isrstealer | 4d4e7a37101a9fa0810a3ff324a87c302a1328dcaeae6a9c637752e871a1a678

Analysis

max time kernel
119s
max time network
121s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
21-03-2024 17:31

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General

Target

dc35c41440704458ed7a60c0ac026f62.exe
Size

408KB
MD5

dc35c41440704458ed7a60c0ac026f62
SHA1

28459a2a602943fb5f44cb7424061c390fefb502
SHA256

4d4e7a37101a9fa0810a3ff324a87c302a1328dcaeae6a9c637752e871a1a678
SHA512

f522adf75f7915caf3a87551f4704303ddde487da920c6a2a762d4fc821f5c6749b2496cdd5b5193252eb97f01cdcc3dc77584be90e6833e32f2410b955f8081
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 5 IoCs

resource	yara_rule
behavioral1/memory/1664-365-0x0000000000400000-0x0000000000459000-memory.dmp	family_isrstealer
behavioral1/files/0x000b00000001224d-376.dat	family_isrstealer
behavioral1/files/0x000b00000001224d-408.dat	family_isrstealer
behavioral1/memory/1664-535-0x0000000000400000-0x0000000000459000-memory.dmp	family_isrstealer
behavioral1/memory/1664-538-0x0000000000400000-0x0000000000459000-memory.dmp	family_isrstealer

NirSoft WebBrowserPassView 2 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral1/memory/2732-424-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral1/memory/2732-428-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral1/memory/2732-424-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral1/memory/2732-428-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft

Executes dropped EXE 3 IoCs

pid	Process
896	EXIEY.exe
2608	EXIEY.exe
2732	EXIEY.exe

Loads dropped DLL 7 IoCs

pid	Process
1664	dc35c41440704458ed7a60c0ac026f62.exe
1664	dc35c41440704458ed7a60c0ac026f62.exe
1664	dc35c41440704458ed7a60c0ac026f62.exe
1664	dc35c41440704458ed7a60c0ac026f62.exe
1664	dc35c41440704458ed7a60c0ac026f62.exe
896	EXIEY.exe
2608	EXIEY.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
T1552.001
Reads user/profile data of web browsers 2 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

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1664-360-0x0000000000400000-0x0000000000459000-memory.dmp	upx
behavioral1/memory/1664-365-0x0000000000400000-0x0000000000459000-memory.dmp	upx
behavioral1/memory/1664-535-0x0000000000400000-0x0000000000459000-memory.dmp	upx
behavioral1/memory/1664-538-0x0000000000400000-0x0000000000459000-memory.dmp	upx

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2236 set thread context of 1664	2236	dc35c41440704458ed7a60c0ac026f62.exe	28
PID 896 set thread context of 2608	896	EXIEY.exe	30
PID 2608 set thread context of 2732	2608	EXIEY.exe	31

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

System Information Discovery
T1082

Modifies system certificate store 2 TTPs 4 IoCs

evasion spyware trojan

Install Root Certificate

T1553.004

Modify Registry

T1112

description	ioc	Process
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\ROOT\Certificates\CABD2A79A1076A31F21D253635CB039D4329A5E8\Blob = 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	EXIEY.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\DAC9024F54D8F6DF94935FB1732638CA6AD77C13	EXIEY.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\DAC9024F54D8F6DF94935FB1732638CA6AD77C13\Blob = 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	EXIEY.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\ROOT\Certificates\CABD2A79A1076A31F21D253635CB039D4329A5E8	EXIEY.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
896	EXIEY.exe
896	EXIEY.exe
896	EXIEY.exe
896	EXIEY.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
2236	dc35c41440704458ed7a60c0ac026f62.exe
1664	dc35c41440704458ed7a60c0ac026f62.exe
896	EXIEY.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2236 wrote to memory of 1664	2236	dc35c41440704458ed7a60c0ac026f62.exe	28
PID 2236 wrote to memory of 1664	2236	dc35c41440704458ed7a60c0ac026f62.exe	28
PID 2236 wrote to memory of 1664	2236	dc35c41440704458ed7a60c0ac026f62.exe	28
PID 2236 wrote to memory of 1664	2236	dc35c41440704458ed7a60c0ac026f62.exe	28
PID 2236 wrote to memory of 1664	2236	dc35c41440704458ed7a60c0ac026f62.exe	28
PID 2236 wrote to memory of 1664	2236	dc35c41440704458ed7a60c0ac026f62.exe	28
PID 2236 wrote to memory of 1664	2236	dc35c41440704458ed7a60c0ac026f62.exe	28
PID 2236 wrote to memory of 1664	2236	dc35c41440704458ed7a60c0ac026f62.exe	28
PID 1664 wrote to memory of 896	1664	dc35c41440704458ed7a60c0ac026f62.exe	29
PID 1664 wrote to memory of 896	1664	dc35c41440704458ed7a60c0ac026f62.exe	29
PID 1664 wrote to memory of 896	1664	dc35c41440704458ed7a60c0ac026f62.exe	29
PID 1664 wrote to memory of 896	1664	dc35c41440704458ed7a60c0ac026f62.exe	29
PID 896 wrote to memory of 2608	896	EXIEY.exe	30
PID 896 wrote to memory of 2608	896	EXIEY.exe	30
PID 896 wrote to memory of 2608	896	EXIEY.exe	30
PID 896 wrote to memory of 2608	896	EXIEY.exe	30
PID 896 wrote to memory of 2608	896	EXIEY.exe	30
PID 896 wrote to memory of 2608	896	EXIEY.exe	30
PID 896 wrote to memory of 2608	896	EXIEY.exe	30
PID 896 wrote to memory of 2608	896	EXIEY.exe	30
PID 896 wrote to memory of 2608	896	EXIEY.exe	30
PID 896 wrote to memory of 2608	896	EXIEY.exe	30
PID 896 wrote to memory of 2608	896	EXIEY.exe	30
PID 896 wrote to memory of 2608	896	EXIEY.exe	30
PID 2608 wrote to memory of 2732	2608	EXIEY.exe	31
PID 2608 wrote to memory of 2732	2608	EXIEY.exe	31
PID 2608 wrote to memory of 2732	2608	EXIEY.exe	31
PID 2608 wrote to memory of 2732	2608	EXIEY.exe	31
PID 2608 wrote to memory of 2732	2608	EXIEY.exe	31
PID 2608 wrote to memory of 2732	2608	EXIEY.exe	31

C:\Users\Admin\AppData\Local\Temp\dc35c41440704458ed7a60c0ac026f62.exe
"C:\Users\Admin\AppData\Local\Temp\dc35c41440704458ed7a60c0ac026f62.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2236
- C:\Users\Admin\AppData\Local\Temp\dc35c41440704458ed7a60c0ac026f62.exe
  "C:\Users\Admin\AppData\Local\Temp\dc35c41440704458ed7a60c0ac026f62.exe"
  2⤵
  - Loads dropped DLL
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1664
- - C:\Users\Admin\AppData\Local\Temp\EXIEY.exe
    "C:\Users\Admin\AppData\Local\Temp\EXIEY.exe"
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    - Suspicious use of SetThreadContext
    - Modifies system certificate store
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:896
  - - C:\Users\Admin\AppData\Local\Temp\EXIEY.exe
      "C:\Users\Admin\AppData\Local\Temp\EXIEY.exe"
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      Suspicious use of SetThreadContext
      Suspicious use of WriteProcessMemory
      PID:2608
    - - C:\Users\Admin\AppData\Local\Temp\EXIEY.exe
        
        "C:\Users\Admin\AppData\Local\Temp\EXIEY.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data.dmp
        5⤵
        Executes dropped EXE
        
        PID:2732

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Subvert Trust Controls

T1553

Install Root Certificate

T1553.004

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

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\LocalLow\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015

Filesize
67KB

MD5
753df6889fd7410a2e9fe333da83a429

SHA1
3c425f16e8267186061dd48ac1c77c122962456e

SHA256
b42dc237e44cbc9a43400e7d3f9cbd406dbdefd62bfe87328f8663897d69df78

SHA512
9d56f79410ad0cf852c74c3ef9454e7ae86e80bdd6ff67773994b48ccac71142bcf5c90635da6a056e1406e81e64674db9584928e867c55b77b59e2851cf6444

Download Submit
C:\Users\Admin\AppData\Local\Temp\Cab4BE1.tmp

Filesize
65KB

MD5
ac05d27423a85adc1622c714f2cb6184

SHA1
b0fe2b1abddb97837ea0195be70ab2ff14d43198

SHA256
c6456e12e5e53287a547af4103e0397cb9697e466cf75844312dc296d43d144d

SHA512
6d0ef9050e41fbae680e0e59dd0f90b6ac7fea5579ef5708b69d5da33a0ece7e8b16574b58b17b64a34cc34a4ffc22b4a62c1ece61f36c4a11a0665e0536b90d

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

Filesize
320KB

MD5
ccc2260269cb43ddadda9444e3d112f7

SHA1
ddab46acc12d7c60a15fa363f88030f1dd539fcb

SHA256
8ca1bd039407381c33fb7ab570b6e95b0ce64b0d5ef64a1968f9b55647cc1911

SHA512
787d0b4f5d89b840a4917c78e46f963c8c96a96ec005b45d085222ef307c2a76f074c4a65ca033b038e1b7d1419c7cd3c5c5f3075c3ea24e546c68bdd7643fde

Download Submit
C:\Users\Admin\AppData\Local\Temp\Tar4F13.tmp

Filesize
175KB

MD5
dd73cead4b93366cf3465c8cd32e2796

SHA1
74546226dfe9ceb8184651e920d1dbfb432b314e

SHA256
a6752b7851b591550e4625b832a393aabcc428de18d83e8593cd540f7d7cae22

SHA512
ce1bdd595065c94fa528badf4a6a8777893807d6789267612755df818ba6ffe55e4df429710aea29526ee4aa8ef20e25f2f05341da53992157d21ae032c0fb63

Download Submit
memory/1664-538-0x0000000000400000-0x0000000000459000-memory.dmp

Filesize
356KB

Download
memory/1664-360-0x0000000000400000-0x0000000000459000-memory.dmp

Filesize
356KB

Download
memory/1664-365-0x0000000000400000-0x0000000000459000-memory.dmp

Filesize
356KB

Download
memory/1664-535-0x0000000000400000-0x0000000000459000-memory.dmp

Filesize
356KB

Download
memory/2236-450-0x00000000024D0000-0x00000000024D1000-memory.dmp

Filesize
4KB

Download
memory/2236-431-0x0000000002370000-0x0000000002371000-memory.dmp

Filesize
4KB

Download
memory/2236-2-0x00000000001C0000-0x00000000001C1000-memory.dmp

Filesize
4KB

Download
memory/2236-132-0x0000000002370000-0x0000000002371000-memory.dmp

Filesize
4KB

Download
memory/2608-422-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download
memory/2608-413-0x0000000000400000-0x0000000000441000-memory.dmp

Filesize
260KB

Download
memory/2732-428-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/2732-424-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download