isrstealer | 4e5ca634aa01e8d36a453e351c0c15a9336454dc8ab9c2131d2fa70a2568de30

General

Target

JaffaCakes118_79818dfcc89bc05c035a7733b132a151.exe
Size

827KB
MD5

79818dfcc89bc05c035a7733b132a151
SHA1

0c929416597cee0bda7826f1d118e183f19b13e8
SHA256

4e5ca634aa01e8d36a453e351c0c15a9336454dc8ab9c2131d2fa70a2568de30
SHA512

b3ac16ff92eec0d0d478587c23a5086234fb025eea7ad167ab42ca705bb56e780a5d8359dfeed5ea0314fd25f853c7355e104d1db160f139b1e9e7a4272a1b78
SSDEEP

12288:StLt4absMaoEM4eKHsSlZdcHAf4aQ0icP+S2XDhCR6i/lCmf7T:o4abRTEpzQaIc2SEh5iomf7T

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 3 IoCs

resource	yara_rule
behavioral2/memory/4280-25-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/4280-21-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/4280-41-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer

Isrstealer 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-1-5-21-805952410-2104024357-1716932545-1000\Control Panel\International\Geo\Nation	JaffaCakes118_79818dfcc89bc05c035a7733b132a151.exe

Executes dropped EXE 3 IoCs

pid	Process
1660	lzVPP.exe
4280	cvtres.exe
3100	cvtres.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

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1660 set thread context of 4280	1660	lzVPP.exe	90
PID 4280 set thread context of 3100	4280	cvtres.exe	91

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral2/memory/3100-31-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3100-34-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3100-36-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3100-33-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3100-32-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3100-28-0x0000000000400000-0x0000000000453000-memory.dmp	upx

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	JaffaCakes118_79818dfcc89bc05c035a7733b132a151.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	lzVPP.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 2 IoCs

pid	Process
1660	lzVPP.exe
1660	lzVPP.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1660	lzVPP.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4280	cvtres.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 2332 wrote to memory of 1660	2332	JaffaCakes118_79818dfcc89bc05c035a7733b132a151.exe	89
PID 2332 wrote to memory of 1660	2332	JaffaCakes118_79818dfcc89bc05c035a7733b132a151.exe	89
PID 2332 wrote to memory of 1660	2332	JaffaCakes118_79818dfcc89bc05c035a7733b132a151.exe	89
PID 1660 wrote to memory of 4280	1660	lzVPP.exe	90
PID 1660 wrote to memory of 4280	1660	lzVPP.exe	90
PID 1660 wrote to memory of 4280	1660	lzVPP.exe	90
PID 1660 wrote to memory of 4280	1660	lzVPP.exe	90
PID 1660 wrote to memory of 4280	1660	lzVPP.exe	90
PID 1660 wrote to memory of 4280	1660	lzVPP.exe	90
PID 1660 wrote to memory of 4280	1660	lzVPP.exe	90
PID 1660 wrote to memory of 4280	1660	lzVPP.exe	90
PID 4280 wrote to memory of 3100	4280	cvtres.exe	91
PID 4280 wrote to memory of 3100	4280	cvtres.exe	91
PID 4280 wrote to memory of 3100	4280	cvtres.exe	91
PID 4280 wrote to memory of 3100	4280	cvtres.exe	91
PID 4280 wrote to memory of 3100	4280	cvtres.exe	91
PID 4280 wrote to memory of 3100	4280	cvtres.exe	91
PID 4280 wrote to memory of 3100	4280	cvtres.exe	91
PID 4280 wrote to memory of 3100	4280	cvtres.exe	91

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_79818dfcc89bc05c035a7733b132a151.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_79818dfcc89bc05c035a7733b132a151.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2332
- C:\Users\Admin\AppData\Local\Temp\lzVPP.exe
  "C:\Users\Admin\AppData\Local\Temp\lzVPP.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1660
- - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
    C:\Users\Admin\AppData\Local\Temp\\cvtres.exe
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4280
  - - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\DqiC93EPQh.ini"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      PID:3100

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\DqiC93EPQh.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
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\lzVPP.exe

Filesize
295KB

MD5
9ca3e71897b9d05b50364d5fc12dd42f

SHA1
62f92bcfe4cba70d4f51a4802986ce2763c249da

SHA256
254ed746d3c100bf853385f88ef0efe1e6e42df3c400a49268b97fd50a8e97e6

SHA512
b8c3904dd2dbf11adfd95c8c986d91dca2e2be6daa4b12d39774321853eec2869d49c62bea0ac855a8d1e8cfccaa4baf48b565430cdf4fa1901d2d41175aafa3

Download Submit
memory/1660-16-0x0000000074F60000-0x0000000075511000-memory.dmp

Filesize
5.7MB

Download
memory/1660-18-0x0000000074F60000-0x0000000075511000-memory.dmp

Filesize
5.7MB

Download
memory/1660-17-0x0000000074F60000-0x0000000075511000-memory.dmp

Filesize
5.7MB

Download
memory/1660-39-0x0000000074F60000-0x0000000075511000-memory.dmp

Filesize
5.7MB

Download
memory/2332-0-0x0000000074F62000-0x0000000074F63000-memory.dmp

Filesize
4KB

Download
memory/2332-1-0x0000000074F60000-0x0000000075511000-memory.dmp

Filesize
5.7MB

Download
memory/2332-2-0x0000000074F60000-0x0000000075511000-memory.dmp

Filesize
5.7MB

Download
memory/2332-15-0x0000000074F60000-0x0000000075511000-memory.dmp

Filesize
5.7MB

Download
memory/3100-32-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3100-34-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3100-36-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3100-33-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3100-31-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3100-28-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4280-21-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4280-25-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4280-41-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

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Analysis

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