isrstealer | a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00

Analysis

max time kernel
321s
max time network
342s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
02/12/2022, 06:13

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General

Target

a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe
Size

408KB
MD5

a5dad59342b10f77be163943a0627875
SHA1

4a7d1f2ce7293794b74dc9d00d6fa1393d07a213
SHA256

a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00
SHA512

f6722bfbb610f44199c2595129b38145a0125afa50df9fe015f4e29e2fe90200c18ad84928835eaf85a4e3f91bcd5fb262ad4c257421da35475a55173a0ff18b
SSDEEP

6144:v7l/Mts0sXrneChRWcSUEC8ctAom2C+do4ON1ZA0bYQpBuLGlY+6iPHS/ei:hMSeChscpEBctA2Q11aPQ3/6/ei

Score

10^/10

isrstealer 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 7 IoCs

resource	yara_rule
behavioral2/memory/4652-141-0x0000000000400000-0x0000000000459000-memory.dmp	family_isrstealer
behavioral2/memory/4652-144-0x0000000000400000-0x0000000000459000-memory.dmp	family_isrstealer
behavioral2/memory/4652-150-0x0000000000400000-0x0000000000459000-memory.dmp	family_isrstealer
behavioral2/files/0x000c000000022dd6-153.dat	family_isrstealer
behavioral2/files/0x000c000000022dd6-154.dat	family_isrstealer
behavioral2/files/0x000c000000022dd6-159.dat	family_isrstealer
behavioral2/files/0x000c000000022dd6-167.dat	family_isrstealer

NirSoft WebBrowserPassView 1 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/2844-166-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView

Nirsoft 1 IoCs

resource	yara_rule
behavioral2/memory/2844-166-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft

Executes dropped EXE 3 IoCs

pid	Process
4784	TOYTP.exe
4768	TOYTP.exe
2844	TOYTP.exe

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4652-135-0x0000000000400000-0x0000000000459000-memory.dmp	upx
behavioral2/memory/4652-139-0x0000000000400000-0x0000000000459000-memory.dmp	upx
behavioral2/memory/4652-141-0x0000000000400000-0x0000000000459000-memory.dmp	upx
behavioral2/memory/3824-138-0x0000000000400000-0x000000000040B000-memory.dmp	upx
behavioral2/memory/4652-144-0x0000000000400000-0x0000000000459000-memory.dmp	upx
behavioral2/memory/3824-145-0x0000000000400000-0x000000000040B000-memory.dmp	upx
behavioral2/memory/3824-146-0x0000000000400000-0x000000000040B000-memory.dmp	upx
behavioral2/memory/3824-149-0x0000000000400000-0x000000000040B000-memory.dmp	upx
behavioral2/memory/4652-150-0x0000000000400000-0x0000000000459000-memory.dmp	upx

Checks computer location settings 2 TTPs 2 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-1-5-21-2971393436-602173351-1645505021-1000\Control Panel\International\Geo\Nation	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000\Control Panel\International\Geo\Nation	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.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
T1081

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 1612 set thread context of 4652	1612	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	83
PID 1612 set thread context of 3824	1612	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	85
PID 4784 set thread context of 4768	4784	TOYTP.exe	91
PID 4768 set thread context of 2844	4768	TOYTP.exe	93

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
4784	TOYTP.exe
4784	TOYTP.exe
4784	TOYTP.exe
4784	TOYTP.exe
4784	TOYTP.exe
4784	TOYTP.exe
4784	TOYTP.exe
4784	TOYTP.exe

Suspicious use of SetWindowsHookEx 4 IoCs

pid	Process
1612	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe
4652	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe
3824	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe
4784	TOYTP.exe

Suspicious use of WriteProcessMemory 40 IoCs

description	pid	Process	procid_target
PID 1612 wrote to memory of 4652	1612	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	83
PID 1612 wrote to memory of 4652	1612	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	83
PID 1612 wrote to memory of 4652	1612	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	83
PID 1612 wrote to memory of 4652	1612	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	83
PID 1612 wrote to memory of 4652	1612	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	83
PID 1612 wrote to memory of 4652	1612	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	83
PID 1612 wrote to memory of 4652	1612	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	83
PID 1612 wrote to memory of 4652	1612	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	83
PID 1612 wrote to memory of 3824	1612	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	85
PID 1612 wrote to memory of 3824	1612	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	85
PID 1612 wrote to memory of 3824	1612	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	85
PID 1612 wrote to memory of 3824	1612	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	85
PID 1612 wrote to memory of 3824	1612	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	85
PID 1612 wrote to memory of 3824	1612	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	85
PID 1612 wrote to memory of 3824	1612	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	85
PID 1612 wrote to memory of 3824	1612	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	85
PID 3824 wrote to memory of 2040	3824	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	88
PID 3824 wrote to memory of 2040	3824	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	88
PID 3824 wrote to memory of 2040	3824	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	88
PID 4652 wrote to memory of 4784	4652	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	87
PID 4652 wrote to memory of 4784	4652	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	87
PID 4652 wrote to memory of 4784	4652	a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe	87
PID 4784 wrote to memory of 4768	4784	TOYTP.exe	91
PID 4784 wrote to memory of 4768	4784	TOYTP.exe	91
PID 4784 wrote to memory of 4768	4784	TOYTP.exe	91
PID 4784 wrote to memory of 4768	4784	TOYTP.exe	91
PID 4784 wrote to memory of 4768	4784	TOYTP.exe	91
PID 4784 wrote to memory of 4768	4784	TOYTP.exe	91
PID 4784 wrote to memory of 4768	4784	TOYTP.exe	91
PID 4784 wrote to memory of 4768	4784	TOYTP.exe	91
PID 4784 wrote to memory of 4768	4784	TOYTP.exe	91
PID 4784 wrote to memory of 4768	4784	TOYTP.exe	91
PID 4784 wrote to memory of 4768	4784	TOYTP.exe	91
PID 4784 wrote to memory of 4768	4784	TOYTP.exe	91
PID 4784 wrote to memory of 4768	4784	TOYTP.exe	91
PID 4768 wrote to memory of 2844	4768	TOYTP.exe	93
PID 4768 wrote to memory of 2844	4768	TOYTP.exe	93
PID 4768 wrote to memory of 2844	4768	TOYTP.exe	93
PID 4768 wrote to memory of 2844	4768	TOYTP.exe	93
PID 4768 wrote to memory of 2844	4768	TOYTP.exe	93

C:\Users\Admin\AppData\Local\Temp\a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe
"C:\Users\Admin\AppData\Local\Temp\a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1612
- C:\Users\Admin\AppData\Local\Temp\a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe
  "C:\Users\Admin\AppData\Local\Temp\a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe"
  2⤵
  - Checks computer location settings
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4652
- - C:\Users\Admin\AppData\Local\Temp\TOYTP.exe
    "C:\Users\Admin\AppData\Local\Temp\TOYTP.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4784
  - - C:\Users\Admin\AppData\Local\Temp\TOYTP.exe
      "C:\Users\Admin\AppData\Local\Temp\TOYTP.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of SetThreadContext
      Suspicious use of WriteProcessMemory
      PID:4768
    - - C:\Users\Admin\AppData\Local\Temp\TOYTP.exe
        
        "C:\Users\Admin\AppData\Local\Temp\TOYTP.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data.dmp
        5⤵
        Executes dropped EXE
        
        PID:2844
- C:\Users\Admin\AppData\Local\Temp\a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe
  "C:\Users\Admin\AppData\Local\Temp\a1773b654b8724ebe57bc5d10cf65d2dc031846ab6bd3c96167c25aa23788b00.exe"
  2⤵
  - Checks computer location settings
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3824
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\ELLUQ.bat" "
    3⤵
    PID:2040

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\ELLUQ.bat

Filesize
152B

MD5
5f88391307396bd801e5d983e4f96ac4

SHA1
d426f3dad0cd9f13287b263028ad4587f2b1d9c8

SHA256
2d6e24c71a3081416896765d09901744dbd541553af2d831f2a17f6f38ac4dec

SHA512
0cc65532264fe5541dc75016c080004c111fecfb97f2f0063984a89089d49ea07a1bf6c1fa9b835ad32cfa986bac82d171351c6cf2163598199588aefdb402f8

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

Filesize
320KB

MD5
ccc2260269cb43ddadda9444e3d112f7

SHA1
ddab46acc12d7c60a15fa363f88030f1dd539fcb

SHA256
8ca1bd039407381c33fb7ab570b6e95b0ce64b0d5ef64a1968f9b55647cc1911

SHA512
787d0b4f5d89b840a4917c78e46f963c8c96a96ec005b45d085222ef307c2a76f074c4a65ca033b038e1b7d1419c7cd3c5c5f3075c3ea24e546c68bdd7643fde

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

Filesize
320KB

MD5
ccc2260269cb43ddadda9444e3d112f7

SHA1
ddab46acc12d7c60a15fa363f88030f1dd539fcb

SHA256
8ca1bd039407381c33fb7ab570b6e95b0ce64b0d5ef64a1968f9b55647cc1911

SHA512
787d0b4f5d89b840a4917c78e46f963c8c96a96ec005b45d085222ef307c2a76f074c4a65ca033b038e1b7d1419c7cd3c5c5f3075c3ea24e546c68bdd7643fde

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

Filesize
320KB

MD5
ccc2260269cb43ddadda9444e3d112f7

SHA1
ddab46acc12d7c60a15fa363f88030f1dd539fcb

SHA256
8ca1bd039407381c33fb7ab570b6e95b0ce64b0d5ef64a1968f9b55647cc1911

SHA512
787d0b4f5d89b840a4917c78e46f963c8c96a96ec005b45d085222ef307c2a76f074c4a65ca033b038e1b7d1419c7cd3c5c5f3075c3ea24e546c68bdd7643fde

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

Filesize
320KB

MD5
ccc2260269cb43ddadda9444e3d112f7

SHA1
ddab46acc12d7c60a15fa363f88030f1dd539fcb

SHA256
8ca1bd039407381c33fb7ab570b6e95b0ce64b0d5ef64a1968f9b55647cc1911

SHA512
787d0b4f5d89b840a4917c78e46f963c8c96a96ec005b45d085222ef307c2a76f074c4a65ca033b038e1b7d1419c7cd3c5c5f3075c3ea24e546c68bdd7643fde

Download Submit
memory/2844-166-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/3824-146-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/3824-149-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/3824-145-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/3824-138-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4652-150-0x0000000000400000-0x0000000000459000-memory.dmp

Filesize
356KB

Download
memory/4652-144-0x0000000000400000-0x0000000000459000-memory.dmp

Filesize
356KB

Download
memory/4652-141-0x0000000000400000-0x0000000000459000-memory.dmp

Filesize
356KB

Download
memory/4652-139-0x0000000000400000-0x0000000000459000-memory.dmp

Filesize
356KB

Download
memory/4652-135-0x0000000000400000-0x0000000000459000-memory.dmp

Filesize
356KB

Download
memory/4768-161-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download
memory/4768-163-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download
memory/4768-164-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download
memory/4768-160-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download
memory/4768-158-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download
memory/4768-169-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download