isrstealer | 797655701398c216d4a480d7833b4056f5310fd982a33e2cb82d6996c2caad01

General

Target

2308d3630fa484e5b6788ce53c27e110_JaffaCakes118.exe
Size

430KB
MD5

2308d3630fa484e5b6788ce53c27e110
SHA1

bf12b6af3550d5702eb0f2bc4b6edc67ac405122
SHA256

797655701398c216d4a480d7833b4056f5310fd982a33e2cb82d6996c2caad01
SHA512

25b6b0726e5b07f6407a5aa012577788e6a95f6121f4e1c84c731997a9602388a7a06b958ee425966f761c8112d70d00f79d77d44c68261708f3433d5bbe0395
SSDEEP

12288:bgYBNfEbQcSRBrqKgJq39UWlb/pzepGnW:bXBALjU9DrewnW

Score

10^/10

isrstealer discovery spyware stealer trojan upx

Malware Config

Signatures

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

ISR Stealer payload 1 IoCs

resource	yara_rule
behavioral2/files/0x000b000000023ba5-10.dat	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-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	2308d3630fa484e5b6788ce53c27e110_JaffaCakes118.exe

Executes dropped EXE 2 IoCs

pid	Process
3208	Server.exe
2968	Server.exe

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

Drops desktop.ini file(s) 2 IoCs

description	ioc	Process
File created	C:\Windows\assembly\Desktop.ini	2308d3630fa484e5b6788ce53c27e110_JaffaCakes118.exe
File opened for modification	C:\Windows\assembly\Desktop.ini	2308d3630fa484e5b6788ce53c27e110_JaffaCakes118.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3208 set thread context of 2968	3208	Server.exe	87

UPX packed file 5 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/2968-23-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2968-19-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2968-24-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2968-25-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2968-27-0x0000000000400000-0x0000000000453000-memory.dmp	upx

Drops file in Windows directory 3 IoCs

description	ioc	Process
File created	C:\Windows\assembly\Desktop.ini	2308d3630fa484e5b6788ce53c27e110_JaffaCakes118.exe
File opened for modification	C:\Windows\assembly\Desktop.ini	2308d3630fa484e5b6788ce53c27e110_JaffaCakes118.exe
File opened for modification	C:\Windows\assembly	2308d3630fa484e5b6788ce53c27e110_JaffaCakes118.exe

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 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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2308d3630fa484e5b6788ce53c27e110_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Server.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Server.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3208	Server.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 4884 wrote to memory of 3208	4884	2308d3630fa484e5b6788ce53c27e110_JaffaCakes118.exe	86
PID 4884 wrote to memory of 3208	4884	2308d3630fa484e5b6788ce53c27e110_JaffaCakes118.exe	86
PID 4884 wrote to memory of 3208	4884	2308d3630fa484e5b6788ce53c27e110_JaffaCakes118.exe	86
PID 3208 wrote to memory of 2968	3208	Server.exe	87
PID 3208 wrote to memory of 2968	3208	Server.exe	87
PID 3208 wrote to memory of 2968	3208	Server.exe	87
PID 3208 wrote to memory of 2968	3208	Server.exe	87
PID 3208 wrote to memory of 2968	3208	Server.exe	87
PID 3208 wrote to memory of 2968	3208	Server.exe	87
PID 3208 wrote to memory of 2968	3208	Server.exe	87
PID 3208 wrote to memory of 2968	3208	Server.exe	87

C:\Users\Admin\AppData\Local\Temp\2308d3630fa484e5b6788ce53c27e110_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\2308d3630fa484e5b6788ce53c27e110_JaffaCakes118.exe"
1⤵
- Checks computer location settings
- Drops desktop.ini file(s)
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4884
- C:\Users\Admin\AppData\Local\Temp\Server.exe
  "C:\Users\Admin\AppData\Local\Temp\Server.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3208
- - C:\Users\Admin\AppData\Local\Temp\Server.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\HmSNPuiuEQ.ini"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:2968

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

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

1

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\HmSNPuiuEQ.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

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

Filesize
208KB

MD5
3cdbf5ca2d043b60aa52e75a535b09b2

SHA1
4f42e772fd736849e897cce77b6ef19386bc2e6b

SHA256
7febcab69fcc0b60f93783d2b8b3e1df808024054f150cf6058c122c63d0cd82

SHA512
55e22c2790e11d1783708548ede661680dfea6cb9fe506476ec24162305034721fc4226361f622b5e478c984ae6f9c2390b96dfb677ceb88f671f73450f60cd7

Download Submit
memory/2968-27-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2968-23-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2968-19-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2968-24-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2968-25-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4884-5-0x0000000074AF0000-0x00000000750A1000-memory.dmp

Filesize
5.7MB

Download
memory/4884-2-0x0000000074AF0000-0x00000000750A1000-memory.dmp

Filesize
5.7MB

Download
memory/4884-0-0x0000000074AF2000-0x0000000074AF3000-memory.dmp

Filesize
4KB

Download
memory/4884-29-0x0000000074AF2000-0x0000000074AF3000-memory.dmp

Filesize
4KB

Download
memory/4884-30-0x0000000074AF0000-0x00000000750A1000-memory.dmp

Filesize
5.7MB

Download
memory/4884-1-0x0000000074AF0000-0x00000000750A1000-memory.dmp

Filesize
5.7MB

Download

Analysis

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