isrstealer | 435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6

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 3 IoCs

resource	yara_rule
behavioral2/memory/1376-135-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/1376-144-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/1376-149-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4288-140-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4288-142-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4288-143-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4288-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4288-146-0x0000000000400000-0x0000000000453000-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-1-5-21-2386679933-1492765628-3466841596-1000\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 4960 set thread context of 1376	4960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	84
PID 1376 set thread context of 4288	1376	vbc.exe	85

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 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000_Classes\Local Settings	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe
Key created	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000_Classes\Local Settings	OpenWith.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1376	vbc.exe
2640	OpenWith.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 4960 wrote to memory of 1376	4960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	84
PID 4960 wrote to memory of 1376	4960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	84
PID 4960 wrote to memory of 1376	4960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	84
PID 4960 wrote to memory of 1376	4960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	84
PID 4960 wrote to memory of 1376	4960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	84
PID 4960 wrote to memory of 1376	4960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	84
PID 4960 wrote to memory of 1376	4960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	84
PID 4960 wrote to memory of 1376	4960	435e94a69cf878fcfb98b016a9477a7ac3714d596473d1d84d485d6f347803a6.exe	84
PID 1376 wrote to memory of 4288	1376	vbc.exe	85
PID 1376 wrote to memory of 4288	1376	vbc.exe	85
PID 1376 wrote to memory of 4288	1376	vbc.exe	85
PID 1376 wrote to memory of 4288	1376	vbc.exe	85
PID 1376 wrote to memory of 4288	1376	vbc.exe	85
PID 1376 wrote to memory of 4288	1376	vbc.exe	85
PID 1376 wrote to memory of 4288	1376	vbc.exe	85
PID 1376 wrote to memory of 4288	1376	vbc.exe	85

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
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4960
- 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\BCs8AWKnLi.ini"
    3⤵
    PID:4288

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:2640

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scripting

1

T1064

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

Scripting

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\BCs8AWKnLi.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1376-144-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/1376-149-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/1376-135-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4288-142-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4288-143-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4288-140-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4288-145-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4288-146-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4960-132-0x0000000074BF0000-0x00000000751A1000-memory.dmp

Filesize
5.7MB

Download
memory/4960-148-0x0000000074BF0000-0x00000000751A1000-memory.dmp

Filesize
5.7MB

Download
memory/4960-133-0x0000000074BF0000-0x00000000751A1000-memory.dmp

Filesize
5.7MB

Download

Analysis

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