isrstealer | cdff44668207a42d3e83721029d666d72482b696e2e6db8e8dbc4f8b3440370b

General

Target

cdff44668207a42d3e83721029d666d72482b696e2e6db8e8dbc4f8b3440370b.exe
Size

340KB
MD5

dfe4a1cd1e822fba707b9d20017d0084
SHA1

e273c86578c9207b08c5d0517438cef0677a0330
SHA256

cdff44668207a42d3e83721029d666d72482b696e2e6db8e8dbc4f8b3440370b
SHA512

7e57b2e54741952da97c0c82631aba1a16dcbc797ff8500b3ae0f4d431e2d73ba742fb41378a3e61cafc96829a3c1a37be7c339780ed640d3c5eb6c5bce62c49
SSDEEP

6144:PXUQPN4gKo6iLoHIZvHPfrDW/MAfxitOW3IVhoOtmKWJVSFS1/uLJI:PigKoBcHWry/bjI2IVu

Score

10^/10

isrstealer collection 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 4 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3440-135-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3440-137-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3440-149-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3440-156-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

Processes:

resource	yara_rule
behavioral2/memory/1464-154-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/1464-155-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1464-154-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/1464-155-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 9 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/4424-141-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4424-143-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4424-144-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4424-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4424-146-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1464-151-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1464-153-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1464-154-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1464-155-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Drops startup file 1 IoCs

Processes:

cdff44668207a42d3e83721029d666d72482b696e2e6db8e8dbc4f8b3440370b.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\zb72t6bIXt.lnk	cdff44668207a42d3e83721029d666d72482b696e2e6db8e8dbc4f8b3440370b.exe

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

Processes:

Cvtres.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	Cvtres.exe

Suspicious use of SetThreadContext 3 IoCs

Processes:

cdff44668207a42d3e83721029d666d72482b696e2e6db8e8dbc4f8b3440370b.exeCvtres.exe

description	pid	process	target process
PID 680 set thread context of 3440	680	cdff44668207a42d3e83721029d666d72482b696e2e6db8e8dbc4f8b3440370b.exe	Cvtres.exe
PID 3440 set thread context of 4424	3440	Cvtres.exe	Cvtres.exe
PID 3440 set thread context of 1464	3440	Cvtres.exe	Cvtres.exe

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

System Information Discovery
T1082
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Cvtres.exe

pid process

3440 Cvtres.exe

pid	process
3440	Cvtres.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

cdff44668207a42d3e83721029d666d72482b696e2e6db8e8dbc4f8b3440370b.exeCvtres.exe

description	pid	process	target process
PID 680 wrote to memory of 3440	680	cdff44668207a42d3e83721029d666d72482b696e2e6db8e8dbc4f8b3440370b.exe	Cvtres.exe
PID 680 wrote to memory of 3440	680	cdff44668207a42d3e83721029d666d72482b696e2e6db8e8dbc4f8b3440370b.exe	Cvtres.exe
PID 680 wrote to memory of 3440	680	cdff44668207a42d3e83721029d666d72482b696e2e6db8e8dbc4f8b3440370b.exe	Cvtres.exe
PID 680 wrote to memory of 3440	680	cdff44668207a42d3e83721029d666d72482b696e2e6db8e8dbc4f8b3440370b.exe	Cvtres.exe
PID 680 wrote to memory of 3440	680	cdff44668207a42d3e83721029d666d72482b696e2e6db8e8dbc4f8b3440370b.exe	Cvtres.exe
PID 680 wrote to memory of 3440	680	cdff44668207a42d3e83721029d666d72482b696e2e6db8e8dbc4f8b3440370b.exe	Cvtres.exe
PID 680 wrote to memory of 3440	680	cdff44668207a42d3e83721029d666d72482b696e2e6db8e8dbc4f8b3440370b.exe	Cvtres.exe
PID 3440 wrote to memory of 4424	3440	Cvtres.exe	Cvtres.exe
PID 3440 wrote to memory of 4424	3440	Cvtres.exe	Cvtres.exe
PID 3440 wrote to memory of 4424	3440	Cvtres.exe	Cvtres.exe
PID 3440 wrote to memory of 4424	3440	Cvtres.exe	Cvtres.exe
PID 3440 wrote to memory of 4424	3440	Cvtres.exe	Cvtres.exe
PID 3440 wrote to memory of 4424	3440	Cvtres.exe	Cvtres.exe
PID 3440 wrote to memory of 4424	3440	Cvtres.exe	Cvtres.exe
PID 3440 wrote to memory of 4424	3440	Cvtres.exe	Cvtres.exe
PID 3440 wrote to memory of 1464	3440	Cvtres.exe	Cvtres.exe
PID 3440 wrote to memory of 1464	3440	Cvtres.exe	Cvtres.exe
PID 3440 wrote to memory of 1464	3440	Cvtres.exe	Cvtres.exe
PID 3440 wrote to memory of 1464	3440	Cvtres.exe	Cvtres.exe
PID 3440 wrote to memory of 1464	3440	Cvtres.exe	Cvtres.exe
PID 3440 wrote to memory of 1464	3440	Cvtres.exe	Cvtres.exe
PID 3440 wrote to memory of 1464	3440	Cvtres.exe	Cvtres.exe
PID 3440 wrote to memory of 1464	3440	Cvtres.exe	Cvtres.exe

C:\Users\Admin\AppData\Local\Temp\cdff44668207a42d3e83721029d666d72482b696e2e6db8e8dbc4f8b3440370b.exe
"C:\Users\Admin\AppData\Local\Temp\cdff44668207a42d3e83721029d666d72482b696e2e6db8e8dbc4f8b3440370b.exe"
1⤵
- Drops startup file
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:680
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\Cvtres.exe
  "C:\Windows\Microsoft.NET\Framework\v2.0.50727\Cvtres.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3440
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\Cvtres.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\TKX0yq9v8q.ini"
    3⤵
    PID:4424
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\Cvtres.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\PYLAGmazPh.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:1464

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Email Collection

1

T1114

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\TKX0yq9v8q.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/680-133-0x00000000752E0000-0x0000000075891000-memory.dmp

Filesize
5.7MB

Download
memory/680-148-0x00000000752E0000-0x0000000075891000-memory.dmp

Filesize
5.7MB

Download
memory/680-132-0x00000000752E0000-0x0000000075891000-memory.dmp

Filesize
5.7MB

Download
memory/1464-153-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1464-150-0x0000000000000000-mapping.dmp

Download
memory/1464-151-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1464-155-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1464-154-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3440-135-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3440-156-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3440-137-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3440-134-0x0000000000000000-mapping.dmp

Download
memory/3440-149-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4424-140-0x0000000000000000-mapping.dmp

Download
memory/4424-146-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4424-145-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4424-144-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4424-143-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4424-141-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads