7c5bdb52654a6b5b2adaf88dc3700722675bf8

Download Submit
C:\Users\Admin\AppData\Local\Temp\Tor\Tor.exe

MD5
67ab12cf6cabc14588e4f51b21c2134a

SHA1
32a4ff564f38bf4b62007e419f19c991e60d6e14

SHA256
f0aaae0364306bb7a4681d01935c96c2ac76b3576b7982990f86bcaf811a45ba

SHA512
2a1c67e9d23d6b050e35c5a8e159309cf598095239406c60a9f721fddc912e21afab7036cbd9f77197cc4241df5f8fa6aa9d7294762659178c6edeb4699d5bec

Download Submit
C:\Users\Admin\AppData\Local\Temp\Tor\libcrypto-1_1.dll

MD5
3406f79392c47a72bed2f0067b3ce466

SHA1
a8e2940d61fc840441c4e2a835959d197929ffdf

SHA256
e4b6b2ca32b1e2ba26959ec7380c4f117418d3a724f60494ff3cb81505fbf43d

SHA512
930d794aa8715dcd23fafbead7fe2ec95d2863783b4c52279870cad93d5b6cf02ba8a13e2653d2bf731e9882bf63f43a7e44788ce47505346be3fe8e8b872fa4

Download Submit
C:\Users\Admin\AppData\Local\Temp\Tor\libevent-2-1-7.dll

MD5
a3bf8e33948d94d490d4613441685eee

SHA1
75ed7f6e2855a497f45b15270c3ad4aed6ad02e2

SHA256
91c812a33871e40b264761f1418e37ebfeb750fe61ca00cbcbe9f3769a8bf585

SHA512
c20ef2efcacb5f8c7e2464de7fde68bf610ab2e0608ff4daed9bf676996375db99bee7e3f26c5bd6cca63f9b2d889ed5460ec25004130887cd1a90b892be2b28

Download Submit
C:\Users\Admin\AppData\Local\Temp\Tor\libgcc_s_sjlj-1.dll

MD5
bd40ff3d0ce8d338a1fe4501cd8e9a09

SHA1
3aae8c33bf0ec9adf5fbf8a361445969de409b49

SHA256
ebda776a2a353f8f0690b1c7706b0cdaff3d23e1618515d45e451fc19440501c

SHA512
404fb3c107006b832b8e900f6e27873324cd0a7946cdccf4ffeea365a725892d929e8b160379af9782bcd6cfeb4c3c805740e21280b42bb2ce8f39f26792e5a1

Download Submit
C:\Users\Admin\AppData\Local\Temp\Tor\libssl-1_1.dll

MD5
9e3d55fbf890c6cbffd836f2aef4ba31

SHA1
715890ba3bda3431470cca4f4bc492c0f63fa138

SHA256
e6f4cf41373e8770c670cf5e85461f25385314ed9d8a2b37381bc84f5c0dd5c0

SHA512
9848f28fd96c21dd054cbf3e722e56373696c1f7803c137afc7c7203325d9738fa6b984d95cd49ff78a6d95c8f9406f869af3c3783901da3cc003e2b09497d65

Download Submit
C:\Users\Admin\AppData\Local\Temp\Tor\libssp-0.dll

MD5
b77328da7cead5f4623748a70727860d

SHA1
13b33722c55cca14025b90060e3227db57bf5327

SHA256
46541d9e28c18bc11267630920b97c42f104c258b55e2f62e4a02bcd5f03e0e7

SHA512
2f1bd13357078454203092ed5ddc23a8baa5e64202fba1e4f98eacf1c3c184616e527468a96ff36d98b9324426dddfa20b62b38cf95c6f5c0dc32513ebace9e2

Download Submit
C:\Users\Admin\AppData\Local\Temp\Tor\libwinpthread-1.dll

MD5
19d7cc4377f3c09d97c6da06fbabc7dc

SHA1
3a3ba8f397fb95ed5df22896b2c53a326662fcc9

SHA256
228fcfe9ed0574b8da32dd26eaf2f5dbaef0e1bd2535cb9b1635212ccdcbf84d

SHA512
23711285352cdec6815b5dd6e295ec50568fab7614706bc8d5328a4a0b62991c54b16126ed9e522471d2367b6f32fa35feb41bfa77b3402680d9a69f53962a4a

Download Submit
C:\Users\Admin\AppData\Local\Temp\Tor\tor.exe

MD5
67ab12cf6cabc14588e4f51b21c2134a

SHA1
32a4ff564f38bf4b62007e419f19c991e60d6e14

SHA256
f0aaae0364306bb7a4681d01935c96c2ac76b3576b7982990f86bcaf811a45ba

SHA512
2a1c67e9d23d6b050e35c5a8e159309cf598095239406c60a9f721fddc912e21afab7036cbd9f77197cc4241df5f8fa6aa9d7294762659178c6edeb4699d5bec

Download Submit
C:\Users\Admin\AppData\Local\Temp\Tor\zlib1.dll

MD5
6f98da9e33cd6f3dd60950413d3638ac

SHA1
e630bdf8cebc165aa81464ff20c1d55272d05675

SHA256
219d9d5bf0de4c2251439c89dd5f2959ee582e7f9f7d5ff66a29c88753a3a773

SHA512
2983faaf7f47a8f79a38122aa617e65e7deddd19ba9a98b62acf17b48e5308099b852f21aaf8ca6fe11e2cc76c36eed7ffa3307877d4e67b1659fe6e4475205c

Download Submit
\Users\Admin\AppData\Local\Temp\Tor\libcrypto-1_1.dll

MD5
3406f79392c47a72bed2f0067b3ce466

SHA1
a8e2940d61fc840441c4e2a835959d197929ffdf

SHA256
e4b6b2ca32b1e2ba26959ec7380c4f117418d3a724f60494ff3cb81505fbf43d

SHA512
930d794aa8715dcd23fafbead7fe2ec95d2863783b4c52279870cad93d5b6cf02ba8a13e2653d2bf731e9882bf63f43a7e44788ce47505346be3fe8e8b872fa4

Download Submit
\Users\Admin\AppData\Local\Temp\Tor\libevent-2-1-7.dll

MD5
a3bf8e33948d94d490d4613441685eee

SHA1
75ed7f6e2855a497f45b15270c3ad4aed6ad02e2

SHA256
91c812a33871e40b264761f1418e37ebfeb750fe61ca00cbcbe9f3769a8bf585

SHA512
c20ef2efcacb5f8c7e2464de7fde68bf610ab2e0608ff4daed9bf676996375db99bee7e3f26c5bd6cca63f9b2d889ed5460ec25004130887cd1a90b892be2b28

Download Submit
\Users\Admin\AppData\Local\Temp\Tor\libgcc_s_sjlj-1.dll

MD5
bd40ff3d0ce8d338a1fe4501cd8e9a09

SHA1
3aae8c33bf0ec9adf5fbf8a361445969de409b49

SHA256
ebda776a2a353f8f0690b1c7706b0cdaff3d23e1618515d45e451fc19440501c

SHA512
404fb3c107006b832b8e900f6e27873324cd0a7946cdccf4ffeea365a725892d929e8b160379af9782bcd6cfeb4c3c805740e21280b42bb2ce8f39f26792e5a1

Download Submit
\Users\Admin\AppData\Local\Temp\Tor\libgcc_s_sjlj-1.dll

MD5
bd40ff3d0ce8d338a1fe4501cd8e9a09

SHA1
3aae8c33bf0ec9adf5fbf8a361445969de409b49

SHA256
ebda776a2a353f8f0690b1c7706b0cdaff3d23e1618515d45e451fc19440501c

SHA512
404fb3c107006b832b8e900f6e27873324cd0a7946cdccf4ffeea365a725892d929e8b160379af9782bcd6cfeb4c3c805740e21280b42bb2ce8f39f26792e5a1

Download Submit
\Users\Admin\AppData\Local\Temp\Tor\libssl-1_1.dll

MD5
9e3d55fbf890c6cbffd836f2aef4ba31

SHA1
715890ba3bda3431470cca4f4bc492c0f63fa138

SHA256
e6f4cf41373e8770c670cf5e85461f25385314ed9d8a2b37381bc84f5c0dd5c0

SHA512
9848f28fd96c21dd054cbf3e722e56373696c1f7803c137afc7c7203325d9738fa6b984d95cd49ff78a6d95c8f9406f869af3c3783901da3cc003e2b09497d65

Download Submit
\Users\Admin\AppData\Local\Temp\Tor\libssp-0.dll

MD5
b77328da7cead5f4623748a70727860d

SHA1
13b33722c55cca14025b90060e3227db57bf5327

SHA256
46541d9e28c18bc11267630920b97c42f104c258b55e2f62e4a02bcd5f03e0e7

SHA512
2f1bd13357078454203092ed5ddc23a8baa5e64202fba1e4f98eacf1c3c184616e527468a96ff36d98b9324426dddfa20b62b38cf95c6f5c0dc32513ebace9e2

Download Submit
\Users\Admin\AppData\Local\Temp\Tor\libwinpthread-1.dll

MD5
19d7cc4377f3c09d97c6da06fbabc7dc

SHA1
3a3ba8f397fb95ed5df22896b2c53a326662fcc9

SHA256
228fcfe9ed0574b8da32dd26eaf2f5dbaef0e1bd2535cb9b1635212ccdcbf84d

SHA512
23711285352cdec6815b5dd6e295ec50568fab7614706bc8d5328a4a0b62991c54b16126ed9e522471d2367b6f32fa35feb41bfa77b3402680d9a69f53962a4a

Download Submit
\Users\Admin\AppData\Local\Temp\Tor\zlib1.dll

MD5
6f98da9e33cd6f3dd60950413d3638ac

SHA1
e630bdf8cebc165aa81464ff20c1d55272d05675

SHA256
219d9d5bf0de4c2251439c89dd5f2959ee582e7f9f7d5ff66a29c88753a3a773

SHA512
2983faaf7f47a8f79a38122aa617e65e7deddd19ba9a98b62acf17b48e5308099b852f21aaf8ca6fe11e2cc76c36eed7ffa3307877d4e67b1659fe6e4475205c

Download Submit
memory/920-125-0x0000000000000000-mapping.dmp

Download
memory/936-131-0x0000000000000000-mapping.dmp

Download
memory/1248-132-0x0000000000000000-mapping.dmp

Download
memory/1440-130-0x0000000000000000-mapping.dmp

Download
memory/1828-152-0x0000000073400000-0x0000000073426000-memory.dmp

Filesize
152KB

Download
memory/1828-154-0x00000000738B0000-0x00000000739AB000-memory.dmp

Filesize
1004KB

Download
memory/1828-158-0x0000000000350000-0x0000000000763000-memory.dmp

Filesize
4.1MB

Download
memory/1828-156-0x0000000073430000-0x0000000073516000-memory.dmp

Filesize
920KB

Download
memory/1828-157-0x0000000073400000-0x0000000073426000-memory.dmp

Filesize
152KB

Download
memory/1828-155-0x00000000735B0000-0x00000000738A5000-memory.dmp

Filesize
3.0MB

Download
memory/1828-153-0x0000000000350000-0x0000000000763000-memory.dmp

Filesize
4.1MB

Download
memory/1828-133-0x0000000000000000-mapping.dmp

Download
memory/1828-151-0x00000000738B0000-0x00000000739AB000-memory.dmp

Filesize
1004KB

Download
memory/2144-129-0x0000000000000000-mapping.dmp

Download
memory/3428-127-0x0000000000000000-mapping.dmp

Download
memory/3676-121-0x0000020F2FF80000-0x0000020F2FF81000-memory.dmp

Filesize
4KB

Download
memory/3676-118-0x0000000000000000-mapping.dmp

Download
memory/3676-123-0x0000020F30370000-0x0000020F30372000-memory.dmp

Filesize
8KB

Download
memory/3676-124-0x0000020F4A620000-0x0000020F4A621000-memory.dmp

Filesize
4KB

Download
memory/3752-126-0x0000000000000000-mapping.dmp

Download
memory/3968-128-0x0000000000000000-mapping.dmp

Download