Malware Analysis Possible Supply Chain on Ooma

Sandbox Breaker

Level 9
Thread author
Well-known
Jan 6, 2022
389
One of my clients had an edr alerts from Ooma Office. After investigation we believe it's a part of an early Supply Chain attack. The process was Dormant until after 5pm business hours when it started spawning lolbins and doing discovery actions.

Vt says 2 engines. Their main installer is signed but the omma office.exe process isn't. Certificate chain issue with the file also. Very low file prevelance and defender flags it with two detections. I'm thinking there may be some hidden shell code in it. This reminds me of the 3cx VoIP hack. ea649ee7430b61db82c8f23470f27f956baf88a245f159af96ea49159c2656e6 | Triage
1000020387.png
1000020391.png
1000020390.png
 

Xeno1234

Level 13
Jun 12, 2023
640
I put this into a few sandboxes to see if there any any detections. All come out fully clean and dont appear to show the file doing anything at all. Sophos Intelix says the code execution cannot continue for "omma office.exe" as its missing ffmpeg.dll. Not saying its not malicious, just is possibly broken on some systems, sandbox evasive, or extremely evasive in general.

In Kaspersky Opentip, "omma office.exe", it shows strings that look like this. Seems encrypted or something of that matter to me.
1701485670862.png

1701485384188.png
 
Last edited:

Sandbox Breaker

Level 9
Thread author
Well-known
Jan 6, 2022
389
I put this into a few sandboxes to see if there any any detections. All come out fully clean and dont appear to show the file doing anything at all. Sophos Intelix says the code execution cannot continue for "omma office.exe" as its missing ffmpeg.dll. Not saying its not malicious, just is possibly broken on some systems, sandbox evasive, or extremely evasive in general.

In Kaspersky Opentip, "omma office.exe", it shows strings that look like this. Seems encrypted or something of that matter to me.
View attachment 279968
View attachment 279967
Yeah I'll be speaking to the devs. To many suspicious indicators. There is circumstacial and technical evidence that this isn't normal.
 

Xeno1234

Level 13
Jun 12, 2023
640
Yeah I'll be speaking to the devs. To many suspicious indicators. There is circumstacial and technical evidence that this isn't normal.
Yep. Those string’s definitely aren’t normal for a legitimate file. Defender also flagging it probably doesn’t help its case either. Kaspersky said this file has around 100 users and it’s trust level is unknown.
 

About us

  • MalwareTips is a community-driven platform providing the latest information and resources on malware and cyber threats. Our team of experienced professionals and passionate volunteers work to keep the internet safe and secure. We provide accurate, up-to-date information and strive to build a strong and supportive community dedicated to cybersecurity.

User Menu

Follow us

Follow us on Facebook or Twitter to know first about the latest cybersecurity incidents and malware threats.

Top