isrstealer | 3deaae34fd6f0a22fe551022c36f6e099ebe23d4605f016299e64c140bfb1d47

General

Target

f97dcc1d1a01b072051b0e5c7c35b222_JaffaCakes118.exe
Size

344KB
MD5

f97dcc1d1a01b072051b0e5c7c35b222
SHA1

8dfe3aed3315d58c1be2b40b6210245985c1f660
SHA256

3deaae34fd6f0a22fe551022c36f6e099ebe23d4605f016299e64c140bfb1d47
SHA512

1b8824d3133b15f149059700f9160374494bf0f4ce4886160e6d014638d2a134cebd9bc281e7e2c5e3f567cc68e448f6735a06600c7974d6058877dd0bebd28a
SSDEEP

6144:Cduhp8wcIhNHKJ/zSUE4iCJz9iKKiG1KEg3QX7vebSgGweJ5YY35BzaJrLkaG66e:Cduf8wceeSUzkKKiGe3kmS1TJjrzaJ+g

Score

10^/10

isrstealer discovery persistence 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 3 IoCs

resource	yara_rule
behavioral2/memory/412-34-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral2/memory/412-21-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral2/memory/412-42-0x0000000000400000-0x0000000000414000-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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2392887640-1187051047-2909758433-1000\Control Panel\International\Geo\Nation	f97dcc1d1a01b072051b0e5c7c35b222_JaffaCakes118.exe

Executes dropped EXE 3 IoCs

pid	Process
2080	twitter.exe
412	cvtres.exe
4676	cvtres.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 3 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

Credentials from Web Browsers
T1555.003

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2392887640-1187051047-2909758433-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Twitter Live = "C:\\Users\\Admin\\AppData\\Local\\Temp\\twitter.exe"	twitter.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2080 set thread context of 412	2080	twitter.exe	85
PID 2368 set thread context of 4676	2368	f97dcc1d1a01b072051b0e5c7c35b222_JaffaCakes118.exe	86

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 4 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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	f97dcc1d1a01b072051b0e5c7c35b222_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	twitter.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cvtres.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cvtres.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
412	cvtres.exe
412	cvtres.exe
412	cvtres.exe
412	cvtres.exe
412	cvtres.exe
412	cvtres.exe
412	cvtres.exe
412	cvtres.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2080	twitter.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
412	cvtres.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 2368 wrote to memory of 2080	2368	f97dcc1d1a01b072051b0e5c7c35b222_JaffaCakes118.exe	84
PID 2368 wrote to memory of 2080	2368	f97dcc1d1a01b072051b0e5c7c35b222_JaffaCakes118.exe	84
PID 2368 wrote to memory of 2080	2368	f97dcc1d1a01b072051b0e5c7c35b222_JaffaCakes118.exe	84
PID 2368 wrote to memory of 4676	2368	f97dcc1d1a01b072051b0e5c7c35b222_JaffaCakes118.exe	86
PID 2368 wrote to memory of 4676	2368	f97dcc1d1a01b072051b0e5c7c35b222_JaffaCakes118.exe	86
PID 2368 wrote to memory of 4676	2368	f97dcc1d1a01b072051b0e5c7c35b222_JaffaCakes118.exe	86
PID 2080 wrote to memory of 412	2080	twitter.exe	85
PID 2080 wrote to memory of 412	2080	twitter.exe	85
PID 2080 wrote to memory of 412	2080	twitter.exe	85
PID 2080 wrote to memory of 412	2080	twitter.exe	85
PID 2080 wrote to memory of 412	2080	twitter.exe	85
PID 2080 wrote to memory of 412	2080	twitter.exe	85
PID 2080 wrote to memory of 412	2080	twitter.exe	85
PID 2080 wrote to memory of 412	2080	twitter.exe	85
PID 2368 wrote to memory of 4676	2368	f97dcc1d1a01b072051b0e5c7c35b222_JaffaCakes118.exe	86
PID 2368 wrote to memory of 4676	2368	f97dcc1d1a01b072051b0e5c7c35b222_JaffaCakes118.exe	86
PID 2368 wrote to memory of 4676	2368	f97dcc1d1a01b072051b0e5c7c35b222_JaffaCakes118.exe	86
PID 2368 wrote to memory of 4676	2368	f97dcc1d1a01b072051b0e5c7c35b222_JaffaCakes118.exe	86

C:\Users\Admin\AppData\Local\Temp\f97dcc1d1a01b072051b0e5c7c35b222_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\f97dcc1d1a01b072051b0e5c7c35b222_JaffaCakes118.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2368
- C:\Users\Admin\AppData\Local\Temp\twitter.exe
  "C:\Users\Admin\AppData\Local\Temp\twitter.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2080
- - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
    C:\Users\Admin\AppData\Local\Temp\cvtres.exe
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    PID:412
- C:\Users\Admin\AppData\Local\Temp\cvtres.exe
  C:\Users\Admin\AppData\Local\Temp\cvtres.exe
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  PID:4676

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

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\cvtres.exe

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

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

Filesize
60KB

MD5
eb5f21bcad7aa10e222d71890f729411

SHA1
4333182d709be1c983752e193e126fab2f7335bf

SHA256
396ae8d5f2203017a6b984ae3aba37cfb3f90070ce5839ed3d6edc347936c4b0

SHA512
a01b5c873feee324ef475afa386a055027d9e9f8e9ff37c3a77f85c2d1f2db9b5c8efbb4906c44d27d11a13fe7175474f4300b4eefa8e50de29383f85833b24a

Download Submit
memory/412-42-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/412-21-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/412-34-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/2080-17-0x0000000074B80000-0x0000000075131000-memory.dmp

Filesize
5.7MB

Download
memory/2080-35-0x0000000074B80000-0x0000000075131000-memory.dmp

Filesize
5.7MB

Download
memory/2080-20-0x0000000074B80000-0x0000000075131000-memory.dmp

Filesize
5.7MB

Download
memory/2368-0-0x0000000074B82000-0x0000000074B83000-memory.dmp

Filesize
4KB

Download
memory/2368-39-0x0000000074B80000-0x0000000075131000-memory.dmp

Filesize
5.7MB

Download
memory/2368-2-0x0000000074B80000-0x0000000075131000-memory.dmp

Filesize
5.7MB

Download
memory/2368-1-0x0000000074B80000-0x0000000075131000-memory.dmp

Filesize
5.7MB

Download
memory/4676-32-0x0000000000400000-0x0000000000473000-memory.dmp

Filesize
460KB

Download
memory/4676-33-0x0000000000400000-0x0000000000473000-memory.dmp

Filesize
460KB

Download
memory/4676-38-0x0000000000400000-0x0000000000473000-memory.dmp

Filesize
460KB

Download
memory/4676-28-0x0000000000400000-0x0000000000473000-memory.dmp

Filesize
460KB

Download
memory/4676-23-0x0000000000400000-0x0000000000473000-memory.dmp

Filesize
460KB

Download
memory/4676-43-0x0000000000400000-0x0000000000473000-memory.dmp

Filesize
460KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads