isrstealer | 435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6

Analysis

max time kernel
49s
max time network
115s
platform
windows7_x64
resource
win7-20220901-en
resource tags

arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system
submitted
03-12-2022 01:47

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General

Target

435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe
Size

24.1MB
MD5

a4aa0526bcfab4393cbe31991b6c3a20
SHA1

fa3f78909efa1f5b84ee378a74bd45ea461e018f
SHA256

435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6
SHA512

dc27e9da39436f117787f605de0ecb52f0f520198fc6b67ffd13490051213a6084c7f8bdafd311ab7ec61d4565d4dbd3e909419c0ec328e1d9c44b55d81d222b
SSDEEP

98304:Z8QL5gL7rtWrIsR4Qos05TQ99pRRD38/6:ZZdgIl05+RRT8/

Score

10^/10

isrstealer persistence 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 5 IoCs

resource	yara_rule
behavioral1/memory/1376-60-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral1/memory/1376-62-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral1/memory/1376-63-0x0000000000401180-mapping.dmp	family_isrstealer
behavioral1/memory/1376-73-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral1/memory/1376-85-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1496-67-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1496-71-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1496-72-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1496-74-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1496-76-0x0000000000400000-0x0000000000453000-memory.dmp	upx

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Windows\CurrentVersion\Run\Startup Key = "C:\\Users\\Admin\\AppData\\Local\\Temp\\autostart.exe"	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 960 set thread context of 1376	960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	27
PID 1376 set thread context of 1496	1376	vbc.exe	28

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

System Information Discovery
T1082

Modifies registry class 13 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\.sql\ = "sql_auto_file"	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\sql_auto_file\shell	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\sql_auto_file\shell\edit\command	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\sql_auto_file\shell\edit\command\ = "%SystemRoot%\\SysWow64\\NOTEPAD.EXE %1"	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\sql_auto_file\shell\open	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\sql_auto_file\shell\open\command	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\sql_auto_file	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\sql_auto_file\	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\sql_auto_file\shell\open\command\ = "%SystemRoot%\\SysWow64\\NOTEPAD.EXE %1"	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\.sql	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\sql_auto_file\shell\edit	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_Classes\Local Settings	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\MuiCache	rundll32.exe

Opens file in notepad (likely ransom note) 1 IoCs

ransomware

pid	Process
1640	NOTEPAD.EXE

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1376	vbc.exe

Suspicious use of WriteProcessMemory 28 IoCs

description	pid	Process	procid_target
PID 960 wrote to memory of 1376	960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	27
PID 960 wrote to memory of 1376	960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	27
PID 960 wrote to memory of 1376	960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	27
PID 960 wrote to memory of 1376	960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	27
PID 960 wrote to memory of 1376	960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	27
PID 960 wrote to memory of 1376	960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	27
PID 960 wrote to memory of 1376	960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	27
PID 960 wrote to memory of 1376	960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	27
PID 1376 wrote to memory of 1496	1376	vbc.exe	28
PID 1376 wrote to memory of 1496	1376	vbc.exe	28
PID 1376 wrote to memory of 1496	1376	vbc.exe	28
PID 1376 wrote to memory of 1496	1376	vbc.exe	28
PID 1376 wrote to memory of 1496	1376	vbc.exe	28
PID 1376 wrote to memory of 1496	1376	vbc.exe	28
PID 1376 wrote to memory of 1496	1376	vbc.exe	28
PID 1376 wrote to memory of 1496	1376	vbc.exe	28
PID 1376 wrote to memory of 1496	1376	vbc.exe	28
PID 960 wrote to memory of 2020	960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	29
PID 960 wrote to memory of 2020	960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	29
PID 960 wrote to memory of 2020	960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	29
PID 960 wrote to memory of 2020	960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	29
PID 960 wrote to memory of 2020	960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	29
PID 960 wrote to memory of 2020	960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	29
PID 960 wrote to memory of 2020	960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	29
PID 2020 wrote to memory of 1640	2020	rundll32.exe	30
PID 2020 wrote to memory of 1640	2020	rundll32.exe	30
PID 2020 wrote to memory of 1640	2020	rundll32.exe	30
PID 2020 wrote to memory of 1640	2020	rundll32.exe	30

C:\Users\Admin\AppData\Local\Temp\435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe
"C:\Users\Admin\AppData\Local\Temp\435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:960
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1376
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\uP7l9vwJg4.ini"
    3⤵
    PID:1496
- C:\Windows\SysWOW64\rundll32.exe
  "C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\AppData\Local\Temp\setup.txt.sql
  2⤵
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:2020
- - C:\Windows\SysWOW64\NOTEPAD.EXE
    "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Local\Temp\setup.txt.sql
    3⤵
    - Opens file in notepad (likely ransom note)
    PID:1640

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scripting

T1064

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Scripting

T1064

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\setup.txt.sql

Filesize
3.7MB

MD5
7f465cdee8e271124da713804402edb4

SHA1
11a1e940c53c2a432e01c5f1e007f0848f070d86

SHA256
0505c966a8fb340385b6ed4764da894b63a15424a819143e08b0c807945c7682

SHA512
20aa6a53a85618d35106e96605873adc52774a279a8d9277f21daf09855802035718fb37c6f22e5e83357b46cc3f1468f875f40f2eafc5ddb9894f8cb2813beb

Download Submit
C:\Users\Admin\AppData\Local\Temp\uP7l9vwJg4.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/960-78-0x00000000749D0000-0x0000000074F7B000-memory.dmp

Filesize
5.7MB

Download
memory/960-55-0x00000000749D0000-0x0000000074F7B000-memory.dmp

Filesize
5.7MB

Download
memory/960-56-0x00000000023D5000-0x00000000023E6000-memory.dmp

Filesize
68KB

Download
memory/960-54-0x00000000757A1000-0x00000000757A3000-memory.dmp

Filesize
8KB

Download
memory/960-79-0x00000000023D5000-0x00000000023E6000-memory.dmp

Filesize
68KB

Download
memory/1376-60-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/1376-85-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/1376-57-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/1376-58-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/1376-73-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/1376-62-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/1496-76-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1496-74-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1496-67-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1496-72-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1496-71-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download