isrstealer | d4dd47bfc05f6fd084597bcdeecadfb02f65fc3461dbf9d223460282f95e63bf

General

Target

de75ac5c0324a7048197ee04b5511858_JaffaCakes118.exe
Size

74KB
MD5

de75ac5c0324a7048197ee04b5511858
SHA1

3c9d4955acde6c0445cd843c9960e33cb88880b9
SHA256

d4dd47bfc05f6fd084597bcdeecadfb02f65fc3461dbf9d223460282f95e63bf
SHA512

6b3579a24c1c55cee98e96d964d85104486c7a3f39c7ebaed91beeb3f6a5ebd23a9719ff0df0e3f0617a64ecb70ae047908bd9c64fe1fac72fdafa205baf40cb
SSDEEP

1536:yfe1oWLJbWE9Jzu9SuugCQYCDmvE9Lt/Wg1qEOFq3bIxj7glg:oe1oWNdJzqRs5goybigg

Score

10^/10

isrstealer discovery spyware stealer trojan

Malware Config

Signatures

ISR Stealer
ISR Stealer is a modified version of Hackhound Stealer written in visual basic.
trojan stealer isrstealer

ISR Stealer payload 4 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4884-19-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral2/memory/4884-27-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral2/memory/4884-30-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral2/memory/4884-32-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer

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

Processes:

de75ac5c0324a7048197ee04b5511858_JaffaCakes118.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2412658365-3084825385-3340777666-1000\Control Panel\International\Geo\Nation	de75ac5c0324a7048197ee04b5511858_JaffaCakes118.exe

Executes dropped EXE 2 IoCs

Processes:

WorumKoRCyn.exewinhost.exe

pid process

3200 WorumKoRCyn.exe
4884 winhost.exe
Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
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
T1552.001
Suspicious use of SetThreadContext 1 IoCs

Processes:

WorumKoRCyn.exe

description pid process target process

PID 3200 set thread context of 4884 3200 WorumKoRCyn.exe winhost.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
3200	WorumKoRCyn.exe
4884	winhost.exe

description	pid	process	target process
PID 3200 set thread context of 4884	3200	WorumKoRCyn.exe	winhost.exe

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

Processes:

winhost.exede75ac5c0324a7048197ee04b5511858_JaffaCakes118.exeWorumKoRCyn.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	winhost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	de75ac5c0324a7048197ee04b5511858_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WorumKoRCyn.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

Processes:

winhost.exe

pid process

4884 winhost.exe
4884 winhost.exe
4884 winhost.exe
4884 winhost.exe
4884 winhost.exe
4884 winhost.exe
4884 winhost.exe
4884 winhost.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

WorumKoRCyn.exe

description pid process

Token: SeDebugPrivilege 3200 WorumKoRCyn.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

winhost.exe

pid process

4884 winhost.exe

pid	process
4884	winhost.exe
4884	winhost.exe
4884	winhost.exe
4884	winhost.exe
4884	winhost.exe
4884	winhost.exe
4884	winhost.exe
4884	winhost.exe

description	pid	process
Token: SeDebugPrivilege	3200	WorumKoRCyn.exe

pid	process
4884	winhost.exe

Suspicious use of WriteProcessMemory 11 IoCs

Processes:

de75ac5c0324a7048197ee04b5511858_JaffaCakes118.exeWorumKoRCyn.exe

description	pid	process	target process
PID 2088 wrote to memory of 3200	2088	de75ac5c0324a7048197ee04b5511858_JaffaCakes118.exe	WorumKoRCyn.exe
PID 2088 wrote to memory of 3200	2088	de75ac5c0324a7048197ee04b5511858_JaffaCakes118.exe	WorumKoRCyn.exe
PID 2088 wrote to memory of 3200	2088	de75ac5c0324a7048197ee04b5511858_JaffaCakes118.exe	WorumKoRCyn.exe
PID 3200 wrote to memory of 4884	3200	WorumKoRCyn.exe	winhost.exe
PID 3200 wrote to memory of 4884	3200	WorumKoRCyn.exe	winhost.exe
PID 3200 wrote to memory of 4884	3200	WorumKoRCyn.exe	winhost.exe
PID 3200 wrote to memory of 4884	3200	WorumKoRCyn.exe	winhost.exe
PID 3200 wrote to memory of 4884	3200	WorumKoRCyn.exe	winhost.exe
PID 3200 wrote to memory of 4884	3200	WorumKoRCyn.exe	winhost.exe
PID 3200 wrote to memory of 4884	3200	WorumKoRCyn.exe	winhost.exe
PID 3200 wrote to memory of 4884	3200	WorumKoRCyn.exe	winhost.exe

C:\Users\Admin\AppData\Local\Temp\de75ac5c0324a7048197ee04b5511858_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\de75ac5c0324a7048197ee04b5511858_JaffaCakes118.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2088
- C:\Users\Admin\AppData\Local\Temp\WorumKoRCyn.exe
  "C:\Users\Admin\AppData\Local\Temp\WorumKoRCyn.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3200
- - C:\Users\Admin\AppData\Local\Temp\winhost.exe
    C:\Users\Admin\AppData\Local\Temp\winhost.exe
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    PID:4884

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

2

T1552

Credentials In Files

2

T1552.001

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Data from Local System

2

T1005

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
64KB

MD5
cd14ae71afe756e1c1d21133bf3a1186

SHA1
7600be7aeb904f90fb3e911dea4532ccb97f601d

SHA256
15ccfb7cfbe0d790afcfeeb0eef0fb384facb14afc03ba3a1463d41ab2df467e

SHA512
0682ab4c5d03364d93db50072c33bf88bf383b07dac77cd4c2eae7864727e4f81a790c16e41ad73d878c89f17e73fdef66793bfdb691e74f8f84e64756bb975d

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

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

Download Submit
memory/2088-2-0x0000000075420000-0x00000000759D1000-memory.dmp

Filesize
5.7MB

Download
memory/2088-1-0x0000000075420000-0x00000000759D1000-memory.dmp

Filesize
5.7MB

Download
memory/2088-15-0x0000000075420000-0x00000000759D1000-memory.dmp

Filesize
5.7MB

Download
memory/2088-0-0x0000000075422000-0x0000000075423000-memory.dmp

Filesize
4KB

Download
memory/3200-18-0x0000000075420000-0x00000000759D1000-memory.dmp

Filesize
5.7MB

Download
memory/3200-24-0x0000000075420000-0x00000000759D1000-memory.dmp

Filesize
5.7MB

Download
memory/3200-26-0x0000000075420000-0x00000000759D1000-memory.dmp

Filesize
5.7MB

Download
memory/4884-19-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/4884-27-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/4884-30-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/4884-32-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads