jester | b06cd56bcb2a95ff2861a0257778e3a8911a7a47d81545138f1257a233267f0b

Resubmissions

16-01-2022 12:57

220116-p6z8xafdg4 1

16-01-2022 12:54

220116-p48ghafdf7 10

Analysis

max time kernel
119s
max time network
119s
platform
windows7_x64
resource
win7-en-20211208
submitted
16-01-2022 12:54

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General

Target

b06cd56bcb2a95ff2861a0257778e3a8911a7a47d81545138f1257a233267f0b.exe
Size

241KB
MD5

7120733f34bb6d7ccf174779d3058d3f
SHA1

f2392bcadf03bc4c253a95199bf4be1947898255
SHA256

b06cd56bcb2a95ff2861a0257778e3a8911a7a47d81545138f1257a233267f0b
SHA512

c39778c1e678264c15f85db3b1628e3047375f0671bfa2d756efc053e74a7289f9bc5f5807c9e246e625bfe09bc3e9b8590a67fef2a0710032521225a693745e

Score

10^/10

jester fikuscode stealer

Malware Config

Extracted

Family

jester

Botnet

FikusCode

http://jesterdcuxzbey4xvlwwheoecpltru5be2mzuk4w7a7nrhckdjjhrbyd.onion/report/FikusCode

https://api.anonfiles.com/upload?token=d26d620842507144

Mutex

46378331-3729-449c-9a03-94f385d10a9c

Attributes

license_key
D1F0DE359CBD562CCF9326AEEEA8E64E

Signatures

Jester
Jester is an information stealer malware written in C#.
stealer jester
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000_Classes\Local Settings	rundll32.exe

Opens file in notepad (likely ransom note) 1 IoCs

ransomware

pid	Process
1736	NOTEPAD.EXE

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	428	b06cd56bcb2a95ff2861a0257778e3a8911a7a47d81545138f1257a233267f0b.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1560 wrote to memory of 1736	1560	rundll32.exe	31
PID 1560 wrote to memory of 1736	1560	rundll32.exe	31
PID 1560 wrote to memory of 1736	1560	rundll32.exe	31

C:\Users\Admin\AppData\Local\Temp\b06cd56bcb2a95ff2861a0257778e3a8911a7a47d81545138f1257a233267f0b.exe
"C:\Users\Admin\AppData\Local\Temp\b06cd56bcb2a95ff2861a0257778e3a8911a7a47d81545138f1257a233267f0b.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:428

C:\Windows\system32\rundll32.exe
"C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\AppData\Local\Temp\249872103\zmstage.exe.orig
1⤵
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:1560
- C:\Windows\system32\NOTEPAD.EXE
  "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Local\Temp\249872103\zmstage.exe.orig
  2⤵
  - Opens file in notepad (likely ransom note)
  PID:1736

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/428-54-0x0000000000F40000-0x0000000000F82000-memory.dmp

Filesize
264KB

Download
memory/428-55-0x0000000000F40000-0x0000000000F82000-memory.dmp

Filesize
264KB

Download
memory/428-56-0x000000001A740000-0x000000001A742000-memory.dmp

Filesize
8KB

Download
memory/1560-57-0x000007FEFBC11000-0x000007FEFBC13000-memory.dmp

Filesize
8KB

Download